<div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/A_bit_more_on_privacy_respecting_health_monitor___fitness_tracker.html">A bit more on privacy respecting health monitor / fitness tracker</a></div>
- <div class="date">13th August 2018</div>
- <div class="body"><p>A few days ago, I wondered if there are any privacy respecting
-health monitors and/or fitness trackers available for sale these days.
-I would like to buy one, but do not want to share my personal data
-with strangers, nor be forced to have a mobile phone to get data out
-of the unit. I've received some ideas, and would like to share them
-with you.
-
-One interesting data point was a pointer to a Free Software app for
-Android named
-<a href="https://github.com/Freeyourgadget/Gadgetbridge/">Gadgetbridge</a>.
-It provide cloudless collection and storing of data from a variety of
-trackers. Its
-<a href="https://github.com/Freeyourgadget/Gadgetbridge/#supported-devices">list
-of supported devices</a> is a good indicator for units where the
-protocol is fairly open, as it is obviously being handled by Free
-Software. Other units are reportedly encrypting the collected
-information with their own public key, making sure only the vendor
-cloud service is able to extract data from the unit. The people
-contacting me about Gadgetbirde said they were using
-<a href="https://us.amazfit.com/shop/bip?variant=336750">Amazfit
-Bip</a> and
-<a href="http://www.xiaomimi6phone.com/xiaomi-mi-band-3-features-release-date-rumors/">Xiaomi
-Band 3</a>.</p>
-
-<p>I also got a suggestion to look at some of the units from Garmin.
-I was told their GPS watches can be connected via USB and show up as a
-USB storage device with
-<a href="https://www.gpsbabel.org/htmldoc-development/fmt_garmin_fit.html">Garmin
-FIT files</a> containing the collected measurements. While
-proprietary, FIT files apparently can be read at least by
-<a href="https://www.gpsbabel.org">GPSBabel</a> and the
-<a href="https://apps.nextcloud.com/apps/gpxpod">GpxPod</a> Nextcloud
-app. It is unclear to me if they can read step count and heart rate
-data. The person I talked to was using a
-<a href="https://buy.garmin.com/en-US/US/p/564291">Garmin Forerunner
-935</a>, which is a fairly expensive unit. I doubt it is worth it for
-a unit where the vendor clearly is trying its best to move from open
-to closed systems. I still remember when Garmin dropped NMEA support
-in its GPSes.</p>
-
-<p>A final idea was to build ones own unit, perhaps by basing it on a
-wearable hardware platforms like
-<a href="https://learn.adafruit.com/flora-geo-watch">the Flora Geo
-Watch</a>. Sound like fun, but I had more money than time to spend on
-the topic, so I suspect it will have to wait for another time.</p>
-
-<p>While I was working on tracking down links, I came across an
-inspiring TED talk by Dave Debronkart about
-<a href="https://archive.org/details/DavedeBronkart_2010X">being a
-e-patient</a>, and discovered the web site
-<a href="https://participatorymedicine.org/epatients/">Participatory
-Medicine</a>. If you too want to track your own health and fitness
-without having information about your private life floating around on
-computers owned by others, I recommend checking it out.</p>
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Oppdaterte_kommentarer_til__Evaluation_of__il_legality__for_Popcorn_Time.html">Oppdaterte kommentarer til «Evaluation of (il)legality» for Popcorn Time</a></div>
+ <div class="date">16th January 2019</div>
+ <div class="body"><p>I forrige uke var jeg i Borgarting lagmannsrett som partshjelper og
+ sakkyndig vitne og presenterte mine oppdaterte undersøkelser rundt
+ <a href="https://github.com/petterreinholdtsen/public-domain-free-imdb">telling
+ av filmverk i det fri</a>, relatert til
+ <a href="https://www.nuug.no/">foreningen NUUG</a>s involvering i <a
+ href="https://www.nuug.no/news/tags/dns-domenebeslag/">saken om
+ Økokrims beslag og senere inndragning av DNS-domenet
+ popcorn-time.no</a>. I forkant hadde jeg oppdatert mitt notat med
+ kommentarer til et av aktors bevis, som forsøkte å måle hvor stor
+ andel ulovligheter som var tilgjengelig via Popcorn Time-avspillere.
+ Jeg mistenker flere kan ha glede av å lese dette notatet, som jeg
+ publiserte en tidligere versjon av i fjor, så her er det. Legger
+ også ved avskrift av dokument 09,13, som er det sentrale dokumentet
+ jeg kommenterer.</p>
+
+<p><strong>Oppdaterte kommentarer til «Evaluation of (il)legality» for
+Popcorn Time</strong></p>
+
+<p><strong>Oppsummering</strong></p>
+
+<p>Målemetoden som Økokrim har lagt til grunn når de påstår at 99% av
+ filmene tilgjengelig fra Popcorn Time deles ulovlig har svakheter
+ som gjør resultatet upålitelig.</p>
+
+<p>De eller den som har vurdert hvorvidt filmer kan lovlig deles er
+ ikke i stand til å identifisere filmer som kan deles lovlig eller er
+ falt i det fri og har tilsynelatende antatt at kun veldig gamle
+ filmer kan deles lovlig. Økokrim legger til grunn at det bare finnes
+ èn film, Charlie Chaplin-filmen «The Circus» fra 1928, som kan deles
+ fritt blant de som ble observert tilgjengelig via ulike Popcorn
+ Time-varianter. Med min begrensede og ufullstendige oversikt finner
+ jeg tre flere blant de observerte filmene: «The Brain That Wouldn't
+ Die» fra 1962, «God’s Little Acre» fra 1958 og «She Wore a Yellow
+ Ribbon» fra 1949. Det er godt mulig det finnes flere. Det finnes
+ dermed minst fire ganger så mange filmer som lovlig kan deles på
+ Internett i datasettet Økokrim har lagt til grunn når det påstås at
+ mindre enn 1 % kan deles lovlig.</p>
+
+<p>Dernest, utplukket som gjøres ved søk på tilfeldige ord hentet fra
+ ordlisten til Dale-Chall avviker fra årsfordelingen til de brukte
+ filmkatalogene som helhet, hvilket påvirker fordelingen mellom
+ filmer som kan lovlig deles og filmer som ikke kan lovlig deles. I
+ tillegg gir valg av øvre del (de fem første) av søkeresultatene et
+ avvik fra riktig årsfordeling, hvilket påvirker fordelingen av verk
+ i det fri i søkeresultatet.</p>
+
+<p>Til sist er det viktig å merke seg at det som måles er ikke
+ (u)lovligheten knyttet til <strong>bruken</strong> av Popcorn Time,
+ men (u)lovligheten til innholdet i ulike bittorrent-filmkataloger
+ som vedlikeholdes av ulike miljøer uavhengig av Popcorn Time, og som
+ ulike Popcorn Time-varianter har benyttet seg av.</p>
+
+<p>Omtalte dokumenter: 09,12, <a href="#dok-09-13">09,13</a>, 09,14,
+ 09,18, 09,19, 09,20.</p>
+
+<p><strong>Utfyllende kommentarer</strong></p>
+
+<p>Økokrim har forklart domstolene at minst 99% av alt som er
+ tilgjengelig fra ulike Popcorn Time-varianter deles ulovlig på
+ Internet. Jeg ble nysgjerrig på hvordan de er kommet frem til dette
+ tallet, og dette notatet er en samling kommentarer rundt målingen
+ Økokrim henviser til. Litt av bakgrunnen for at jeg valgte å se på
+ saken er at jeg er interessert i å identifisere og telle hvor mange
+ kunstneriske verk som er falt i det fri eller av andre grunner kan
+ lovlig deles på Internett, og dermed var interessert i hvordan en
+ hadde funnet den ene prosenten som kanskje deles lovlig.</p>
+
+<p>Andelen på 99% kommer fra et ukreditert og udatert notatet som tar
+ mål av seg å dokumentere en metode for å måle hvor (u)lovlig ulike
+ Popcorn Time-varianter er.</p>
+
+<p>Raskt oppsummert, så forteller metodedokumentet at fordi det ikke
+ er mulig å få tak i komplett liste over alle filmtitler tilgjengelig
+ via Popcorn Time, så lages noe som skal være et representativt
+ utvalg ved å velge 50 tilfeldige søkeord større enn tre tegn fra en
+ ordliste kjent som Dale-Chall. For hvert søkeord gjøres et søk og de
+ første fem filmene i søkeresultatet samles inn inntil 100 unike
+ filmtitler er funnet. Hvis 50 søkeord ikke var tilstrekkelig for å
+ nå 100 unike filmtitler ble flere filmer fra hvert søkeresultat lagt
+ til. Hvis dette heller ikke var tilstrekkelig, så ble det hentet ut
+ og søkt på flere tilfeldig valgte søkeord inntil 100 unike
+ filmtitler var identifisert.</p>
+
+<p>Deretter ble for hver av filmtitlene «vurdert hvorvidt det var
+ rimelig å forvente om at verket var vernet av copyright, ved å se på
+ om filmen var tilgjengelig i IMDB, samt se på regissør,
+ utgivelsesår, når det var utgitt for bestemte markedsområder samt
+ hvilke produksjons- og distribusjonsselskap som var registrert» (min
+ oversettelse).</p>
+
+<p>Metoden er gjengitt både i de ukrediterte dokumentene 09,13 og
+ 09,19, samt beskrevet fra side 47 i dokument 09,20, lysark datert
+ 2017-02-01. Sistnevnte er kreditert Geerart Bourlon fra Motion
+ Picture Association EMEA.</p>
+
+<p>Metoden virker å ha flere svakheter som gir resultatene en
+ slagside. Den starter med å slå fast at det ikke er mulig å hente ut
+ en komplett liste over alle filmtitler som er tilgjengelig, og at
+ dette er bakgrunnen for metodevalget. Denne forutsetningen er ikke i
+ tråd med det som står i dokument 09,12, som ikke heller har oppgitt
+ forfatter og dato. Dokument 09,12 forteller hvordan hele
+ kataloginnholdet i en bittorrent-katalog ble lasted ned og talt
+ opp. Dokument 09,12 er muligens samme rapport som det ble referert
