<atom:link href="http://people.skolelinux.org/pere/blog/index.rss" rel="self" type="application/rss+xml" />
<item>
- <title>Valutakrambod - A python and bitcoin love story</title>
- <link>http://people.skolelinux.org/pere/blog/Valutakrambod___A_python_and_bitcoin_love_story.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Valutakrambod___A_python_and_bitcoin_love_story.html</guid>
- <pubDate>Sat, 29 Sep 2018 22:20:00 +0200</pubDate>
- <description><p>It would come as no surprise to anyone that I am interested in
-bitcoins and virtual currencies. I've been keeping an eye on virtual
-currencies for many years, and it is part of the reason a few months
-ago, I started writing a python library for collecting currency
-exchange rates and trade on virtual currency exchanges. I decided to
-name the end result valutakrambod, which perhaps can be translated to
-small currency shop.</p>
-
-<p>The library uses the tornado python library to handle HTTP and
-websocket connections, and provide a asynchronous system for
-connecting to and tracking several services. The code is available
-from
-<a href="http://github.com/petterreinholdtsen/valutakrambod">github</a>.</p>
-
-</p>There are two example clients of the library. One is very simple and
-list every updated buy/sell price received from the various services.
-This code is started by running bin/btc-rates and call the client code
-in valutakrambod/client.py. The simple client look like this:</p>
-
-<p><blockquote><pre>
-import functools
-import tornado.ioloop
-import valutakrambod
-class SimpleClient(object):
- def __init__(self):
- self.services = []
- self.streams = []
- pass
- def newdata(self, service, pair, changed):
- print("%-15s %s-%s: %8.3f %8.3f" % (
- service.servicename(),
- pair[0],
- pair[1],
- service.rates[pair]['ask'],
- service.rates[pair]['bid'])
- )
- async def refresh(self, service):
- await service.fetchRates(service.wantedpairs)
- def run(self):
- self.ioloop = tornado.ioloop.IOLoop.current()
- self.services = valutakrambod.service.knownServices()
- for e in self.services:
- service = e()
- service.subscribe(self.newdata)
- stream = service.websocket()
- if stream:
- self.streams.append(stream)
- else:
- # Fetch information from non-streaming services immediately
- self.ioloop.call_later(len(self.services),
- functools.partial(self.refresh, service))
- # as well as regularly
- service.periodicUpdate(60)
- for stream in self.streams:
- stream.connect()
- try:
- self.ioloop.start()
- except KeyboardInterrupt:
- print("Interrupted by keyboard, closing all connections.")
- pass
- for stream in self.streams:
- stream.close()
-</pre></blockquote></p>
-
-<p>The library client loop over all known "public" services,
-initialises it, subscribe to any updates from the service, check and
-activate websocket streaming if the service provide it, and if no
-streaming is supported, fetch information from the service and set up
-a periodic update every 60 seconds. The output from this client can
-look like this:</p>
-
-<p><blockquote><pre>
-Bl3p BTC-EUR: 5687.110 5653.690
-Bl3p BTC-EUR: 5687.110 5653.690
-Bl3p BTC-EUR: 5687.110 5653.690
-Hitbtc BTC-USD: 6594.560 6593.690
-Hitbtc BTC-USD: 6594.560 6593.690
-Bl3p BTC-EUR: 5687.110 5653.690
-Hitbtc BTC-USD: 6594.570 6593.690
-Bitstamp EUR-USD: 1.159 1.154
-Hitbtc BTC-USD: 6594.570 6593.690
-Hitbtc BTC-USD: 6594.580 6593.690
-Hitbtc BTC-USD: 6594.580 6593.690
-Hitbtc BTC-USD: 6594.580 6593.690
-Bl3p BTC-EUR: 5687.110 5653.690
-Paymium BTC-EUR: 5680.000 5620.240
-</pre></blockquote></p>
-
-<p>The exchange order book is tracked in addition to the best buy/sell
-price, for those that need to know the details.</p>
-
-<p>The other example client is focusing on providing a curses view
-with updated buy/sell prices as soon as they are received from the
-services. This code is located in bin/btc-rates-curses and activated
-by using the '-c' argument. Without the argument the "curses" output
-is printed without using curses, which is useful for debugging. The
-curses view look like this:</p>
-
-<p><blockquote><pre>
- Name Pair Bid Ask Spr Ftcd Age
- BitcoinsNorway BTCEUR 5591.8400 5711.0800 2.1% 16 nan 60
- Bitfinex BTCEUR 5671.0000 5671.2000 0.0% 16 22 59
- Bitmynt BTCEUR 5580.8000 5807.5200 3.9% 16 41 60
- Bitpay BTCEUR 5663.2700 nan nan% 15 nan 60
- Bitstamp BTCEUR 5664.8400 5676.5300 0.2% 0 1 1
- Bl3p BTCEUR 5653.6900 5684.9400 0.5% 0 nan 19
- Coinbase BTCEUR 5600.8200 5714.9000 2.0% 15 nan nan
