blog/index.html

   1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
   2           "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
   3 <html xmlns="http://www.w3.org/1999/xhtml" dir="ltr">
   4   <head>
   5     <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
   6     <title>Petter Reinholdtsen</title>
   7     <link rel="stylesheet" type="text/css" media="screen" href="http://people.skolelinux.org/pere/blog/style.css" />
   8     <link rel="stylesheet" type="text/css" media="screen" href="http://people.skolelinux.org/pere/blog/vim.css" />
   9     <link rel="alternate" title="RSS Feed" href="http://people.skolelinux.org/pere/blog/index.rss" type="application/rss+xml" />
  10   </head>
  11   <body>
  12     <div class="title">
  13  <h1>
  14      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  15
  16  </h1>
  17
  18 </div>
  19
  20
  21
  22     <div class="entry">
  23       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Software_created_using_taxpayers__money_should_be_Free_Software.html">Software created using taxpayers’ money should be Free Software</a></div>
  24       <div class="date">30th August 2018</div>
  25       <div class="body"><p>It might seem obvious that software created using tax money should
  26 be available for everyone to use and improve.  Free Software
  27 Foundation Europe recentlystarted a campaign to help get more people
  28 to understand this, and I just signed the petition on
  29 <a href="https://publiccode.eu/">Public Money, Public Code</a> to help
  30 them. I hope you too will do the same.</p>
  31 </div>
  32       <div class="tags">
  33
  34
  35         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett</a>.
  36
  37
  38       </div>
  39     </div>
  40     <div class="padding"></div>
  41
  42     <div class="entry">
  43       <div class="title"><a href="http://people.skolelinux.org/pere/blog/A_bit_more_on_privacy_respecting_health_monitor___fitness_tracker.html">A bit more on privacy respecting health monitor / fitness tracker</a></div>
  44       <div class="date">13th August 2018</div>
  45       <div class="body"><p>A few days ago, I wondered if there are any privacy respecting
  46 health monitors and/or fitness trackers available for sale these days.
  47 I would like to buy one, but do not want to share my personal data
  48 with strangers, nor be forced to have a mobile phone to get data out
  49 of the unit.  I've received some ideas, and would like to share them
  50 with you.
  51
  52 One interesting data point was a pointer to a Free Software app for
  53 Android named
  54 <a href="https://github.com/Freeyourgadget/Gadgetbridge/">Gadgetbridge</a>.
  55 It provide cloudless collection and storing of data from a variety of
  56 trackers.  Its
  57 <a href="https://github.com/Freeyourgadget/Gadgetbridge/#supported-devices">list
  58 of supported devices</a> is a good indicator for units where the
  59 protocol is fairly open, as it is obviously being handled by Free
  60 Software.  Other units are reportedly encrypting the collected
  61 information with their own public key, making sure only the vendor
  62 cloud service is able to extract data from the unit.  The people
  63 contacting me about Gadgetbirde said they were using
  64 <a href="https://us.amazfit.com/shop/bip?variant=336750">Amazfit
  65 Bip</a> and
  66 <a href="http://www.xiaomimi6phone.com/xiaomi-mi-band-3-features-release-date-rumors/">Xiaomi
  67 Band 3</a>.</p>
  68
  69 <p>I also got a suggestion to look at some of the units from Garmin.
  70 I was told their GPS watches can be connected via USB and show up as a
  71 USB storage device with
  72 <a href="https://www.gpsbabel.org/htmldoc-development/fmt_garmin_fit.html">Garmin
  73 FIT files</a> containing the collected measurements.  While
  74 proprietary, FIT files apparently can be read at least by
  75 <a href="https://www.gpsbabel.org">GPSBabel</a> and the
  76 <a href="https://apps.nextcloud.com/apps/gpxpod">GpxPod</a> Nextcloud
  77 app.  It is unclear to me if they can read step count and heart rate
  78 data.  The person I talked to was using a
  79 <a href="https://buy.garmin.com/en-US/US/p/564291">Garmin Forerunner
  80 935</a>, which is a fairly expensive unit.  I doubt it is worth it for
  81 a unit where the vendor clearly is trying its best to move from open
  82 to closed systems.  I still remember when Garmin dropped NMEA support
  83 in its GPSes.</p>
  84
  85 <p>A final idea was to build ones own unit, perhaps by basing it on a
  86 wearable hardware platforms like
  87 <a href="https://learn.adafruit.com/flora-geo-watch">the Flora Geo
  88 Watch</a>.  Sound like fun, but I had more money than time to spend on
  89 the topic, so I suspect it will have to wait for another time.</p>
  90
  91 <p>While I was working on tracking down links, I came across an
  92 inspiring TED talk by Dave Debronkart about
  93 <a href="https://archive.org/details/DavedeBronkart_2010X">being a
  94 e-patient</a>, and discovered the web site
  95 <a href="https://participatorymedicine.org/epatients/">Participatory
  96 Medicine</a>.  If you too want to track your own health and fitness
  97 without having information about your private life floating around on
  98 computers owned by others, I recommend checking it out.</p>
  99
 100 <p>As usual, if you use Bitcoin and want to show your support of my
 101 activities, please send Bitcoin donations to my address
 102 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 103 </div>
 104       <div class="tags">
 105
 106
 107         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
 108
 109
 110       </div>
 111     </div>
 112     <div class="padding"></div>
 113
 114     <div class="entry">
 115       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Privacy_respecting_health_monitor___fitness_tracker_.html">Privacy respecting health monitor / fitness tracker?</a></div>
 116       <div class="date"> 7th August 2018</div>
 117       <div class="body"><p>Dear lazyweb,</p>
 118
 119 <p>I wonder, is there a fitness tracker / health monitor available for
 120 sale today that respect the users privacy?  With this I mean a
 121 watch/bracelet capable of measuring pulse rate and other
 122 fitness/health related values (and by all means, also the correct time
 123 and location if possible), which is <strong>only</strong> provided for
 124 me to extract/read from the unit with computer without a radio beacon
 125 and Internet connection.  In other words, it do not depend on a cell
 126 phone app, and do make the measurements available via other peoples
 127 computer (aka "the cloud").  The collected data should be available
 128 using only free software.  I'm not interested in depending on some
 129 non-free software that will leave me high and dry some time in the
 130 future.  I've been unable to find any such unit.  I would like to buy
 131 it.  The ones I have seen for sale here in Norway are proud to report
 132 that they share my health data with strangers (aka "cloud enabled").