+ til i dom fra Oslo Tingrett 2017-11-03
+ (<a href="https://www.domstol.no/no/Enkelt-domstol/Oslo--tingrett/Nyheter/ma-sperre-for-popcorn-time/">sak
+ 17-093347TVI-OTIR/05</a>) under navnet rapport av 1. juni 2017 av
+ Alexander Kind Petersen. De ligner, men jeg har ikke sammenlignet
+ dokumentene ord for ord for å kontrollere om de er identiske.</p>
+
+<p>Det finnes flere kilder som kan brukes til å finne filmer som er
+ allemannseie (public domain) eller har bruksvilkår som gjør det
+ lovlig for alle å dele dem på Internett. Jeg har det siste året
+ forsøkt å samle og krysskoble disse listene ved hjelp av tittel-ID i
+ IMDB for å forsøke å telle antall filmer i det fri. Ved å ta
+ utgangspunkt i slike lister (og publiserte filmer for
+ Internett-arkivets del), har jeg så langt klart å identifisere over
+ 14 000 filmer, hovedsaklig spillefilmer. Noen filmer er gått tapt
+ ved at de eneste kjente eksemplarene er blitt ødelagt. Jeg har ikke
+ forsøkt å finne ut hvilke filmer som er gått tapt, ut over å se
+ hvilke filmer som er tilgjengelig på filmdelings-nettsteder.</p>
+
+<p>IMDB er en forkortelse for The Internet Movie Database, en
+ anerkjent kommersiell nettjeneste som brukes aktivt av både
+ filmbransjen og andre til å holde rede på hvilke spillefilmer (og
+ endel andre filmer) som finnes eller er under produksjon, samt
+ informasjon om disse filmene. Datakvaliteten er høy, med få feil og
+ få filmer som mangler. IMDB viser ikke informasjon om
+ opphavsrettslig status for filmene på infosiden for hver film, men
+ frivillige har lagt ut på IMDB-tjenesten lister med filmer som antas
+ å være verk i det fri. Disse listene er en liten del av kildene for
+ min telling av verk som kan lovlig deles på Internett.</p>
+
+<p>De aller fleste oppføringene over verk i det fri er hentet fra IMDB
+ selv, basert på det faktum at alle filmer laget i USA før 1923 er
+ falt i det fri. Tilsvarende tidsgrense for Storbritannia er
+ 1912-07-01, men dette utgjør bare veldig liten del av spillefilmene
+ i IMDB (19 totalt). En annen stor andel kommer fra
+ Internett-arkivet, der jeg har identifisert filmer som har referanse
+ til IMDB. Internett-arkivet, som holder til i USA, har
+ som <a href="https://archive.org/about/terms.php">policy å kun
+ publisere filmer som det er lovlig å distribuere</a>. Jeg har under
+ arbeidet kommet over flere filmer som har blitt fjernet fra
+ Internett-arkivet, hvilket gjør at jeg konkluderer med at folkene
+ som kontrollerer Internett-arkivet har et aktivt forhold til kun å
+ ha lovlig innhold der, selv om det i stor grad er drevet av
+ frivillige. Internett-arkivet har publisert 4.6 millioner
+ videofilmer som samtlige er tilgjengelig også med
+ Bittorrent-protokollen. En annen stor liste med filmer kommer fra
+ det kommersielle selskapet Retro Film Vault, som selger
+ allemannseide filmer til TV- og filmbransjen, Jeg har også benyttet
+ meg av lister over filmer som hevdes å være allemannseie, det være
+ seg Public Domain Review, Public Domain Torrents og Public Domain
+ Movies (to ulike tjenester med samme navn, på .net og .info), samt
+ lister over filmer med Creative Commons-lisensiering fra Wikipedia,
+ VODO og The Hill Productions. Jeg har gjort endel stikkontroll ved å
+ vurdere filmer som kun omtales på en liste. Der jeg har funnet feil
+ som har gjort meg i tvil om vurderingen til de som har laget listen
+ har jeg forkastet listen fullstendig (gjelder for eksemel en av
+ listene fra IMDB).</p>
+
+<p>Ved å ta utgangspunkt i verk som kan antas å være lovlig delt på
+ Internett (fra blant annet Internett-arkivet, Public Domain
+ Torrents, Public Domain Reivew og Public Domain Movies), og knytte
+ dem til oppføringer i IMDB, så har jeg så langt klart å identifisere
+ over 14 000 filmer (hovedsaklig spillefilmer) det er grunn til å tro
+ kan lovlig distribueres av alle på Internett. Som ekstra kilder er
+ det brukt lister over filmer som antas/påstås å være
+ allemannseie. Disse kildene kommer fra miljøer som jobber for å
+ gjøre tilgjengelig for almennheten alle verk som er falt i det fri
+ eller har bruksvilkår som tillater deling.</p>
+
+<p>I tillegg til de over 14 000 filmene der tittel-ID i IMDB er
+ identifisert, har jeg funnet mer enn 26 000 oppføringer der jeg ennå
+ ikke har hatt kapasitet til å spore opp tittel-ID i IMDB. Jeg har
+ sett at noen av disse er duplikater av de IMDB-oppføringene som er
+ identifisert så langt, men de fleste jeg har hatt tid til å
+ undersøke så langt har vist seg å ikke være duplikater. Retro Film
+ Vault hevder å ha 44 000 filmverk i det fri i sin katalog, så det er
+ mulig at det reelle tallet er betydelig høyere enn de jeg har klart
+ å identifisere så langt. Konklusjonen en kan trekke fra dette er at
+ tallet 14 000 er nedre grense for hvor mange filmer i IMDB som kan
+ lovlig deles på Internett. I
+ følge <a href="https://www.imdb.com/stats">statistikk fra IMDB</a>
+ er det 4.6 millioner titler registrert, hvorav 3 millioner er
+ TV-serieepisoder.</p>
+
+<p>Hvis en fordeler på år alle tittel-IDene i IMDB som hevdes å deles
+ lovlig på Internett, får en følgende histogram:</p>
+
+<p align="center"><img src="http://people.skolelinux.org/pere/blog/images/2019-01-16-dns-beslag-verkidetfri-2018-11-26-histogram-year.png"
+ alt="histogram over frie filmer per år" width="80%"/></p>
+
+<p>En kan i histogrammet se at effekten av manglende registrering
+ eller fornying av registrering er at mange filmer gitt ut i USA før
+ 1978 er allemannseie i dag. I tillegg kan en se at det finnes flere
+ filmer gitt ut de siste årene med bruksvilkår som tillater deling,
+ muligens på grunn av fremveksten
+ av <a href="https://creativecommons.org/">Creative
+ Commons</a>-bevegelsen.</p>
+
+<p>IMDB har lagt ut <a href="https://www.imdb.com/interfaces/">en
+ maskinlesbare liste</a> over alle registreringene i sin database, og
+ ved hjelp av denne har jeg oppsummert antall titler per år i
+ kategoriene «movies» og «short», som er det jeg fokuserer på i min
+ telling. Inn i oversikten er det tegnet hvor stor prosentandel
+ antallet filmer som hevdes å kunne deles lovlig på Internett utgjør
+ av IMDB-totalen. Ut fra oversikten får man en ide om hvor stor andel
+ av totalen som kan mangle i min telling, for eksempel ved å merke
+ seg at få prosenter av filmene utgitt tidlig på 1900-tallet er med i
+ min telling.</p>
+
+<p align="center"><img src="http://people.skolelinux.org/pere/blog/images/2019-01-16-dns-beslag-verkidetfri-2018-11-26-histogram-year-imdb.png"
+ alt="histogram over filmer og frie filmer per år" width="80%" /></p>
+
+<p>For maskinell analyse av katalogene laget jeg et lite program som
+ kobler seg til bittorrent-katalogene som brukes av ulike Popcorn
+ Time-varianter og laster ned komplett liste over filmer i
+ katalogene. Dette bekrefter at det er mulig å hente ut komplett
+ liste med alle filmtitler som er tilgjengelig i katalogene, i strid
+ med påstanden i dokumentene 09,13, 09,19 og 09,20. Jeg har sett på
+ fire bittorrent-kataloger. Den ene ble brukt av klienten
+ tilgjengelig fra www.popcorntime.sh 2017-12-18 og er navngitt «sh» i
+ dette dokumentet. Den andre brukes i følge dokument 09,12 av
+ klienten tilgjengelig fra popcorntime.ag og popcorntime.sh på ukjent
+ tidspunkt og er navngitt «yts» i dette dokumentet. Den tredje ble
+ brukt av websidene tilgjengelig fra popcorntime-online.tv 2017-12-18
+ og er navngitt «apidomain» i dette dokumentet. Den fjerde ble brukt
+ av klienten tilgjengelig fra popcorn-time.to i følge dokument 09,12
+ på ukjent tidspunkt, og er navngitt «ukrfnlge» i dette
+ dokumentet. Hvilke kataloger som brukes av ulike Popcorn
+ Time-klienter endrer seg over tid, da Popcorn Time-klientene i
+ praksis er nettlesere som viser frem ulike nettsider og disse
+ nettsidene bytter datakilder når nettsidens eier ønsker det.</p>
+
+<p>Metoden som Økokrim legger til grunn, skriver i sitt punkt fire at
+ skjønn er en egnet metode for å finne ut om en film kan lovlig deles
+ på Internett eller ikke, og sier at det ble «vurdert hvorvidt det
+ var rimelig å forvente om at verket var vernet av copyright». For
+ det første er det ikke nok å slå fast om en film er «vernet av
+ copyright» for å vite om det er lovlig å dele den på Internett eller
+ ikke, da det finnes flere filmer med opphavsrettslige bruksvilkår
+ som tillater deling på Internett. Eksempler på dette er Creative
+ Commons-lisensierte filmer som Citizenfour fra 2014 og Sintel fra
+ 2010. I tillegg til slike finnes det flere filmer som nå er
+ allemannseie (public domain) på grunn av manglende registrering
+ eller fornying av registrering selv om både regisør,
+ produksjonsselskap og distributør ønsker seg vern. Eksempler på
+ dette er Plan 9 from Outer Space fra 1959 og Night of the Living
+ Dead fra 1968. Alle filmer fra USA som var allemannseie før
+ 1989-03-01 forble i det fri da Bern-konvensjonen, som tok effekt i
+ USA på det tidspunktet, ikke ble gitt tilbakevirkende
+ kraft. <a href="https://www.latimes.com/local/lanow/la-me-ln-happy-birthday-song-lawsuit-decision-20150922-story.html">Historien
+ om sangen «Happy birthday»</a>, der betaling for bruk har vært krevd