- Kraken BTCEUR 5670.1000 5670.2000 0.0% 14 17 60
- Paymium BTCEUR 5620.0600 5680.0000 1.1% 1 7515 nan
- BitcoinsNorway BTCNOK 52898.9700 54034.6100 2.1% 16 nan 60
- Bitmynt BTCNOK 52960.3200 54031.1900 2.0% 16 41 60
- Bitpay BTCNOK 53477.7833 nan nan% 16 nan 60
- Coinbase BTCNOK 52990.3500 54063.0600 2.0% 15 nan nan
- MiraiEx BTCNOK 52856.5300 54100.6000 2.3% 16 nan nan
- BitcoinsNorway BTCUSD 6495.5300 6631.5400 2.1% 16 nan 60
- Bitfinex BTCUSD 6590.6000 6590.7000 0.0% 16 23 57
- Bitpay BTCUSD 6564.1300 nan nan% 15 nan 60
- Bitstamp BTCUSD 6561.1400 6565.6200 0.1% 0 2 1
- Coinbase BTCUSD 6504.0600 6635.9700 2.0% 14 nan 117
- Gemini BTCUSD 6567.1300 6573.0700 0.1% 16 89 nan
- Hitbtc+BTCUSD 6592.6200 6594.2100 0.0% 0 0 0
- Kraken BTCUSD 6565.2000 6570.9000 0.1% 15 17 58
- Exchangerates EURNOK 9.4665 9.4665 0.0% 16 107789 nan
- Norgesbank EURNOK 9.4665 9.4665 0.0% 16 107789 nan
- Bitstamp EURUSD 1.1537 1.1593 0.5% 4 5 1
- Exchangerates EURUSD 1.1576 1.1576 0.0% 16 107789 nan
- BitcoinsNorway LTCEUR 1.0000 49.0000 98.0% 16 nan nan
- BitcoinsNorway LTCNOK 492.4800 503.7500 2.2% 16 nan 60
- BitcoinsNorway LTCUSD 1.0221 49.0000 97.9% 15 nan nan
- Norgesbank USDNOK 8.1777 8.1777 0.0% 16 107789 nan
-</pre></blockquote></p>
-
-<p>The code for this client is too complex for a simple blog post, so
-you will have to check out the git repository to figure out how it
-work. What I can tell is how the three last numbers on each line
-should be interpreted. The first is how many seconds ago information
-was received from the service. The second is how long ago, according
-to the service, the provided information was updated. The last is an
-estimate on how often the buy/sell values change.</p>
-
-<p>If you find this library useful, or would like to improve it, I
-would love to hear from you. Note that for some of the services I've
-implemented a trading API. It might be the topic of a future blog
-post.</p>
+ <title>Jami as a Zoom client, a trick for password protected rooms...</title>
+ <link>http://people.skolelinux.org/pere/blog/Jami_as_a_Zoom_client__a_trick_for_password_protected_rooms___.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Jami_as_a_Zoom_client__a_trick_for_password_protected_rooms___.html</guid>
+ <pubDate>Fri, 8 May 2020 13:30:00 +0200</pubDate>
+ <description><p>Half a year ago,
+<a href="http://people.skolelinux.org/pere/blog/Jami_Ring__finally_functioning_peer_to_peer_communication_client.html">I
+wrote</a> about <a href="https://jami.net/">the Jami communication
+client</a>, capable of peer-to-peer encrypted communication. It
+handle both messages, audio and video. It uses distributed hash
+tables instead of central infrastructure to connect its users to each
+other, which in my book is a plus. I mentioned briefly that it could
+also work as a SIP client, which came in handy when the higher
+educational sector in Norway started to promote Zoom as its video
+conferencing solution. I am reluctant to use the official Zoom client
+software, due to their <a href="https://zoom.us/terms">copyright
+license clauses</a> prohibiting users to reverse engineer (for example
+to check the security) and benchmark it, and thus prefer to connect to
+Zoom meetings with free software clients.</p>
+
+<p>Jami worked OK as a SIP client to Zoom as long as there was no
+password set on the room. The Jami daemon leak memory like crazy
+(approximately 1 GiB a minute) when I am connected to the video
+conference, so I had to restart the client every 7-10 minutes, which
+is not a great. I tried to get other SIP Linux clients to work
+without success, so I decided I would have to live with this wart
+until someone managed to fix the leak in the dring code base. But
+another problem showed up once the rooms were password protected. I
+could not get my dial tone signaling through from Jami to Zoom, and
+dial tone signaling is used to enter the password when connecting to
+Zoom. I tried a lot of different permutations with my Jami and
+Asterisk setup to try to figure out why the signaling did not get
+through, only to finally discover that the fundamental problem seem to
+be that Zoom is simply not able to receive dial tone signaling when
+connecting via SIP. There seem to be nothing wrong with the Jami and
+Asterisk end, it is simply broken in the Zoom end. I got help from a
+very skilled VoIP engineer figuring out this last part. And being a
+very skilled engineer, he was also able to locate a solution for me.
