<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>
-
-<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>CasparCG Server for TV broadcast playout in Debian</title>
+ <link>http://people.skolelinux.org/pere/blog/CasparCG_Server_for_TV_broadcast_playout_in_Debian.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/CasparCG_Server_for_TV_broadcast_playout_in_Debian.html</guid>
+ <pubDate>Tue, 15 Jan 2019 00:10:00 +0100</pubDate>
+ <description><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>
</description>
</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>Learn to program with Minetest on Debian</title>
+ <link>http://people.skolelinux.org/pere/blog/Learn_to_program_with_Minetest_on_Debian.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Learn_to_program_with_Minetest_on_Debian.html</guid>
+ <pubDate>Sat, 15 Dec 2018 15:30:00 +0100</pubDate>
+ <description><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
</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>
+ <title>Non-blocking bittorrent plugin for vlc</title>
+ <link>http://people.skolelinux.org/pere/blog/Non_blocking_bittorrent_plugin_for_vlc.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Non_blocking_bittorrent_plugin_for_vlc.html</guid>
+ <pubDate>Wed, 12 Dec 2018 07:20:00 +0100</pubDate>
+ <description><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
</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>Retten til kontant betaling er en rettighet som må brukes for å beholdes</title>
+ <link>http://people.skolelinux.org/pere/blog/Retten_til_kontant_betaling_er_en_rettighet_som_m__brukes_for___beholdes.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Retten_til_kontant_betaling_er_en_rettighet_som_m__brukes_for___beholdes.html</guid>
+ <pubDate>Tue, 11 Dec 2018 10:00:00 +0100</pubDate>
+ <description><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 &mdash; 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>
</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>Why is your site not using Content Security Policy / CSP?</title>
+ <link>http://people.skolelinux.org/pere/blog/Why_is_your_site_not_using_Content_Security_Policy___CSP_.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Why_is_your_site_not_using_Content_Security_Policy___CSP_.html</guid>
+ <pubDate>Sun, 9 Dec 2018 15:00:00 +0100</pubDate>
+ <description><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
</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>New and improved Frikanalen Kodi addon version 0.0.3</title>
+ <link>http://people.skolelinux.org/pere/blog/New_and_improved_Frikanalen_Kodi_addon_version_0_0_3.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/New_and_improved_Frikanalen_Kodi_addon_version_0_0_3.html</guid>
+ <pubDate>Thu, 8 Nov 2018 10:30:00 +0100</pubDate>
+ <description><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
</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>
+ <title>Time for an official MIME type for patches?</title>
+ <link>http://people.skolelinux.org/pere/blog/Time_for_an_official_MIME_type_for_patches_.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Time_for_an_official_MIME_type_for_patches_.html</guid>
+ <pubDate>Thu, 1 Nov 2018 08:15:00 +0100</pubDate>
+ <description><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
</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>
+ <title>Measuring the speaker frequency response using the AUDMES free software GUI - nice free software</title>
+ <link>http://people.skolelinux.org/pere/blog/Measuring_the_speaker_frequency_response_using_the_AUDMES_free_software_GUI___nice_free_software.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Measuring_the_speaker_frequency_response_using_the_AUDMES_free_software_GUI___nice_free_software.html</guid>
+ <pubDate>Mon, 22 Oct 2018 08:40:00 +0200</pubDate>
+ <description><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
</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>
+ <title>Web browser integration of VLC with Bittorrent support</title>
+ <link>http://people.skolelinux.org/pere/blog/Web_browser_integration_of_VLC_with_Bittorrent_support.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Web_browser_integration_of_VLC_with_Bittorrent_support.html</guid>
+ <pubDate>Sun, 21 Oct 2018 09:50:00 +0200</pubDate>
+ <description><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>
+apt install vlc-plugin-bittorrent
+</pre></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
</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>
+ <title>Release 0.2 of free software archive system Nikita announced</title>
+ <link>http://people.skolelinux.org/pere/blog/Release_0_2_of_free_software_archive_system_Nikita_announced.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Release_0_2_of_free_software_archive_system_Nikita_announced.html</guid>
+ <pubDate>Thu, 18 Oct 2018 14:40:00 +0200</pubDate>
+ <description><p>This morning, the new release of the
+<a href="https://gitlab.com/OsloMet-ABI/nikita-noark5-core/">Nikita
+Noark 5 core project</a> was
+<a href="https://lists.nuug.no/pipermail/nikita-noark/2018-October/000406.html">announced
+on the project mailing list</a>. The 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 0.2
+since version 0.1.1 (from NEWS.md):
+
+<ul>
+ <li>Fix typos in REL names</li>
+ <li>Tidy up error message reporting</li>
+ <li>Fix issue where we used Integer.valueOf(), not Integer.getInteger()</li>
+ <li>Change some String handling to StringBuffer</li>
+ <li>Fix error reporting</li>
+ <li>Code tidy-up</li>
+ <li>Fix issue using static non-synchronized SimpleDateFormat to avoid
+ race conditions</li>
+ <li>Fix problem where deserialisers were treating integers as strings</li>
+ <li>Update methods to make them null-safe</li>
+ <li>Fix many issues reported by coverity</li>
+ <li>Improve equals(), compareTo() and hash() in domain model</li>
+ <li>Improvements to the domain model for metadata classes</li>
+ <li>Fix CORS issues when downloading document</li>
+ <li>Implementation of case-handling with registryEntry and document upload</li>
+ <li>Better support in Javascript for OPTIONS</li>
+ <li>Adding concept description of mail integration</li>
+ <li>Improve setting of default values for GET on ny-journalpost</li>
+ <li>Better handling of required values during deserialisation </li>
+ <li>Changed tilknyttetDato (M620) from date to dateTime</li>
+ <li>Corrected some opprettetDato (M600) (de)serialisation errors.</li>
+ <li>Improve parse error reporting.</li>
+ <li>Started on OData search and filtering.</li>
+ <li>Added Contributor Covenant Code of Conduct to project.</li>
+ <li>Moved repository and project from Github to Gitlab.</li>
+ <li>Restructured repository, moved code into src/ and web/.</li>
+ <li>Updated code to use Spring Boot version 2.</li>
+ <li>Added support for OAuth2 authentication.</li>
+ <li>Fixed several bugs discovered by Coverity.</li>
+ <li>Corrected handling of date/datetime fields.</li>
+ <li>Improved error reporting when rejecting during deserializatoin.</li>
+ <li>Adjusted default values provided for ny-arkivdel, ny-mappe,
+ ny-saksmappe, ny-journalpost and ny-dokumentbeskrivelse.</li>
+ <li>Several fixes for korrespondansepart*.</li>
+ <li>Updated web GUI:
+ <ul>
+ <li>Now handle both file upload and download.</li>
+ <li>Uses new OAuth2 authentication for login.</li>
+ <li>Forms now fetches default values from API using GET.</li>
+ <li>Added RFC 822 (email), TIFF and JPEG to list of possible file formats.</li>
+ </ul></li>
+</ul>
+
+<p>The changes and improvements are extensive. Running diffstat on
+the changes between git tab 0.1.1 and 0.2 show 1098 files changed,
+108666 insertions(+), 54066 deletions(-).</p>
+
+<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
projects / homepage.git / blobdiff