+ inn i flere tiår selv om sangen ikke var vernet av åndsverksloven,
+ forteller oss at hvert enkelt verk må vurderes nøye og i detalj før
+ en kan slå fast om verket er allemannseie eller ikke, det holder
+ ikke å tro på selverklærte rettighetshavere. Flere eksempel på verk
+ i det fri som feilklassifiseres som vernet er fra dokument 09,18,
+ som lister opp søkeresultater for pklienten omtalt som
+ popcorntime.sh og i følge notatet kun inneholder en film (The Circus
+ fra 1928) som under tvil kan antas å være allemannseie.</p>
+
+<p>Ved rask gjennomlesning av dokument 09,18, som inneholder
+ skjermbilder fra bruk av en Popcorn Time-variant, fant jeg omtalt
+ både filmen «The Brain That Wouldn't Die» fra 1962 som
+ er <a href="https://archive.org/details/brain_that_wouldnt_die">tilgjengelig
+ fra Internett-arkivet</a> og
+ som <a href="https://en.wikipedia.org/wiki/List_of_films_in_the_public_domain_in_the_United_States">i
+ følge Wikipedia er allemannseie i USA</a> da den ble gitt ut i 1962
+ uten «copyright»-merking, og filmen «God’s Little Acre» fra
+ 1958 <a href="https://en.wikipedia.org/wiki/God%27s_Little_Acre_%28film%29">som
+ er lagt ut på Wikipedia</a>, der det fortelles at sort/hvit-utgaven
+ er allemannseie. Det fremgår ikke fra dokument 09,18 om filmen
+ omtalt der er sort/hvit-utgaven. Av kapasitetsårsaker og på grunn av
+ at filmoversikten i dokument 09,18 ikke er maskinlesbart har jeg
+ ikke forsøkt å sjekke alle filmene som listes opp der om mot liste
+ med filmer som er antatt lovlig kan distribueres på Internet.</p>
+
+<p>Ved maskinell gjennomgang av listen med IMDB-referanser under
+ regnearkfanen «Unique titles» i dokument 09.14, fant jeg i tillegg
+ filmen «She Wore a Yellow Ribbon» fra 1949) som nok også er
+ feilklassifisert. Filmen «She Wore a Yellow Ribbon» er tilgjengelig
+ fra Internett-arkivet og markert som allemannseie der. Det virker
+ dermed å være minst fire ganger så mange filmer som kan lovlig deles
+ på Internett enn det som er lagt til grunn når en påstår at minst
+ 99% av innholdet er ulovlig. Jeg ser ikke bort fra at nærmere
+ undersøkelser kan avdekke flere. Poenget er uansett ikke hvor mange
+ filmer i listen som er lovlig å dele på Internet, men at metodens
+ punkt med vurdering av «rimelig å forvente om at verket var vernet
+ av copyright» gjør metoden upålitelig.</p>
+
+<p>Den omtalte målemetoden velger ut tilfeldige søketermer fra
+ ordlisten Dale-Chall. Den ordlisten inneholder 3000 enkle engelske
+ ord som fjerdeklassinger i USA er forventet å forstå. Det fremgår
+ ikke hvorfor akkurat denne ordlisten er valgt, og det er uklart for
+ meg om den er egnet til å få et representativt utvalg av
+ filmer. Mange av ordene gir tomt søkeresultat. Ved å simulerte
+ tilsvarende søk ser jeg store avvik fra fordelingen i katalogen for
+ enkeltmålinger. Dette antyder at enkeltmålinger av 100 filmer slik
+ målemetoden beskriver er gjort, ikke er velegnet til å finne andel
+ ulovlig innhold i bittorrent-katalogene.</p>
+
+<p>En kan motvirke dette store avviket for enkeltmålinger ved å gjøre
+ mange søk og slå sammen resultatet. Jeg har testet ved å gjennomføre
+ 100 enkeltmålinger (dvs. måling av (100x100=) 10 000 tilfeldig
+ valgte filmer) som gir mindre, men fortsatt betydelig avvik, i
+ forhold til telling av filmer pr år i hele katalogen.</p>
+
+<p>Målemetoden henter ut de fem øverste i
+ søkeresultatet. Søkeresultatene er sortert på antall
+ bittorrent-klienter registrert som delere i katalogene, hvilket kan
+ gi en slagside mot hvilke filmer som er populære blant de som bruker
+ bittorrent-katalogene, uten at det forteller noe om hvilket innhold
+ som er tilgjengelig eller hvilket innhold som deles med Popcorn
+ Time-klienter. Jeg har forsøkt å måle hvor stor en slik slagside
+ eventuelt er ved å sammenligne fordelingen hvis en tar de 5 nederste
+ i søkeresultatet i stedet. Avviket for disse to metodene for flere
+ av katalogene er godt synlig på histogramet. Her er histogram over
+ filmer funnet i den komplette katalogen (grønn strek), og filmer
+ funnet ved søk etter ord i Dale-Chall. Grafer merket «top» henter
+ fra de 5 første i søkeresultatet, mens de merket «bottom» henter fra
+ de 5 siste. En kan her se at resultatene påvirkes betydelig av
+ hvorvidt en ser på de første eller de siste filmene i et
+ søketreff.</p>
+
+<p align="center">
+ <img src="http://people.skolelinux.org/pere/blog/images/2017-12-20-histogram-year-sh-top.png" width="40%" />
+ <img src="http://people.skolelinux.org/pere/blog/images/2017-12-20-histogram-year-sh-bottom.png" width="40%" />
+ <br/>
+ <img src="http://people.skolelinux.org/pere/blog/images/2017-12-20-histogram-year-yts-top.png" width="40%" />
+ <img src="http://people.skolelinux.org/pere/blog/images/2017-12-20-histogram-year-yts-bottom.png" width="40%" />
+ <br/>
+ <img src="http://people.skolelinux.org/pere/blog/images/2017-12-20-histogram-year-ukrfnlge-top.png" width="40%" />
+ <img src="http://people.skolelinux.org/pere/blog/images/2017-12-20-histogram-year-ukrfnlge-bottom.png" width="40%" />
+ <br/>
+ <img src="http://people.skolelinux.org/pere/blog/images/2017-12-20-histogram-year-apidomain-top.png" width="40%" />
+ <img src="http://people.skolelinux.org/pere/blog/images/2017-12-20-histogram-year-apidomain-bottom.png" width="40%" />
+</p>
-<p>As usual, if you use Bitcoin and want to show your support of my
-activities, please send Bitcoin donations to my address
-<b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
+<p>Det er viktig å merke seg at de omtalte bittorrent-katalogene ikke
+ er laget for bruk med Popcorn Time, men for ulike miljøer av
+ bittorrent-brukere. Eksempelvis tilhører katalogen YTS, som brukes
+ av klientet som ble lastes ned fra popcorntime.sh, et selvstendig
+ fildelings-relatert nettsted YTS.AG med et separat
+ brukermiljø. Målemetoden foreslått av Økokrim måler dermed ikke
+ (u)lovligheten rundt bruken av Popcorn Time, men (u)lovligheten til
+ innholdet i disse katalogene.</p>
+
+<hr/>
+
+<p id="dok-09-13">Metoden fra Økokrims dokument 09,13 i straffesaken
+ om DNS-beslag.</p>
+
+<blockquote>
+
+<p><strong>1. Evaluation of (il)legality</strong></p>
+
+<p><strong>1.1. Methodology</strong>
+
+<p>Due to its technical configuration, Popcorn Time applications don't
+allow to make a full list of all titles made available. In order to
+evaluate the level of illegal operation of PCT, the following
+methodology was applied:</p>
+
+<ol>
+
+ <li>A random selection of 50 keywords, greater than 3 letters, was
+ made from the Dale-Chall list that contains 3000 simple English
+ words1. The selection was made by using a Random Number
+ Generator2.</li>
+
+ <li>For each keyword, starting with the first randomly selected
+ keyword, a search query was conducted in the movie section of the
+ respective Popcorn Time application. For each keyword, the first
+ five results were added to the title list until the number of 100
+ unique titles was reached (duplicates were removed).</li>
+
+ <li>For one fork, .CH, insufficient titles were generated via this
+ approach to reach 100 titles. This was solved by adding any
+ additional query results above five for each of the 50 keywords.
+ Since this still was not enough, another 42 random keywords were
+ selected to finally reach 100 titles.</li>
+
+ <li>It was verified whether or not there is a reasonable expectation
+ that the work is copyrighted by checking if they are available on
+ IMDb, also verifying the director, the year when the title was
+ released, the release date for a certain market, the production
+ company/ies of the title and the distribution company/ies.</li>
+
+</ol>
+
+<p><strong>1.2. Results</strong></p>
+
+<p>Between 6 and 9 June 2016, four forks of Popcorn Time were
+investigated: popcorn-time.to, popcorntime.ag, popcorntime.sh and
+popcorntime.ch. An excel sheet with the results is included in
+Appendix 1. Screenshots were secured in separate Appendixes for each
+respective fork, see Appendix 2-5.</p>
+
+<p>For each fork, out of 100, de-duplicated titles it was possible to
+retrieve data according to the parameters set out above that indicate
+that the title is commercially available. Per fork, there was 1 title
+that presumably falls within the public domain, i.e. the 1928 movie
+"The Circus" by and with Charles Chaplin.</p>
+
+<p>Based on the above it is reasonable to assume that 99% of the movie
+content of each fork is copyright protected and is made available
+illegally.</p>
+
+<p>This exercise was not repeated for TV series, but considering that
+besides production companies and distribution companies also
+broadcasters may have relevant rights, it is reasonable to assume that
+at least a similar level of infringement will be established.</p>
+
+<p>Based on the above it is reasonable to assume that 99% of all the
+content of each fork is copyright protected and are made available
+illegally.</p>
+
+</blockquote>
+
+<p>Som vanlig, hvis du bruker Bitcoin og ønsker å vise din støtte til
+det jeg driver med, setter jeg pris på om du sender Bitcoin-donasjoner
+til min adresse
+<b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.