+Or to be exact, a workaround that solve my initial problem of
+connecting to password protected Zoom rooms using Jami.</p>
+
+<p>So, how do you do this, I am sure you are wondering by now. The
+trick is already
+<a href="https://support.zoom.us/hc/en-us/articles/202405539-H-323-SIP-Room-Connector-Dial-Strings#sip">documented
+from Zoom</a>, and it is to modify the SIP address to include the room
+password. What is most surprising about this is that the
+automatically generated email from Zoom with instructions on how to
+connect via SIP do not mention this. The SIP address to use normally
+consist of the room ID (a number), an @ character and the IP address
+of the Zoom SIP gateway. But Zoom understand a lot more than just the
+room ID in front of the at sign. The format is "<tt>[Meeting
+ID].[Password].[Layout].[Host Key]</tt>", and you can hear see how you
+can both enter password, control the layout (full screen, active
+presence and gallery) and specify the host key to start the meeting.
+The full SIP address entered into Jami to provide the password will
+then look like this (all using made up numbers):</p>
+
+<p><blockquote>
+<tt>sip:657837644.522827@192.168.169.170</tt>
+</blockquote></p>
+
+<p>Now if only jami would reduce its memory usage, I could even
+recommend this setup to others. :)</p>
<p>As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
</item>
<item>
- <title>VLC in Debian now can do bittorrent streaming</title>
- <link>http://people.skolelinux.org/pere/blog/VLC_in_Debian_now_can_do_bittorrent_streaming.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/VLC_in_Debian_now_can_do_bittorrent_streaming.html</guid>
- <pubDate>Mon, 24 Sep 2018 21:20:00 +0200</pubDate>
- <description><p>Back in February, I got curious to see
-<a href="http://people.skolelinux.org/pere/blog/Using_VLC_to_stream_bittorrent_sources.html">if
-VLC now supported Bittorrent streaming</a>. It did not, despite the
-fact that the idea and code to handle such streaming had been floating
-around for years. I did however find
-<a href="https://github.com/johang/vlc-bittorrent">a standalone plugin
-for VLC</a> to do it, and half a year later I decided to wrap up the
-plugin and get it into Debian. I uploaded it to NEW a few days ago,
-and am very happy to report that it
-<a href="https://tracker.debian.org/pkg/vlc-plugin-bittorrent">entered
-Debian</a> a few hours ago, and should be available in Debian/Unstable
-tomorrow, and Debian/Testing in a few days.</p>
-
-<p>With the vlc-plugin-bittorrent package installed you should be able
-to stream videos using a simple call to</p>
-
-<p><blockquote><pre>
-vlc https://archive.org/download/TheGoat/TheGoat_archive.torrent
-</pre></blockquote></p>
-
-</p>It can handle magnet links too. Now if only native vlc had
-bittorrent support. Then a lot more would be helping each other to
-share public domain and creative commons movies. The plugin need some
-stability work with seeking and picking the right file in a torrent
-with many files, but is already usable. Please note that the plugin
-is not removing downloaded files when vlc is stopped, so it can fill
-up your disk if you are not careful. Have fun. :)</p>
-
-<p>I would love to get help maintaining this package. Get in touch if
-you are interested.</p>
+ <title>GnuCOBOL, a free platform to learn and use COBOL - nice free software</title>
+ <link>http://people.skolelinux.org/pere/blog/GnuCOBOL__a_free_platform_to_learn_and_use_COBOL___nice_free_software.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/GnuCOBOL__a_free_platform_to_learn_and_use_COBOL___nice_free_software.html</guid>
+ <pubDate>Wed, 29 Apr 2020 13:10:00 +0200</pubDate>
+ <description><p>The curiosity got the better of me when
+<a href="https://developers.slashdot.org/story/20/04/06/1424246/new-jersey-desperately-needs-cobol-programmers">Slashdot
+reported</a> that New Jersey was desperately looking for
+<a href="https://en.wikipedia.org/wiki/COBOL">COBOL</a> programmers,
+and a few days later it was reported that
+<a href="https://onezero.medium.com/ibm-rallies-cobol-engineers-to-save-overloaded-unemployment-systems-eeadf13eddce">IBM
+tried to locate COBOL programmers</a>.</p>
+
+<p>I thus decided to have a look at free software alternatives to
+learn COBOL, and had the pleasure to find
+<a href="https://sourceforge.net/projects/open-cobol/">GnuCOBOL</a> was
+already <a href="https://tracker.debian.org/pkg/gnucobol">in
+Debian</a>. It used to be called Open Cobol, and is a "compiler"
+transforming COBOL code to C or C++ before giving it to GCC or Visual
+Studio to build binaries.</p>
+
+<p>I managed to get in touch with upstream, and was impressed with the
+quick response, and also was happy to see a new Debian maintainer
+taking over when the original one recently asked to be replaced. A
+new Debian upload was done as recently as yesterday.</p>
+
+<p>Using the Debian package, I was able to follow a simple COBOL
+introduction and make and run simple COBOL programs. It was fun to
+learn a new programming language. If you want to test for yourself,
+<a href="https://en.wikipedia.org/wiki/GnuCOBOL">the GnuCOBOL Wikipedia
+page</a> have a few simple examples to get you startet.</p>
+
+<p>As I do not have much experience with COBOL, I do not know how
+standard compliant it is, but it claim to pass most tests from COBOL
+test suite, which sound good to me. It is nice to know it is possible
+to learn COBOL using software without any usage restrictions, and I am