+Merk, betaling med bitcoin er ikke anonymt. :)</p>
</div>
<div class="tags">
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling</a>, <a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture</a>, <a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>, <a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett</a>, <a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
</div>
<div class="padding"></div>
<div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/Privacy_respecting_health_monitor___fitness_tracker_.html">Privacy respecting health monitor / fitness tracker?</a></div>
- <div class="date"> 7th August 2018</div>
- <div class="body"><p>Dear lazyweb,</p>
-
-<p>I wonder, is there a fitness tracker / health monitor available for
-sale today that respect the users privacy? With this I mean a
-watch/bracelet capable of measuring pulse rate and other
-fitness/health related values (and by all means, also the correct time
-and location if possible), which is <strong>only</strong> provided for
-me to extract/read from the unit with computer without a radio beacon
-and Internet connection. In other words, it do not depend on a cell
-phone app, and do make the measurements available via other peoples
-computer (aka "the cloud"). The collected data should be available
-using only free software. I'm not interested in depending on some
-non-free software that will leave me high and dry some time in the
-future. I've been unable to find any such unit. I would like to buy
-it. The ones I have seen for sale here in Norway are proud to report
-that they share my health data with strangers (aka "cloud enabled").
-Is there an alternative? I'm not interested in giving money to people
-requiring me to accept "privacy terms" to allow myself to measure my
-own health.</p>
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/CasparCG_Server_for_TV_broadcast_playout_in_Debian.html">CasparCG Server for TV broadcast playout in Debian</a></div>
+ <div class="date">15th January 2019</div>
+ <div class="body"><p>The layered video playout server created by Sveriges Television,
+<a href="https://casparcg.com/">CasparCG Server</a>, entered Debian
+today. This completes many months of work to get the source ready to
+go into Debian. The first upload to the Debian NEW queue happened a
+month ago, but the work upstream to prepare it for Debian started more
+than two and a half month ago. So far
+<a href="https://tracker.debian.org/pkg/casparcg-server">the
+casparcg-server package</a> is only available for amd64, but I hope
+this can be improved. The package is in contrib because it depend on
+the <a href="https://tracker.debian.org/pkg/fdk-aac">non-free fdk-aac
+library</a>. The Debian package lack support for streaming web pages
+because Debian is missing CEF, Chromium Embedded Framework. CEF is
+wanted by several packages in Debian. But because the Chromium source
+is <a href="https://bugs.debian.org/893448">not available as a build
+dependency</a>, it is not yet possible to upload CEF to Debian. I
+hope this will change in the future.</p>
+
+<p>The reason I got involved is that
+<a href="https://frikanalen.no/">the Norwegian open channel
+Frikanalen</a> is starting to use CasparCG for our HD playout, and I
+would like to have all the free software tools we use to run the TV
+channel available as packages from the Debian project. The last
+remaining piece in the puzzle is Open Broadcast Encoder, but it depend
+on quite a lot of patched libraries which would have to be included in
+Debian first.</p>
<p>As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
<div class="tags">
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen</a>, <a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
</div>
<div class="padding"></div>
<div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/Sharing_images_with_friends_and_family_using_RSS_and_EXIF_XMP_metadata.html">Sharing images with friends and family using RSS and EXIF/XMP metadata</a></div>
- <div class="date">31st July 2018</div>
- <div class="body"><p>For a while now, I have looked for a sensible way to share images
-with my family using a self hosted solution, as it is unacceptable to
-place images from my personal life under the control of strangers
-working for data hoarders like Google or Dropbox. The last few days I
-have drafted an approach that might work out, and I would like to
-share it with you. I would like to publish images on a server under
-my control, and point some Internet connected display units using some
-free and open standard to the images I published. As my primary
-language is not limited to ASCII, I need to store metadata using
-UTF-8. Many years ago, I hoped to find a digital photo frame capable
-of reading a RSS feed with image references (aka using the
-<enclosure> RSS tag), but was unable to find a current supplier
-of such frames. In the end I gave up that approach.</p>
-
-<p>Some months ago, I discovered that
-<a href="https://www.jwz.org/xscreensaver/">XScreensaver</a> is able to
-read images from a RSS feed, and used it to set up a screen saver on
-my home info screen, showing images from the Daily images feed from
-NASA. This proved to work well. More recently I discovered that
-<a href="https://kodi.tv">Kodi</a> (both using
-<a href="https://www.openelec.tv/">OpenELEC</a> and
-<a href="https://libreelec.tv">LibreELEC</a>) provide the
-<a href="https://github.com/grinsted/script.screensaver.feedreader">Feedreader</a>
-screen saver capable of reading a RSS feed with images and news. For
-fun, I used it this summer to test Kodi on my parents TV by hooking up
-a Raspberry PI unit with LibreELEC, and wanted to provide them with a
-screen saver showing selected pictures from my selection.</p>
-
-<p>Armed with motivation and a test photo frame, I set out to generate
-a RSS feed for the Kodi instance. I adjusted my <a
-href="https://freedombox.org/">Freedombox</a> instance, created
-/var/www/html/privatepictures/, wrote a small Perl script to extract
-title and description metadata from the photo files and generate the
-RSS file. I ended up using Perl instead of python, as the
-libimage-exiftool-perl Debian package seemed to handle the EXIF/XMP
-tags I ended up using, while python3-exif did not. The relevant EXIF
-tags only support ASCII, so I had to find better alternatives. XMP
-seem to have the support I need.</p>
-
-<p>I am a bit unsure which EXIF/XMP tags to use, as I would like to
-use tags that can be easily added/updated using normal free software
-photo managing software. I ended up using the tags set using this
-exiftool command, as these tags can also be set using digiKam:</p>
-
-<blockquote><pre>
-exiftool -headline='The RSS image title' \
- -description='The RSS image description.' \
- -subject+=for-family photo.jpeg
-</pre></blockquote>
-
-<p>I initially tried the "-title" and "keyword" tags, but they were
-invisible in digiKam, so I changed to "-headline" and "-subject". I
-use the keyword/subject 'for-family' to flag that the photo should be
-shared with my family. Images with this keyword set are located and
-copied into my Freedombox for the RSS generating script to find.</p>
-
-<p>Are there better ways to do this? Get in touch if you have better
-suggestions.</p>
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Learn_to_program_with_Minetest_on_Debian.html">Learn to program with Minetest on Debian</a></div>
+ <div class="date">15th December 2018</div>
+ <div class="body"><p>A fun way to learn how to program
+<a href="https://www.python.org/">Python</a> is to follow the
+instructions in the book
+"<a href="https://nostarch.com/programwithminecraft">Learn to program
+with Minecraft</a>", which introduces programming in Python to people
+who like to play with Minecraft. The book uses a Python library to
+talk to a TCP/IP socket with an API accepting build instructions and
+providing information about the current players in a Minecraft world.
+The TCP/IP API was first created for the Minecraft implementation for
+Raspberry Pi, and has since been ported to some server versions of
+Minecraft. The book contain recipes for those using Windows, MacOSX
+and Raspian. But a little known fact is that you can follow the same
+recipes using the free software construction game
+<a href="https://minetest.net/">Minetest</a>.</p>
+
+<p>There is <a href="https://github.com/sprintingkiwi/pycraft_mod">a
+Minetest module implementing the same API</a>, making it possible to
+use the Python programs coded to talk to Minecraft with Minetest too.
+I
+<a href="https://ftp-master.debian.org/new/minetest-mod-pycraft_0.20%2Bgit20180331.0376a0a%2Bdfsg-1.html">uploaded
+this module</a> to Debian two weeks ago, and as soon as it clears the
+FTP masters NEW queue, learning to program Python with Minetest on
+Debian will be a simple 'apt install' away. The Debian package is
+maintained as part of the Debian Games team, and
+<a href="https://salsa.debian.org/games-team/unfinished/minetest-mod-pycraft">the
+packaging rules</a> are currently located under 'unfinished' on
+Salsa.</p>
+
+<p>You will most likely need to install several of the Minetest
+modules in Debian for the examples included with the library to work
+well, as there are several blocks used by the example scripts that are
+provided via modules in Minetest. Without the required blocks, a
+simple stone block is used instead. My initial testing with a analog
+clock did not get gold arms as instructed in the python library, but
+instead used stone arms.</p>
+
+<p>I tried to find a way to add the API to the desktop version of
+Minecraft, but were unable to find any working recipes. The
+<a href="https://www.epiphanydigest.com/tag/minecraft-python-api/">recipes</a>
+I <a href="https://github.com/kbsriram/mcpiapi">found</a> are only
+working with a standalone Minecraft server setup. Are there any
+options to use with the normal desktop version?</p>
<p>As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
<div class="padding"></div>
<div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/Simple_streaming_the_Linux_desktop_to_Kodi_using_GStreamer_and_RTP.html">Simple streaming the Linux desktop to Kodi using GStreamer and RTP</a></div>
- <div class="date">12th July 2018</div>
- <div class="body"><p>Last night, I wrote
-<a href="http://people.skolelinux.org/pere/blog/Streaming_the_Linux_desktop_to_Kodi_using_VLC_and_RTSP.html">a
-recipe to stream a Linux desktop using VLC to a instance of Kodi</a>.
-During the day I received valuable feedback, and thanks to the
-suggestions I have been able to rewrite the recipe into a much simpler
-approach requiring no setup at all. It is a single script that take
-care of it all.</p>
-
-<p>This new script uses GStreamer instead of VLC to capture the
-desktop and stream it to Kodi. This fixed the video quality issue I
-saw initially. It further removes the need to add a m3u file on the
-Kodi machine, as it instead connects to
-<a href="https://kodi.wiki/view/JSON-RPC_API/v8">the JSON-RPC API in
-Kodi</a> and simply ask Kodi to play from the stream created using
-GStreamer. Streaming the desktop to Kodi now become trivial. Copy
-the script below, run it with the DNS name or IP address of the kodi
-server to stream to as the only argument, and watch your screen show
-up on the Kodi screen. Note, it depend on multicast on the local
-network, so if you need to stream outside the local network, the
-script must be modified. Also note, I have no idea if audio work, as
-I only care about the picture part.</p>
-
-<blockquote><pre>
-#!/bin/sh
-#
-# Stream the Linux desktop view to Kodi. See
-# http://people.skolelinux.org/pere/blog/Streaming_the_Linux_desktop_to_Kodi_using_VLC_and_RTSP.html
-# for backgorund information.
-
-# Make sure the stream is stopped in Kodi and the gstreamer process is
-# killed if something go wrong (for example if curl is unable to find the
-# kodi server). Do the same when interrupting this script.