+very happy such nice free software project as this is available. If
+you as me is curious about COBOL, check it out.</p>
<p>As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
</item>
<item>
- <title>Using the Kodi API to play Youtube videos</title>
- <link>http://people.skolelinux.org/pere/blog/Using_the_Kodi_API_to_play_Youtube_videos.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Using_the_Kodi_API_to_play_Youtube_videos.html</guid>
- <pubDate>Sun, 2 Sep 2018 23:40:00 +0200</pubDate>
- <description><p>I continue to explore my Kodi installation, and today I wanted to
-tell it to play a youtube URL I received in a chat, without having to
-insert search terms using the on-screen keyboard. After searching the
-web for API access to the Youtube plugin and testing a bit, I managed
-to find a recipe that worked. If you got a kodi instance with its API
-available from http://kodihost/jsonrpc, you can try the following to
-have check out a nice cover band.</p>
-
-<p><blockquote><pre>curl --silent --header 'Content-Type: application/json' \
- --data-binary '{ "id": 1, "jsonrpc": "2.0", "method": "Player.Open",
- "params": {"item": { "file":
- "plugin://plugin.video.youtube/play/?video_id=LuRGVM9O0qg" } } }' \
- http://projector.local/jsonrpc</pre></blockquote></p>
-
-<p>I've extended kodi-stream program to take a video source as its
-first argument. It can now handle direct video links, youtube links
-and 'desktop' to stream my desktop to Kodi. It is almost like a
-Chromecast. :)</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>
+ <title>Totalovervåkning av innbyggernes bevegelser - nei takk!</title>
+ <link>http://people.skolelinux.org/pere/blog/Totaloverv_kning_av_innbyggernes_bevegelser___nei_takk_.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Totaloverv_kning_av_innbyggernes_bevegelser___nei_takk_.html</guid>
+ <pubDate>Thu, 16 Apr 2020 20:30:00 +0200</pubDate>
+ <description><p>Jeg er blitt spurt hva jeg synes om lansering av smittestopp-appen,
+overvåkningsløsningen lansert av Folkehelseinstituttet,
+Simula-senteret og Regjeringen i dag, fulgt av klare trusler fra
+regjeringen om konsekvenser hvis befolkningen ikke tar den i bruk.
+Rekker ikke skrive noe fyldig om temaet, men det er klart for meg at
+den utraderer retten til privatliv samt utgjør en personlig
+sikkerhetsrisiko for alle som tar den i bruk. Bare det er nok til at
+det fremstår som en svært dårlig ide å bli med på denne "dugnaden".
+Det finnes andre og bedre tilnærminger enn den valgt av FHI. Har de
+valgt sin tilnærming for å sikre seg nok et datasett i den fremtidige
+ehelse-portalen? Potensialet for misbruk av informasjon samlet inn av
+appen er for stort, effekten på neste krise for klar og gevinsten for
+liten.</p>
+
+<p>For å si det med forhenværende leder i Datatilsynet, Georg Apenes,
+som skrev i en kronikk den gang Datatilsynet vernet
+privatsfæren at
+«<a href="https://www.dagbladet.no/kultur/rent-mel-i-bilen/66333882">SENTRALT
+I en liberal forestillingsverden finner vi aksept av borgerens rett
+til å kunne velge å være i fred; å være u-iakttatt, uregistrert og
+anonym</a>». Det er ikke uten grunn han startet kronikken med
+«Personvern et fremmedord i enkelte av de statsorganene som samler
+inn, oppbevarer og bruker personopplysninger». Der har nok
+statsorganene bare blitt dårligere på 13 år.</p>
+
+<p>Det er jo også verdt å merke seg at personvernrådet i EU (EDPB)
+mener smittestopp-appen
+<a href="https://nrkbeta.no/2020/04/16/personvernrad-i-eu-mener-norsk-app-bryter-med-viktig-personvernprinsipp/">opererer
+i strid med prinsippet om dataminimering</a>. Også de ser at det
+finnes mye bedre måter å gjøre dette på.</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>
</description>
</item>
<item>
- <title>Software created using taxpayers’ money should be Free Software</title>
- <link>http://people.skolelinux.org/pere/blog/Software_created_using_taxpayers__money_should_be_Free_Software.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Software_created_using_taxpayers__money_should_be_Free_Software.html</guid>
- <pubDate>Thu, 30 Aug 2018 13:50:00 +0200</pubDate>
- <description><p>It might seem obvious that software created using tax money should
-be available for everyone to use and improve. Free Software
-Foundation Europe recentlystarted a campaign to help get more people
-to understand this, and I just signed the petition on
-<a href="https://publiccode.eu/">Public Money, Public Code</a> to help
-them. I hope you too will do the same.</p>
+ <title>Ny URL til den frie norske stavekontrollen</title>
+ <link>http://people.skolelinux.org/pere/blog/Ny_URL_til_den_frie_norske_stavekontrollen.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Ny_URL_til_den_frie_norske_stavekontrollen.html</guid>
+ <pubDate>Sat, 21 Mar 2020 08:00:00 +0100</pubDate>
+ <description><p>Det er lenge siden jeg har sett på den norske stavekontrollen, sist
+jeg skrev om temaet var i 2016, og i mellomtiden har nettstedet
+no.speling.org forsvunnet, og både git-depotet på Alioth og
+mailman-tjenesten som hadde epostlistene for oversettelser blitt lagt
+ned. Men bokmål og nynorsk trenger fortsatt stavekontroll, så etter
+et par purringer fra en som har lyst til å forbedre stavekontrollen
+har jeg endelig fått lagt ut ny offentlig kopi av git-depotet. Jeg
+valgte gitlab foran github.. Siste utgave av stavekontrollen kan
+hentes ned fra
+<a href="https://gitlab.com/norwegian-language-tools/spell-norwegian">https://gitlab.com/norwegian-language-tools/spell-norwegian</a>.