-kodicmd() {
- host="$1"
- cmd="$2"
- params="$3"
- curl --silent --header 'Content-Type: application/json' \
- --data-binary "{ \"id\": 1, \"jsonrpc\": \"2.0\", \"method\": \"$cmd\", \"params\": $params }" \
- "http://$host/jsonrpc"
-}
-cleanup() {
- if [ -n "$kodihost" ] ; then
- # Stop the playing when we end
- playerid=$(kodicmd "$kodihost" Player.GetActivePlayers "{}" |
- jq .result[].playerid)
- kodicmd "$kodihost" Player.Stop "{ \"playerid\" : $playerid }" > /dev/null
- fi
- if [ "$gstpid" ] && kill -0 "$gstpid" >/dev/null 2>&1; then
- kill "$gstpid"
- fi
-}
-trap cleanup EXIT INT
-
-if [ -n "$1" ]; then
- kodihost=$1
- shift
-else
- kodihost=kodi.local
-fi
-
-mcast=239.255.0.1
-mcastport=1234
-mcastttl=1
-
-pasrc=$(pactl list | grep -A2 'Source #' | grep 'Name: .*\.monitor$' | \
- cut -d" " -f2|head -1)
-gst-launch-1.0 ximagesrc use-damage=0 ! video/x-raw,framerate=30/1 ! \
- videoconvert ! queue2 ! \
- x264enc bitrate=8000 speed-preset=superfast tune=zerolatency qp-min=30 \
- key-int-max=15 bframes=2 ! video/x-h264,profile=high ! queue2 ! \
- mpegtsmux alignment=7 name=mux ! rndbuffersize max=1316 min=1316 ! \
- udpsink host=$mcast port=$mcastport ttl-mc=$mcastttl auto-multicast=1 sync=0 \
- pulsesrc device=$pasrc ! audioconvert ! queue2 ! avenc_aac ! queue2 ! mux. \
- > /dev/null 2>&1 &
-gstpid=$!
-
-# Give stream a second to get going
-sleep 1
-
-# Ask kodi to start streaming using its JSON-RPC API
-kodicmd "$kodihost" Player.Open \
- "{\"item\": { \"file\": \"udp://@$mcast:$mcastport\" } }" > /dev/null
-
-# wait for gst to end
-wait "$gstpid"
-</pre></blockquote>
-
-<p>I hope you find the approach useful. I know I do.</p>
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Non_blocking_bittorrent_plugin_for_vlc.html">Non-blocking bittorrent plugin for vlc</a></div>
+ <div class="date">12th December 2018</div>
+ <div class="body"><p>A few hours ago, a new and improved version (2.4) of
+<a href="https://tracker.debian.org/pkg/vlc-plugin-bittorrent">the VLC
+bittorrent plugin</a> was uploaded to Debian. This new version
+include a complete rewrite of the bittorrent related code, which seem
+to make the plugin non-blocking. This mean you can actually exit VLC
+even when the plugin seem to be unable to get the bittorrent streaming
+started. The new version also include support for filtering playlist
+by file extension using command line options, if you want to avoid
+processing audio, video or images. The package is currently in Debian
+unstable, but should be available in Debian testing in two days. To
+test it, simply install it like this:</p>
+
+<p><pre>
+apt install vlc-plugin-bittorrent
+</pre></p>
+
+<p>After it is installed, you can try to use it to play a file
+downloaded live via bittorrent like this:
+
+<p><pre>
+vlc https://archive.org/download/Glass_201703/Glass_201703_archive.torrent
+</pre></p>
<p>As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
<div class="tags">
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/
debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/
english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
</div>
<div class="padding"></div>
<div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/Streaming_the_Linux_desktop_to_Kodi_using_VLC_and_RTSP.html">Streaming the Linux desktop to Kodi using VLC and RTSP</a></div>
- <div class="date">12th July 2018</div>
- <div class="body"><p>PS: See
-<ahref="http://people.skolelinux.org/pere/blog/Simple_streaming_the_Linux_desktop_to_Kodi_using_GStreamer_and_RTP.html">the
-followup post</a> for a even better approach.</p>
-
-<p>A while back, I was asked by a friend how to stream the desktop to
-my projector connected to Kodi. I sadly had to admit that I had no
-idea, as it was a task I never had tried. Since then, I have been
-looking for a way to do so, preferable without much extra software to
-install on either side. Today I found a way that seem to kind of
-work. Not great, but it is a start.</p>
-
-<p>I had a look at several approaches, for example
-<a href="https://github.com/mfoetsch/dlna_live_streaming">using uPnP
-DLNA as described in 2011</a>, but it required a uPnP server, fuse and
-local storage enough to store the stream locally. This is not going
-to work well for me, lacking enough free space, and it would
-impossible for my friend to get working.</p>
-
-<p>Next, it occurred to me that perhaps I could use VLC to create a
-video stream that Kodi could play. Preferably using
-broadcast/multicast, to avoid having to change any setup on the Kodi
-side when starting such stream. Unfortunately, the only recipe I
-could find using multicast used the rtp protocol, and this protocol
-seem to not be supported by Kodi.</p>
-
-<p>On the other hand, the rtsp protocol is working! Unfortunately I
-have to specify the IP address of the streaming machine in both the
-sending command and the file on the Kodi server. But it is showing my
-desktop, and thus allow us to have a shared look on the big screen at
-the programs I work on.</p>
-
-<p>I did not spend much time investigating codeces. I combined the
-rtp and rtsp recipes from
-<a href="https://wiki.videolan.org/Documentation:Streaming_HowTo/Command_Line_Examples/">the
-VLC Streaming HowTo/Command Line Examples</a>, and was able to get
-this working on the desktop/streaming end.</p>
-
-<blockquote><pre>
-vlc screen:// --sout \
- '#transcode{vcodec=mp4v,acodec=mpga,vb=800,ab=128}:rtp{dst=projector.local,port=1234,sdp=rtsp://192.168.11.4:8080/test.sdp}'
-</pre></blockquote>
-
-<p>I ssh-ed into my Kodi box and created a file like this with the
-same IP address:</p>
-
-<blockquote><pre>
-echo rtsp://192.168.11.4:8080/test.sdp \
- > /storage/videos/screenstream.m3u
-</pre></blockquote>
-
-<p>Note the 192.168.11.4 IP address is my desktops IP address. As far
-as I can tell the IP must be hardcoded for this to work. In other
-words, if someone elses machine is going to do the steaming, you have
-to update screenstream.m3u on the Kodi machine and adjust the vlc
-recipe. To get started, locate the file in Kodi and select the m3u
-file while the VLC stream is running. The desktop then show up in my
-big screen. :)</p>
-
-<p>When using the same technique to stream a video file with audio,
-the audio quality is really bad. No idea if the problem is package
-loss or bad parameters for the transcode. I do not know VLC nor Kodi
-enough to tell.</p>
-
-<p><strong>Update 2018-07-12</strong>: Johannes Schauer send me a few
-succestions and reminded me about an important step. The "screen:"
-input source is only available once the vlc-plugin-access-extra
-package is installed on Debian. Without it, you will see this error
-message: "VLC is unable to open the MRL 'screen://'. Check the log
-for details." He further found that it is possible to drop some parts
-of the VLC command line to reduce the amount of hardcoded information.
-It is also useful to consider using cvlc to avoid having the VLC
-window in the desktop view. In sum, this give us this command line on
-the source end
-
-<blockquote><pre>
-cvlc screen:// --sout \
- '#transcode{vcodec=mp4v,acodec=mpga,vb=800,ab=128}:rtp{sdp=rtsp://:8080/}'
-</pre></blockquote>
-
-<p>and this on the Kodi end<p>
-
-<blockquote><pre>
-echo rtsp://192.168.11.4:8080/ \
- > /storage/videos/screenstream.m3u
-</pre></blockquote>
-
-<p>Still bad image quality, though. But I did discover that streaming
-a DVD using dvdsimple:///dev/dvd as the source had excellent video and
-audio quality, so I guess the issue is in the input or transcoding
-parts, not the rtsp part. I've tried to change the vb and ab
-parameters to use more bandwidth, but it did not make a
-difference.</p>
-
-<p>I further received a suggestion from Einar Haraldseid to try using
-gstreamer instead of VLC, and this proved to work great! He also
-provided me with the trick to get Kodi to use a multicast stream as
-its source. By using this monstrous oneliner, I can stream my desktop
-with good video quality in reasonable framerate to the 239.255.0.1
-multicast address on port 1234:
-
-<blockquote><pre>
-gst-launch-1.0 ximagesrc use-damage=0 ! video/x-raw,framerate=30/1 ! \
- videoconvert ! queue2 ! \
- x264enc bitrate=8000 speed-preset=superfast tune=zerolatency qp-min=30 \
- key-int-max=15 bframes=2 ! video/x-h264,profile=high ! queue2 ! \
- mpegtsmux alignment=7 name=mux ! rndbuffersize max=1316 min=1316 ! \
- udpsink host=239.255.0.1 port=1234 ttl-mc=1 auto-multicast=1 sync=0 \
- pulsesrc device=$(pactl list | grep -A2 'Source #' | \
- grep 'Name: .*\.monitor$' | cut -d" " -f2|head -1) ! \
- audioconvert ! queue2 ! avenc_aac ! queue2 ! mux.
-</pre></blockquote>
-
-<p>and this on the Kodi end<p>
-
-<blockquote><pre>
-echo udp://@239.255.0.1:1234 \
- > /storage/videos/screenstream.m3u
-</pre></blockquote>
-
-<p>Note the trick to pick a valid pulseaudio source. It might not
-pick the one you need. This approach will of course lead to trouble
-if more than one source uses the same multicast port and address.
-Note the ttl-mc=1 setting, which limit the multicast packages to the
-local network. If the value is increased, your screen will be
-broadcasted further, one network "hop" for each increase (read up on
-multicast to learn more. :)!</p>
-
-<p>Having cracked how to get Kodi to receive multicast streams, I
-could use this VLC command to stream to the same multicast address.