+Ingen ny versjon i denne omgang altså, bare et nytt sted å samle
+forbedringer til den frie norske stavekontrollen. :)
+
+<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>
</description>
</item>
<item>
- <title>A bit more on privacy respecting health monitor / fitness tracker</title>
- <link>http://people.skolelinux.org/pere/blog/A_bit_more_on_privacy_respecting_health_monitor___fitness_tracker.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/A_bit_more_on_privacy_respecting_health_monitor___fitness_tracker.html</guid>
- <pubDate>Mon, 13 Aug 2018 09:00:00 +0200</pubDate>
- <description><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>
+ <title>Nikita version 0.5 released - updated free software archive API server</title>
+ <link>http://people.skolelinux.org/pere/blog/Nikita_version_0_5_released___updated_free_software_archive_API_server.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Nikita_version_0_5_released___updated_free_software_archive_API_server.html</guid>
+ <pubDate>Mon, 2 Mar 2020 19:00:00 +0100</pubDate>
+ <description><p>Today, after many months of development, a new release of
+<ahref="https://gitlab.com/OsloMet-ABI/nikita-noark5-core/">Nikita
+Noark 5 core project</a> was finally
+<ahref="https://lists.nuug.no/pipermail/nikita-noark/2020-March/000519.html">announced
+on the project mailing list</a>. The Nikita free software solution is
+an implementation of the Norwegian archive standard Noark 5 used by
+government offices in Norway. These were the changes in version 0.5
+since version 0.4, see the email link above for links to a demo
+site:</p>
+
+<ul>
+
+ <li>Updated to Noark 5 versjon 5.0 API specification.
+ <ul>
+ <li>Changed formatting of _links from [] to {} to match IETF draft
+ on JSON HAL.</li>
+ <li>Merged Registrering og Basisregistrering in version 4 to
+ combined Registrering.</li>
+ <li>DokumentObjekt is now subtype of ArkivEnhet.</li>
+ <li>Introducing new entity Arkivnotat.</li>
+ <li>Changed all relation keys to use /v5/ instead of /v4/.</li>
+ <li>Corrected to use new official relation keys when possible.</li>
+ <li>Renamed Sakspart to Part and connect it to Mappe, Registrering
+ and Dokumentbeskrivelse instead of only Saksmappe.</li>
+ <li>Moved Korrespondansepart connection from Journalpost to
+ Registrering.</li>
+ <li>Moved Part and Korrespondansepart from package sakarkiv to
+ arkivstruktur.</li>
+ <li>Renamed presedensstatus to presedensStatus.</li>
+ <li>Use new JSON content-type "application/vnd.noark5+json".</li>
+ <li>Updated prepopulated format list to use PRONOM codes.</li>
+ <li>Implemented endpoint for system information.</li>
+ <li>Implemented national identifiers for both file and record.</li>
+ <li>Implemented comments.</li>
+ <li>implemented sign off.</li>
+ <li>implemented conversion.</li>
+ </ul></li>
+ <li>Improved/implemented OData search and paging support for more entities.</li>
+ <li>No longer exposes attribute Dokumentobjekt.referanseDokumentfil,
+ one should use the relation in _links instead.</li>
+ <li>Corrected relation keys under
+ https://rel.arkivverket.no/noark5/v5/api/administrasjon/, replacing
+ 'administrasjon' with 'admin'.</li>
+ <li>Fixed several security and stability issues discovered by Coverity.</li>
+ <li>Corrected handling ETag errors, now return code 409.</li>
+ <li>Improved handling of Kryssreferanse.</li>
+ <li>Changed internal database model to use UUID/SystemID as primary keys
+ in tables.</li>
+ <li>Changed internal database table names to use package prefix.</li>
+ <li>Changed time zone handling for date and datetime attributes, to be
+ more according to the new definition in the API specification.</li>
+ <li>Change revoke-token to only drop token on POST requests, not GET.</li>
+ <li>Updated to newer Spring version.</li>
+ <li>Changed primary key and URL component for metadata code lists to
+ use the 'kode' value instead of a SystemID.</li>
+ <li>Corrected implementation of Part and Sakspart.</li>
+ <li>Changed instance lists with subtypes (like .../registrering/ and
+ .../mappe/) to include the attributes and _links entries for the
+ subtype in the supertype lists.</li>
+ <li>Adjusted _links relations to make it possible to figure out the
+ entity of an instance using the self->href->relation key lookup
+ method.</li>
+ <li>Fixed several end points to make sure GET, PUT, POST and DELETE
+ match each other.</li>
+ <li>Updated DELETE endpoints to work with UUID based entity
+ identifiers.</li>
+ <li>Restructured code to use more common URL related constants in entry
+ point values and replace @RequestMapping with method specific