-The image quality is way better than the rtsp approach, but gstreamer
-seem to be doing a better job.</p>
-
-<blockquote><pre>
-cvlc screen:// --sout '#transcode{vcodec=mp4v,acodec=mpga,vb=800,ab=128}:rtp{mux=ts,dst=239.255.0.1,port=1234,sdp=sap}'
-</pre></blockquote>
-
-<p>As usual, if you use Bitcoin and want to show your support of my
-activities, please send Bitcoin donations to my address
-<b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Retten_til_kontant_betaling_er_en_rettighet_som_m__brukes_for___beholdes.html">Retten til kontant betaling er en rettighet som må brukes for å beholdes</a></div>
+ <div class="date">11th December 2018</div>
+ <div class="body"><p><a href="https://www.fn.no/Om-FN/Avtaler/Menneskerettigheter/FNs-verdenserklaering-om-menneskerettigheter">FNs
+menneskerettighetserklæring</a> artikkel 13 første punkt lyder som
+følger:</p>
+
+<p><blockquote>
+Enhver har rett til å bevege seg fritt og til fritt å velge
+oppholdssted innenfor en stats grenser.
+</blockquote></p>
+
+<p>Det er altså en menneskerett å kunne bevege seg fritt i landet.
+For å bevege seg fritt i landet, så må en kunne bevege seg uten å bli
+sporet. Det vil i dagens samfunn innebære å bevege seg uten å legge
+igjen digitale spor og uten å være radiomerket. Hvis en vet at ens
+bevegelser, hvor en befinner seg når, og hvem som befinner seg i
+nærheten, blir samlet inn og gjort tilgjengelig for fremmede, det være
+seg myndighetene eller private organisasjoner, så kan en ikke lenger
+bevege seg fritt. Dette gjør at det er en forutsetning for å ha glede
+av retten til å bevege seg fritt i landet at en motstår fristelsen til
+å legge igjen digitale spor når en betaler for seg. Rettigheter som
+ikke blir brukt, blir fjernet. Den eneste måten i dag å unngå å legge
+igjen digitale spor når en betaler for seg, er å betale med kontanter,
+samt takke nei til å legge igjen navn og adresse (slik f.eks. Elkjøp
+ber om — jeg sier de kan legge inn «anonym anonym» når
+datasystemet deres trenger et navn). Personlig anbefaler jeg å
+konsekvent bruke kontant betaling når man beveger seg rundt, for å
+bidra til forsvaret av menneskerettighetene i Norge. Kanskje noe også
+for deg? Merk at det ikke er tilstrekkelig for å unngå sporing å
+betale med kontanter, men det er et lite steg i riktig retning.</p>
+
+<p>Det er flere andre argumenter i tillegg til
+menneskerettighetsargumentet for å bruke kontanter. I går hadde
+Dagbladet en utmerket kommentar av sin journalist John Olav Egeland om
+hvilket
+<a href="https://www.dagbladet.no/kultur/kontantlost-diktatur/70543434">kontantløst
+diktatur</a> som venter oss hvis mange nok slutter å insistere på å
+betale med kontanter. Jeg anbefaler deg å lese den.</p>
+
+<p>Som vanlig, hvis du bruker Bitcoin og ønsker å vise din støtte til
+det jeg driver med, setter jeg pris på om du sender Bitcoin-donasjoner
+til min adresse
+<b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.
+Merk, betaling med bitcoin er ikke anonymt. :)</p>
</div>
<div class="tags">
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk</a>, <a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern</a>.
</div>
<div class="padding"></div>
<div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/What_is_the_most_supported_MIME_type_in_Debian_in_2018_.html">What is the most supported MIME type in Debian in 2018?</a></div>
- <div class="date"> 9th July 2018</div>
- <div class="body"><p>Five years ago,
-<a href="http://people.skolelinux.org/pere/blog/What_is_the_most_supported_MIME_type_in_Debian_.html">I
-measured what the most supported MIME type in Debian was</a>, by
-analysing the desktop files in all packages in the archive. Since
-then, the DEP-11 AppStream system has been put into production, making
-the task a lot easier. This made me want to repeat the measurement,
-to see how much things changed. Here are the new numbers, for
-unstable only this time:
-
-<p><strong>Debian Unstable:</strong></p>
-
-<pre>
- count MIME type
- ----- -----------------------
- 56 image/jpeg
- 55 image/png
- 49 image/tiff
- 48 image/gif
- 39 image/bmp
- 38 text/plain
- 37 audio/mpeg
- 34 application/ogg
- 33 audio/x-flac
- 32 audio/x-mp3
- 30 audio/x-wav
- 30 audio/x-vorbis+ogg
- 29 image/x-portable-pixmap
- 27 inode/directory
- 27 image/x-portable-bitmap
- 27 audio/x-mpeg
- 26 application/x-ogg
- 25 audio/x-mpegurl
- 25 audio/ogg
- 24 text/html
-</pre>
-
-<p>The list was created like this using a sid chroot: "cat
-/var/lib/apt/lists/*sid*_dep11_Components-amd64.yml.gz| zcat | awk '/^
-- \S+\/\S+$/ {print $2 }' | sort | uniq -c | sort -nr | head -20"</p>
-
-<p>It is interesting to see how image formats have passed text/plain
-as the most announced supported MIME type. These days, thanks to the
-AppStream system, if you run into a file format you do not know, and
-want to figure out which packages support the format, you can find the
-MIME type of the file using "file --mime <filename>", and then
-look up all packages announcing support for this format in their
-AppStream metadata (XML or .desktop file) using "appstreamcli
-what-provides mimetype <mime-type>. For example if you, like
-me, want to know which packages support inode/directory, you can get a
-list like this:</p>
-
-<p><blockquote><pre>
-% appstreamcli what-provides mimetype inode/directory | grep Package: | sort
-Package: anjuta
-Package: audacious
-Package: baobab
-Package: cervisia
-Package: chirp
-Package: dolphin
-Package: doublecmd-common
-Package: easytag
-Package: enlightenment
-Package: ephoto
-Package: filelight
-Package: gwenview
-Package: k4dirstat
-Package: kaffeine
-Package: kdesvn
-Package: kid3
-Package: kid3-qt
-Package: nautilus
-Package: nemo
-Package: pcmanfm
-Package: pcmanfm-qt
-Package: qweborf
-Package: ranger
-Package: sirikali
-Package: spacefm
-Package: spacefm
-Package: vifm
-%
-</pre></blockquote></p>
-
-<p>Using the same method, I can quickly discover that the Sketchup file
-format is not yet supported by any package in Debian:</p>
-
-<p><blockquote><pre>
-% appstreamcli what-provides mimetype application/vnd.sketchup.skp
-Could not find component providing 'mimetype::application/vnd.sketchup.skp'.
-%
-</pre></blockquote></p>
-
-<p>Yesterday I used it to figure out which packages support the STL 3D
-format:</p>
-
-<p><blockquote><pre>
-% appstreamcli what-provides mimetype application/sla|grep Package
-Package: cura
-Package: meshlab
-Package: printrun
-%
-</pre></blockquote></p>
-
-<p>PS: A new version of Cura was uploaded to Debian yesterday.</p>
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Why_is_your_site_not_using_Content_Security_Policy___CSP_.html">Why is your site not using Content Security Policy / CSP?</a></div>
+ <div class="date"> 9th December 2018</div>
+ <div class="body"><p>Yesterday, I had the pleasure of watching on Frikanalen the OWASP
+talk by Scott Helme titled
+"<a href="https://frikanalen.no/video/626080/">What We’ve Learned From
+Billions of Security Reports</a>". I had not heard of the
+<a href="https://en.wikipedia.org/wiki/Content_Security_Policy">Content
+Security Policy standard</a> nor its ability to "call home" when a
+browser detect a policy breach (I do not follow web page design
+development much these days), and found the talk very illuminating.</p>
+
+<p>The mechanism allow a web site owner to use HTTP headers to tell
+visitors web browser which sources (internal and external) are allowed to
+be used on the web site. Thus it become possible to enforce a "only
+local content" policy despite web designers urge to fetch programs
+from random sites on the Internet, like the one
+<a href="https://securityaffairs.co/wordpress/68966/hacking/browsealoud-plugin-hack.html">enabling
+the attack</a> reported by Scott Helme earlier this year.</p>
+
+<p>Using CSP seem like an obvious thing for a site admin to implement
+to take some control over the information leak that occur when
+external sources are used to render web pages, it is a mystery more
+sites are not using CSP? It is being
+<a href="https://www.w3.org/TR/CSP/">standardized under W3C</a> these
+days, and is supposed by most web browsers</p>
+
+<p>I managed to find <a href="https://github.com/mozilla/django-csp">a
+Django middleware for implementing CSP</a> and was happy to discover
+it was already in Debian. I plan to use it to add CSP support to the
+Frikanalen web site soon.</p>
<p>As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
<div class="tags">
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram</a>.
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/standard">standard</a>, <a href="http://people.skolelinux.org/pere/blog/tags/web">web</a>.
</div>
<div class="padding"></div>
<div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/Debian_APT_upgrade_without_enough_free_space_on_the_disk___.html">Debian APT upgrade without enough free space on the disk...</a></div>
- <div class="date"> 8th July 2018</div>
- <div class="body"><p>Quite regularly, I let my Debian Sid/Unstable chroot stay untouch
-for a while, and when I need to update it there is not enough free
-space on the disk for apt to do a normal 'apt upgrade'. I normally
-would resolve the issue by doing 'apt install <somepackages>' to
-upgrade only some of the packages in one batch, until the amount of
-packages to download fall below the amount of free space available.
-Today, I had about 500 packages to upgrade, and after a while I got
-tired of trying to install chunks of packages manually. I concluded
-that I did not have the spare hours required to complete the task, and
-decided to see if I could automate it. I came up with this small
-script which I call 'apt-in-chunks':</p>
-
-<p><blockquote><pre>
-#!/bin/sh
-#
-# Upgrade packages when the disk is too full to upgrade every
-# upgradable package in one lump. Fetching packages to upgrade using
-# apt, and then installing using dpkg, to avoid changing the package
-# flag for manual/automatic.