+ annotations.</li>
+ <li>Added first unit test code.</li>
+ <li>Updated web GUI to work with the updated API.</li>
+ <li>Changed integer fields, enforce them as numeric.</li>
+ <li>Rewrote and simplify metadata handling to use common service and
+ controller code instead of duplicating for each type.</li>
+ <li>Implemented the remaining metadata types.</li>
+ <li>Changed Country list source from Wikipedia to Debian iso-codes and
+ updated the list of Countries.</li>
+ <li>Many many corrections and improvements.</li>
+
+</ul>
+
+<p>If free and open standardized archiving API sound interesting to
+you, please contact us on IRC
+(<a href="irc://irc.freenode.net/%23nikita">#nikita on
+irc.freenode.net</a>) or email
+(<a href="https://lists.nuug.no/mailman/listinfo/nikita-noark">nikita-noark
+mailing list</a>).</p>
<p>As usual, if you use Bitcoin and want to show your support of my
activities, please send Bitcoin donations to my address
</item>
<item>
- <title>Privacy respecting health monitor / fitness tracker?</title>
- <link>http://people.skolelinux.org/pere/blog/Privacy_respecting_health_monitor___fitness_tracker_.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Privacy_respecting_health_monitor___fitness_tracker_.html</guid>
- <pubDate>Tue, 7 Aug 2018 16:00:00 +0200</pubDate>
- <description><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>
+ <title>Blockchain and IoT articles accepted into Records Management Journal</title>
+ <link>http://people.skolelinux.org/pere/blog/Blockchain_and_IoT_articles_accepted_into_Records_Management_Journal.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Blockchain_and_IoT_articles_accepted_into_Records_Management_Journal.html</guid>
+ <pubDate>Thu, 27 Feb 2020 09:05:00 +0100</pubDate>
+ <description><p>On Tuesday, two scietific articles we have been working on for a
+while, was finally accepted for publication into
+<a href="https://www.emerald.com/insight/publication/issn/0956-5698">Records
+Management Journal</a>. Still waiting for the assigned DOI urls to
+start working, but you can have a look at the LaTeX originals here.</p>
+
+<p>The first article is
+"<a href="http://people.skolelinux.org/pere/blog/images/2020-02-25-rmj-iot-record-keeping.pdf">A
+record-keeping approach to managing IoT-data for government
+agencies</a>" (<a href="https://doi.org/10.1108/RMJ-09-2019-0050">DOI
+10.1108/RMJ-09-2019-0050<a/>) by Thomas Sødring, Petter Reinholdtsen
+and David Massey, and sketches some approaches for storing measurement
+data (aka Internet of Things sensor data) in a archive, thus providing
+a well defined mechanism for screening and deletion of the information </p>
+
+<p>The second article is
+"<a href="http://people.skolelinux.org/pere/blog/images/2020-02-25-rmj-block-chain-record-keeping.pdf">Publishing
+and using record-keeping structural information in a blockchain</a>"
+(<a href="https://doi.org/10.1108/RMJ-09-2019-0056">DOI
+10.1108/RMJ-09-2019-0056</a>) by Thomas Sødring, Petter Reinholdtsen
+and Svein Ølnes, where we describe a way for third parties to validate
+authenticity and thus improve trust in the records kept in a
+archive.</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><strong>Update 2020-04-26</strong>: Initially managed to swap the
+DOI numbers. Fixed it.</p>
</description>
</item>
<item>
- <title>Sharing images with friends and family using RSS and EXIF/XMP metadata</title>
- <link>http://people.skolelinux.org/pere/blog/Sharing_images_with_friends_and_family_using_RSS_and_EXIF_XMP_metadata.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Sharing_images_with_friends_and_family_using_RSS_and_EXIF_XMP_metadata.html</guid>
- <pubDate>Tue, 31 Jul 2018 23:30:00 +0200</pubDate>
- <description><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
-&lt;enclosure&gt; 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>
-
-<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>
+ <title>Redaksjon på plass for Noark 5 tjenestegrensesnitt</title>
+ <link>http://people.skolelinux.org/pere/blog/Redaksjon_p__plass_for_Noark_5_tjenestegrensesnitt.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Redaksjon_p__plass_for_Noark_5_tjenestegrensesnitt.html</guid>
+ <pubDate>Wed, 5 Feb 2020 14:45:00 +0100</pubDate>
+ <description><p>Arbeidet med å lage et godt, fritt og åpent standardisert maskinelt
+grensesnitt for arkivering, med tilhørende fri
+programvareimplementasjon fortsetter. Jeg snakker om
+<a href="https://github.com/arkivverket/noark5-tjenestegrensesnitt-standard">Noark
+5 Tjenestegrensesnitt</a> og
+<a href="https://gitlab.com/OsloMet-ABI/nikita-noark5-core/">Nikita</a>.