-
-set -e
-
-ignore() {
- if [ "$1" ]; then
- grep -v "$1"
- else
- cat
- fi
-}
-
-for p in $(apt list --upgradable | ignore "$@" |cut -d/ -f1 | grep -v '^Listing...'); do
- echo "Upgrading $p"
- apt clean
- apt install --download-only -y $p
- for f in /var/cache/apt/archives/*.deb; do
- if [ -e "$f" ]; then
- dpkg -i /var/cache/apt/archives/*.deb
- break
- fi
- done
-done
-</pre></blockquote></p>
-
-<p>The script will extract the list of packages to upgrade, try to
-download the packages needed to upgrade one package, install the
-downloaded packages using dpkg. The idea is to upgrade packages
-without changing the APT mark for the package (ie the one recording of
-the package was manually requested or pulled in as a dependency). To
-use it, simply run it as root from the command line. If it fail, try
-'apt install -f' to clean up the mess and run the script again. This
-might happen if the new packages conflict with one of the old
-packages. dpkg is unable to remove, while apt can do this.</p>
-
-<p>It take one option, a package to ignore in the list of packages to
-upgrade. The option to ignore a package is there to be able to skip
-the packages that are simply too large to unpack. Today this was
-'ghc', but I have run into other large packages causing similar
-problems earlier (like TeX).</p>
-
-<p>Update 2018-07-08: Thanks to Paul Wise, I am aware of two
-alternative ways to handle this. The "unattended-upgrades
---minimal-upgrade-steps" option will try to calculate upgrade sets for
-each package to upgrade, and then upgrade them in order, smallest set
-first. It might be a better option than my above mentioned script.
-Also, "aptutude upgrade" can upgrade single packages, thus avoiding
-the need for using "dpkg -i" in the script above.</p>
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/New_and_improved_Frikanalen_Kodi_addon_version_0_0_3.html">New and improved Frikanalen Kodi addon version 0.0.3</a></div>
+ <div class="date"> 8th November 2018</div>
+ <div class="body"><p>If you read my blog regularly, you probably know I am involved in
+running and developing the <a href="https://frikanalen.no/">Norwegian
+TV channel Frikanalen</a>. It is an open channel, allowing everyone
+in Norway to publish videos on a TV channel with national coverage.
+You can think of it as Youtube for national television.
+In addition to distribution on RiksTV and Uninett, Frikanalen is also
+available as a Kodi addon. The last few days I have updated the code
+to add more features. A
+<a href="https://kodi.tv/addon/plugins-video-add-ons/frikanalen-nett-tv">new
+and improved version 0.0.3 Frikanalen addon</a> was just made
+available via the Kodi repositories. This new version include a
+option to browse videos by category, as well as free text search
+in the video archive. It will now also show the video duration in the
+video lists, which were missing earlier. A new and experimental
+link to the HD video stream currently being worked on is provided, for
+those that want to see what the <a href="https://casparcg.com/">CasparCG</a>
+output look like. The alternative is the SD video stream, generated
+using MLT. CasparCG is controlled by our
+<a href="https://github.com/Frikanalen/mltplayout/">mltplayout
+server</a> which instead of talking to mlt is giving PLAY instructions
+to the CasparCG server when it is time to start a new program.</p>
+
+<p>By now, you are probably wondering what kind of content is being
+played on the channel. These days, it is filled with technical
+presentations like those from <a href="https://www.nuug.no/">NUUG</a>,
+<a href="https://www.debconf.org/">Debconf</a>, Makercon, and TED,
+but there are also some periods with
+<a href="https://www.empo.no/">EMPT TV</a> and
+<a href="https://www.p7.no/">P7</a>.
<p>As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
<div class="tags">
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen</a>, <a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
</div>
<div class="padding"></div>
<div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/The_worlds_only_stone_power_plant_.html">The worlds only stone power plant?</a></div>
- <div class="date">30th June 2018</div>
- <div class="body"><p>So far, at least hydro-electric power, coal power, wind power,
-solar power, and wood power are well known. Until a few days ago, I
-had never heard of stone power. Then I learn about a quarry in a
-mountain in
-<a href="https://en.wikipedia.org/wiki/Bremanger">Bremanger</a> i
-Norway, where
-<a href="https://www.bontrup.com/en/activities/raw-materials/bremanger-quarry/">the
-Bremanger Quarry</a> company is extracting stone and dumping the stone
-into a shaft leading to its shipping harbour. This downward movement
-in this shaft is used to produce electricity. In short, it is using
-falling rocks instead of falling water to produce electricity, and
-according to its own statements it is producing more power than it is
-using, and selling the surplus electricity to the Norwegian power
-grid. I find the concept truly amazing. Is this the worlds only
-stone power plant?</p>
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Time_for_an_official_MIME_type_for_patches_.html">Time for an official MIME type for patches?</a></div>
+ <div class="date"> 1st November 2018</div>
+ <div class="body"><p>As part of my involvement in
+<a href="https://gitlab.com/OsloMet-ABI/nikita-noark5-core">the Nikita
+archive API project</a>, I've been importing a fairly large lump of
+emails into a test instance of the archive to see how well this would
+go. I picked a subset of <a href="https://notmuchmail.org/">my
+notmuch email database</a>, all public emails sent to me via
+@lists.debian.org, giving me a set of around 216 000 emails to import.
+In the process, I had a look at the various attachments included in
+these emails, to figure out what to do with attachments, and noticed
+that one of the most common attachment formats do not have
+<a href="https://www.iana.org/assignments/media-types/media-types.xhtml">an
+official MIME type</a> registered with IANA/IETF. The output from
+diff, ie the input for patch, is on the top 10 list of formats
+included in these emails. At the moment people seem to use either
+text/x-patch or text/x-diff, but neither is officially registered. It
+would be better if one official MIME type were registered and used
+everywhere.</p>
+
+<p>To try to get one official MIME type for these files, I've brought
+up the topic on
+<a href="https://www.ietf.org/mailman/listinfo/media-types">the
+media-types mailing list</a>. If you are interested in discussion
+which MIME type to use as the official for patch files, or involved in
+making software using a MIME type for patches, perhaps you would like
+to join the discussion?</p>
<p>As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
<div class="tags">
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/standard">standard</a>.
</div>
<div class="padding"></div>
<div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/Add_on_to_control_the_projector_from_within_Kodi.html">Add-on to control the projector from within Kodi</a></div>
- <div class="date">26th June 2018</div>
- <div class="body"><p>My movie playing setup involve <a href="https://kodi.tv/">Kodi</a>,
-<a href="https://openelec.tv">OpenELEC</a> (probably soon to be
-replaced with <a href="https://libreelec.tv/">LibreELEC</a>) and an
-Infocus IN76 video projector. My projector can be controlled via both
-a infrared remote controller, and a RS-232 serial line. The vendor of
-my projector, <a href="https://www.infocus.com/">InFocus</a>, had been
-sensible enough to document the serial protocol in its user manual, so
-it is easily available, and I used it some years ago to write
-<a href="https://github.com/petterreinholdtsen/infocus-projector-control">a
-small script to control the projector</a>. For a while now, I longed
-for a setup where the projector was controlled by Kodi, for example in
-such a way that when the screen saver went on, the projector was
-turned off, and when the screen saver exited, the projector was turned
-on again.</p>
-
-<p>A few days ago, with very good help from parts of my family, I
-managed to find a Kodi Add-on for controlling a Epson projector, and
-got in touch with its author to see if we could join forces and make a
-Add-on with support for several projectors. To my pleasure, he was
-positive to the idea, and we set out to add InFocus support to his
-add-on, and make the add-on suitable for the official Kodi add-on
-repository.</p>
-
-<p>The Add-on is now working (for me, at least), with a few minor
-adjustments. The most important change I do relative to the master
-branch in the github repository is embedding the
-<a href="https://github.com/pyserial/pyserial">pyserial module</a> in
-the add-on. The long term solution is to make a "script" type
-pyserial module for Kodi, that can be pulled in as a dependency in
-Kodi. But until that in place, I embed it.</p>
-
-<p>The add-on can be configured to turn on the projector when Kodi
-starts, off when Kodi stops as well as turn the projector off when the
-screensaver start and on when the screesaver stops. It can also be
-told to set the projector source when turning on the projector.
-
-<p>If this sound interesting to you, check out
-<a href="https://github.com/fredrik-eriksson/kodi_projcontrol">the
-project github repository</a>. Perhaps you can send patches to
-support your projector too? As soon as we find time to wrap up the
-latest changes, it should be available for easy installation using any
-Kodi instance.</p>
-
-<p>For future improvements, I would like to add projector model
-detection and the ability to adjust the brightness level of the
-projector from within Kodi. We also need to figure out how to handle
-the cooling period of the projector. My projector refuses to turn on
-for 60 seconds after it was turned off. This is not handled well by
-the add-on at the moment.</p>
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Measuring_the_speaker_frequency_response_using_the_AUDMES_free_software_GUI___nice_free_software.html">Measuring the speaker frequency response using the AUDMES free software GUI - nice free software</a></div>
+ <div class="date">22nd October 2018</div>
+ <div class="body"><p><img src="http://people.skolelinux.org/pere/blog/images/2018-10-22-audmes-measure-speakers.png" align="right" width="40%"/></p>
+
+<p>My current home stereo is a patchwork of various pieces I got on
+flee markeds over the years. It is amazing what kind of equipment
+show up there. I've been wondering for a while if it was possible to
+measure how well this equipment is working together, and decided to
+see how far I could get using free software. After trawling the web I
+came across an article from DIY Audio and Video on
+<a href="https://www.diyaudioandvideo.com/Tutorial/SpeakerResponseTesting/">Speaker
+Testing and Analysis</a> describing how to test speakers, and it listing
+several software options, among them
+<a href="https://sourceforge.net/projects/audmes/">AUDio MEasurement
+System (AUDMES)</a>. It is the only free software system I could find
+focusing on measuring speakers and audio frequency response. In the
+process I also found an interesting article from NOVO on
+<a href="http://novo.press/understanding-speaker-specifications-and-frequency-response/">Understanding
+Speaker Specifications and Frequency Response</a> and an article from
+ecoustics on
+<a href="https://www.ecoustics.com/articles/understanding-speaker-frequency-response/">Understanding
+Speaker Frequency Response</a>, with a lot of information on what to
+look for and how to interpret the graphs. Armed with this knowledge,
+I set out to measure the state of my speakers.</p>
+
+<p>The first hurdle was that AUDMES hadn't seen a commit for 10 years
+and did not build with current compilers and libraries. I got in
+touch with its author, who no longer was spending time on the program
+but gave me write access to the subversion repository on Sourceforge.
+The end result is that now the code build on Linux and is capable of
+saving and loading the collected frequency response data in CSV
+format. The application is quite nice and flexible, and I was able to
+select the input and output audio interfaces independently. This made
+it possible to use a USB mixer as the input source, while sending
+output via my laptop headphone connection. I lacked the hardware and
+cabling to figure out a different way to get independent cabling to
+speakers and microphone.</p>
+
+<p>Using this setup I could see how a large range of high frequencies
+apparently were not making it out of my speakers. The picture show
+the frequency response measurement of one of the speakers. Note the
+frequency lines seem to be slightly misaligned, compared to the CSV
+output from the program. I can not hear several of these are high
+frequencies, according to measurement from
+<a href="http://freehearingtestsoftware.com">Free Hearing Test
+Software</a>, an freeware system to measure your hearing (still
+looking for a free software alternative), so I do not know if they are
+coming out out the speakers. I thus do not quite know how to figure
+out if the missing frequencies is a problem with the microphone, the
+amplifier or the speakers, but I managed to rule out the audio card in my
+PC by measuring my Bose noise canceling headset using its own
+microphone. This setup was able to see the high frequency tones, so
+the problem with my stereo had to be in the amplifier or speakers.</p>
+
+<p>Anyway, to try to role out one factor I ended up picking up a new
+set of speakers at a flee marked, and these work a lot better than the
+old speakers, so I guess the microphone and amplifier is OK. If you
+need to measure your own speakers, check out AUDMES. If more people
+get involved, perhaps the project could become good enough to
+<a href="https://bugs.debian.org/910876">include in Debian</a>? And if
+you know of some other free software to measure speakers and amplifier
+performance, please let me know. I am aware of the freeware option
+<a href="https://www.roomeqwizard.com/">REW</a>, but I want something
+that can be developed also when the vendor looses interest.</p>
<p>As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
<div class="tags">
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software</a>.
</div>
<div class="padding"></div>
<div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/youtube_dl_for_nedlasting_fra_NRK_med_undertekster___nice_free_software.html">youtube-dl for nedlasting fra NRK med undertekster - nice free software</a></div>
- <div class="date">28th April 2018</div>
- <div class="body"><p>I <a href="https://no.wikipedia.org/wiki/VHS">VHS-kassettenes</a>
-tid var det rett frem å ta vare på et TV-program en ønsket å kunne se
-senere, uten å være avhengig av at programmet ble sendt på nytt.
-Kanskje ønsket en å se programmet på hytten der det ikke var
-TV-signal, eller av andre grunner ha det tilgjengelig for fremtidig
-fornøyelse. Dette er blitt vanskeligere med introduksjon av
-digital-TV og webstreaming, der opptak til harddisk er utenfor de
-flestes kontroll hvis de bruker ufri programvare og bokser kontrollert
-av andre. Men for NRK her i Norge, finnes det heldigvis flere fri
-programvare-alternativer, som jeg har
-<a href="http://people.skolelinux.org/pere/blog/Hvordan_enkelt_laste_ned_filmer_fra_NRK.html">skrevet</a>
-<a href="http://people.skolelinux.org/pere/blog/Hvordan_enkelt_laste_ned_filmer_fra_NRK_med_den__nye__l_sningen.html">om</a>
-<a href="http://people.skolelinux.org/pere/blog/Nedlasting_fra_NRK__som_Matroska_med_undertekster.html">før</a>.
-Så lenge kilden for nedlastingen er lovlig lagt ut på nett (hvilket
-jeg antar NRK gjør), så er slik lagring til privat bruk også lovlig i
-Norge.</p>
-
-<p>Sist jeg så på saken, i 2016, nevnte jeg at
-<a href="https://rg3.github.com/youtube-dl/">youtube-dl</a> ikke kunne
-bake undertekster fra NRK inn i videofilene, og at jeg derfor
-foretrakk andre alternativer. Nylig oppdaget jeg at dette har endret
-seg. Fordelen med youtube-dl er at den er tilgjengelig direkte fra
-Linux-distribusjoner som <a href="https://www.debian.org/">Debian</a>
-og <a href="https://www.ubuntu.com/">Ubuntu</a>, slik at en slipper å
-finne ut selv hvordan en skal få dem til å virke.</p>
-
-<p>For å laste ned et NRK-innslag med undertekster, og få den norske
-underteksten pakket inn i videofilen, så kan følgende kommando
-brukes:</p>
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Web_browser_integration_of_VLC_with_Bittorrent_support.html">Web browser integration of VLC with Bittorrent support</a></div>
+ <div class="date">21st October 2018</div>
+ <div class="body"><p>Bittorrent is as far as I know, currently the most efficient way to
+distribute content on the Internet. It is used all by all sorts of
+content providers, from national TV stations like
+<a href="https://www.nrk.no/">NRK</a>, Linux distributors like
+<a href="https://www.debian.org/">Debian</a> and
+<a href="https://www.ubuntu.com/">Ubuntu</a>, and of course the
+<a href="https://archive.org/">Internet archive</A>.
+
+<p>Almost a month ago
+<a href="https://tracker.debian.org/pkg/vlc-plugin-bittorrent">a new
+package adding Bittorrent support to VLC</a> became available in
+Debian testing and unstable. To test it, simply install it like
+this:</p>
<p><pre>
-youtube-dl --write-sub --sub-format ttml \
- --convert-subtitles srt --embed-subs \
- https://tv.nrk.no/serie/ramm-ferdig-gaa/MUHU11000316/27-04-2018
+apt install vlc-plugin-bittorrent
</pre></p>
-<p>URL-eksemplet er dagens toppsak på tv.nrk.no. Resultatet er en
-MP4-fil med filmen og undertekster som kan spilles av med VLC. Merk
-at VLC ikke viser frem undertekster før du aktiverer dem. For å gjøre
-det, høyreklikk med musa i fremviservinduet, velg menyvalget for
-undertekst og så norsk språk. Jeg testet også '--write-auto-sub',
-men det kommandolinjeargumentet ser ikke ut til å fungere, så jeg
-endte opp med settet med argumentlisten over, som jeg fant i en
-feilrapport i youtube-dl-prosjektets samling over feilrapporter.</p>
-
-<p>Denne støtten i youtube-dl gjør det svært enkelt å lagre
-NRK-innslag, det være seg nyheter, filmer, serier eller dokumentater,
-for å ha dem tilgjengelig for fremtidig referanse og bruk, uavhengig
-av hvor lenge innslagene ligger tilgjengelig hos NRK. Så får det ikke
-hjelpe at NRKs jurister mener at det er
-<a href="http://people.skolelinux.org/pere/blog/Best___ikke_fortelle_noen_at_streaming_er_nedlasting___.html">vesensforskjellig
-å legge tilgjengelig for nedlasting og for streaming</a>, når det rent
-teknisk er samme sak.</p>
-
-<p>Programmet youtube-dl støtter også en rekke andre nettsteder, se
-prosjektoversikten for
-<a href="http://rg3.github.io/youtube-dl/supportedsites.html">en
-komplett liste</a>.</p>
+<p>Since the plugin was made available for the first time in Debian,
+several improvements have been made to it. In version 2.2-4, now
+available in both testing and unstable, a desktop file is provided to
+teach browsers to start VLC when the user click on torrent files or
+magnet links. The last part is thanks to me finally understanding
+what the strange x-scheme-handler style MIME types in desktop files
+are used for. By adding x-scheme-handler/magnet to the MimeType entry
+in the desktop file, at least the browsers Firefox and Chromium will
+suggest to start VLC when selecting a magnet URI on a web page. The
+end result is that now, with the plugin installed in Buster and Sid,
+one can visit any
+<a href="https://archive.org/details/CopyingIsNotTheft1080p">Internet
+Archive page with movies</a> using a web browser and click on the
+torrent link to start streaming the movie.</p>
+
+<p>Note, there is still some misfeatures in the plugin. One is the
+fact that it will hang and
+<a href="https://github.com/johang/vlc-bittorrent/issues/13">block VLC
+from exiting until the torrent streaming starts</a>. Another is the
+fact that it
+<a href="https://github.com/johang/vlc-bittorrent/issues/9">will pick
+and play a random file in a multi file torrent</a>. This is not
+always the video file you want. Combined with the first it can be a
+bit hard to get the video streaming going. But when it work, it seem
+to do a good job.</p>
+
+<p>For the Debian packaging, I would love to find a good way to test
+if the plugin work with VLC using autopkgtest. I tried, but do not
+know enough of the inner workings of VLC to get it working. For now
+the autopkgtest script is only checking if the .so file was
+successfully loaded by VLC. If you have any suggestions, please
+submit a patch to the Debian bug tracking system.</p>
+
+<p>As usual, if you use Bitcoin and want to show your support of my
+activities, please send Bitcoin donations to my address
+<b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
</div>
<div class="tags">
- Tags: <a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software</a>, <a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>, <a href="http://people.skolelinux.org/pere/blog/tags/web">web</a>.
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
</div>
<h2>Archive</h2>
<ul>
+<li>2019
+<ul>
+
+<li><a href="http://people.skolelinux.org/pere/blog/archive/2019/01/">January (2)</a></li>
+
+</ul></li>
+
<li>2018
<ul>
<li><a href="http://people.skolelinux.org/pere/blog/archive/2018/07/">July (5)</a></li>
-<li><a href="http://people.skolelinux.org/pere/blog/archive/2018/08/">August (2)</a></li>
+<li><a href="http://people.skolelinux.org/pere/blog/archive/2018/08/">August (3)</a></li>
+
+<li><a href="http://people.skolelinux.org/pere/blog/archive/2018/09/">September (3)</a></li>
+
+<li><a href="http://people.skolelinux.org/pere/blog/archive/2018/10/">October (5)</a></li>
+
+<li><a href="http://people.skolelinux.org/pere/blog/archive/2018/11/">November (2)</a></li>
+
+<li><a href="http://people.skolelinux.org/pere/blog/archive/2018/12/">December (4)</a></li>
</ul></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (9)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (10)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (161)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (165)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (381)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (396)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (13)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (32)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (33)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (18)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
+
<li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (41)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (10)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (11)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (299)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (301)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (190)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (192)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (33)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (34)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (71)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (73)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (107)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (108)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (54)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (55)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (55)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (58)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (11)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (15)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (66)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (73)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (41)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
</ul>
projects / homepage.git / blobdiff