+Siste nytt etter
+<a href="https://www.nuug.no/aktiviteter/20200127-noark-seminar/">seminaret
+for noen dager siden</a>, er vi i Nikita-prosjektet har fått beskjed
+fra Arkivverket at det blir satt ned en redaksjon for å videreutvikle
+spesifikasjonen. Redaksjonen består av Mona Danielsen og Anne Sofie
+Knutsen ved arkivverket, Thomas Sødring ved OsloMet, og meg selv fra
+NUUG. De to sistenevnte tar seg av de åpenbare forbedringene, mens
+hele redaksjonen diskuterer tvilstilfeller. Jeg håper dette vil bidra
+til at vi lykkes i å gjøre denne protokollspesifikasjonen så entydig
+og klar at den vil bidra til et velfungerende marked for
+arkivsystemer, og sikre at programmer som trenger å snakke med
+arkivsystemet kan snakke med enhver implementasjon av
+API-spesifikasjonen. Nikita er den første implementasjonen, men det
+bør blir flere.</p>
+
+<p>Det gjenstår riktig nok endel før vi er i mål, selv om svært mye
+allerede er på plass. Med innspill og forslag til forbedringer fra
+alle som vil ha et leverandøruavhengig og fullstendig
+datamaskinlesbart grensesnitt til arkivet, så tror jeg vi vil
+lykkes.</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>
</description>
</item>
<item>
- <title>Simple streaming the Linux desktop to Kodi using GStreamer and RTP</title>
- <link>http://people.skolelinux.org/pere/blog/Simple_streaming_the_Linux_desktop_to_Kodi_using_GStreamer_and_RTP.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Simple_streaming_the_Linux_desktop_to_Kodi_using_GStreamer_and_RTP.html</guid>
- <pubDate>Thu, 12 Jul 2018 17:55:00 +0200</pubDate>
- <description><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>
-
-<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>
+ <title>Artikkel om Noark 5 Tjenestegrensesnitt og Nikita i Arkivråd nummer 3 for 2019</title>
+ <link>http://people.skolelinux.org/pere/blog/Artikkel_om_Noark_5_Tjenestegrensesnitt_og_Nikita_i_Arkivr_d_nummer_3_for_2019.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Artikkel_om_Noark_5_Tjenestegrensesnitt_og_Nikita_i_Arkivr_d_nummer_3_for_2019.html</guid>
+ <pubDate>Thu, 26 Dec 2019 08:00:00 +0100</pubDate>
+ <description><p>Like før julaften ble en artikkel jeg har skrevet om vedlikehold av
+<a href="https://github.com/arkivverket/noark5-tjenestegrensesnitt-standard">Noark
+5 Tjenestegrensesnitt</a> og Nikita publisert i <a
+href="https://www.arkivrad.no/arkivrad">tidsskriftet Arkivråd</a>.
+Det er basert på
+<a href="http://people.skolelinux.org/pere/blog/_pen_og_gjennomsiktig_vedlikehold_av_spesifikasjonen_for_Noark_5_Tjenestegrensesnitt.html">min bloggpost
+om samme tema</a> som ble publisert 2019-03-11. Jeg oppdaget nettopp
+at nettsiden til tidsskriftet Arkivråd er oppdatert med siste utgave,
+og artikkelen dermed er tilgjengelig for alle. Du finner den i
+<a href="https://www.arkivrad.no/sites/arkivrad/files/arkivrad_03_2019_nett.pdf">PDF-en
+til nummer 2019/3 på side 30-33</a>. Jeg håper leserne av
+tidsskriftet får lyst til å sjekke ut tjenestegrensesnittet og at
+artikkelen vil gjøre det enklere for flere å bidra til en enda bedre,
+klarere og mer entydig API-spesifikasjon. Det kan gjøre at
+<a href="https://gitlab.com/OsloMet-ABI/nikita-noark5-core/">arkivsystemet
+Nikita</a> kan bli enda bedre når spesifikasjonen forbedres.</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>
</description>
</item>
<item>
- <title>Streaming the Linux desktop to Kodi using VLC and RTSP</title>
- <link>http://people.skolelinux.org/pere/blog/Streaming_the_Linux_desktop_to_Kodi_using_VLC_and_RTSP.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Streaming_the_Linux_desktop_to_Kodi_using_VLC_and_RTSP.html</guid>
- <pubDate>Thu, 12 Jul 2018 02:00:00 +0200</pubDate>
- <description><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>
+ <title>Meningsløst, men for hvem...</title>
+ <link>http://people.skolelinux.org/pere/blog/Meningsl_st__men_for_hvem___.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Meningsl_st__men_for_hvem___.html</guid>
+ <pubDate>Wed, 25 Dec 2019 10:35:00 +0100</pubDate>
+ <description><p>En historie som har betydd endel for meg, og som jeg av og til
+tenker på når hverdagen tynger, ble så vidt jeg har klart å finne ut,
+skrevet av <a href="https://en.wikipedia.org/wiki/Loren_Eiseley">Loren
+Eiseley</a> <a href="https://en.wikipedia.org/wiki/The_Star_Thrower">i
+flere ulike varianter</a>. På norsk tror jeg den går under navnet
+«Gutten og sjøstjernen», og jeg fant en oversettelse av en utgave av den
+hos
+<a href="https://no.quora.com/Hva-er-din-favoritthistorie">Quora</a>.
+Fant også <a href="https://www.youtube.com/watch?v=-qClChUdlfI">en
+filmatisering</a>, men den versjonen jeg liker best fant jeg
+<a href="https://www.goodreads.com/author/quotes/56782.Loren_Eiseley">hos
+Goodreads</a>. Jeg oversatte den utgaven til norsk i går, og har lyst
+til å dele den med deg:
+
+<blockquote><p>Mens jeg tok en pause fra skrivingen og vandret på en
+øde strand ved daggry, så jeg en gutt i det fjerne bøye seg ned og
+kaste noe mens han vandret mot meg over den endeløse stranden. Da han
+kom nærmere, kunne jeg se at han kastet sjøstjerner, som var etterlatt
+i sanden av tidevannet, tilbake i havet. Da han var nær nok spurte jeg
+ham hvorfor han jobbet så hardt på denne merkelige oppgaven. Han sa at
+solen snart ville stå opp og tørke sjøstjernene slik at de ville
+dø.</p>
+
+<p>Jeg sa til ham at dette var helt meningsløst. Det var kilometer på
+kilometer med strand, og det lå sjøstjerner hele veien. En person
+alene kunne ikke gjøre noen forskjell. Han smilte da han plukket opp
+neste sjøstjerne. Mens han kastet den så langt ut i havet som han
+klarte sa han, «for denne gjør det en forskjell». Jeg droppet
+skrivingen og tilbrakte resten av morgenen med å kaste
+sjøstjerner.</p>
+
+<p>- Loren Eiseley</p>
+</blockquote>
+
+<p>Kanskje noe du også kan ha glede av å tenke på når ting virker
+håpløst?</p>
+
+<p>Teksten er gjengitt og oversatt basert på utgaven på Good Read,
+uten tillatelse fra noen andre enn meg selv. Jeg håper på tilgivelse,
+hvis det er et problem for noen, da det er gjort i beste mening. Hvis
+eventuell rettighetshaver tar kontakt vil jeg fjerne teksten og i
+stedet legge ut henvendelsen der teksten kreves fjernet.</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>
</description>
</item>
<item>
- <title>What is the most supported MIME type in Debian in 2018?</title>
- <link>http://people.skolelinux.org/pere/blog/What_is_the_most_supported_MIME_type_in_Debian_in_2018_.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/What_is_the_most_supported_MIME_type_in_Debian_in_2018_.html</guid>
- <pubDate>Mon, 9 Jul 2018 08:05:00 +0200</pubDate>
- <description><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 &lt;filename&gt;", and then
-look up all packages announcing support for this format in their
-AppStream metadata (XML or .desktop file) using "appstreamcli
-what-provides mimetype &lt;mime-type&gt;. 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>
-
-<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>
+ <title>Artikkel om Nikita i Arkheion nummer 2019/2</title>
+ <link>http://people.skolelinux.org/pere/blog/Artikkel_om_Nikita_i_Arkheion_nummer_2019_2.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Artikkel_om_Nikita_i_Arkheion_nummer_2019_2.html</guid>
+ <pubDate>Mon, 9 Dec 2019 15:05:00 +0100</pubDate>
+ <description><p>Jeg hadde i dag gleden av å oppdage at en artikkel om
+<a href="https://gitlab.com/OsloMet-ABI/nikita-noark5-core/">arkivsystemet
+Nikita</a> som vi skrev i sommer, nå er publisert i
+<a href="http://www.arkheion.no/">Arkheion, fagtidsskrift for kommunial
+arkivsektor</a>. Du finner artikkelen på side 30-33 i nummer 2019/2,
+PDF kan lastes ned fra nettstedet til tidsskriftet. Kanskje
+publiseringen kan føre til at noen flere får øynene opp for verdien av
+et åpent standardisert API for arkivering og søk i arkivet.</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>
</description>
</item>
projects / homepage.git / blobdiff