 133 Is there an alternative?  I'm not interested in giving money to people
 134 requiring me to accept "privacy terms" to allow myself to measure my
 135 own health.</p>
 136
 137 <p>As usual, if you use Bitcoin and want to show your support of my
 138 activities, please send Bitcoin donations to my address
 139 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 140 </div>
 141       <div class="tags">
 142
 143
 144         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
 145
 146
 147       </div>
 148     </div>
 149     <div class="padding"></div>
 150
 151     <div class="entry">
 152       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Sharing_images_with_friends_and_family_using_RSS_and_EXIF_XMP_metadata.html">Sharing images with friends and family using RSS and EXIF/XMP metadata</a></div>
 153       <div class="date">31st July 2018</div>
 154       <div class="body"><p>For a while now, I have looked for a sensible way to share images
 155 with my family using a self hosted solution, as it is unacceptable to
 156 place images from my personal life under the control of strangers
 157 working for data hoarders like Google or Dropbox.  The last few days I
 158 have drafted an approach that might work out, and I would like to
 159 share it with you.  I would like to publish images on a server under
 160 my control, and point some Internet connected display units using some
 161 free and open standard to the images I published.  As my primary
 162 language is not limited to ASCII, I need to store metadata using
 163 UTF-8.  Many years ago, I hoped to find a digital photo frame capable
 164 of reading a RSS feed with image references (aka using the
 165 &lt;enclosure&gt; RSS tag), but was unable to find a current supplier
 166 of such frames.  In the end I gave up that approach.</p>
 167
 168 <p>Some months ago, I discovered that
 169 <a href="https://www.jwz.org/xscreensaver/">XScreensaver</a> is able to
 170 read images from a RSS feed, and used it to set up a screen saver on
 171 my home info screen, showing images from the Daily images feed from
 172 NASA.  This proved to work well.  More recently I discovered that
 173 <a href="https://kodi.tv">Kodi</a> (both using
 174 <a href="https://www.openelec.tv/">OpenELEC</a> and
 175 <a href="https://libreelec.tv">LibreELEC</a>) provide the
 176 <a href="https://github.com/grinsted/script.screensaver.feedreader">Feedreader</a>
 177 screen saver capable of reading a RSS feed with images and news.  For
 178 fun, I used it this summer to test Kodi on my parents TV by hooking up
 179 a Raspberry PI unit with LibreELEC, and wanted to provide them with a
 180 screen saver showing selected pictures from my selection.</p>
 181
 182 <p>Armed with motivation and a test photo frame, I set out to generate
 183 a RSS feed for the Kodi instance.  I adjusted my <a
 184 href="https://freedombox.org/">Freedombox</a> instance, created
 185 /var/www/html/privatepictures/, wrote a small Perl script to extract
 186 title and description metadata from the photo files and generate the
 187 RSS file.  I ended up using Perl instead of python, as the
 188 libimage-exiftool-perl Debian package seemed to handle the EXIF/XMP
 189 tags I ended up using, while python3-exif did not.  The relevant EXIF
 190 tags only support ASCII, so I had to find better alternatives.  XMP
 191 seem to have the support I need.</p>
 192
 193 <p>I am a bit unsure which EXIF/XMP tags to use, as I would like to
 194 use tags that can be easily added/updated using normal free software
 195 photo managing software.  I ended up using the tags set using this
 196 exiftool command, as these tags can also be set using digiKam:</p>
 197
 198 <blockquote><pre>
 199 exiftool -headline='The RSS image title' \
 200   -description='The RSS image description.' \
 201   -subject+=for-family photo.jpeg
 202 </pre></blockquote>
 203
 204 <p>I initially tried the "-title" and "keyword" tags, but they were
 205 invisible in digiKam, so I changed to "-headline" and "-subject".  I
 206 use the keyword/subject 'for-family' to flag that the photo should be
 207 shared with my family.  Images with this keyword set are located and
 208 copied into my Freedombox for the RSS generating script to find.</p>
 209
 210 <p>Are there better ways to do this?  Get in touch if you have better
 211 suggestions.</p>
 212
 213 <p>As usual, if you use Bitcoin and want to show your support of my
 214 activities, please send Bitcoin donations to my address
 215 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 216 </div>
 217       <div class="tags">
 218
 219
 220         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
 221
 222
 223       </div>
 224     </div>
 225     <div class="padding"></div>
 226
 227     <div class="entry">
 228       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Simple_streaming_the_Linux_desktop_to_Kodi_using_GStreamer_and_RTP.html">Simple streaming the Linux desktop to Kodi using GStreamer and RTP</a></div>
 229       <div class="date">12th July 2018</div>
 230       <div class="body"><p>Last night, I wrote
 231 <a href="http://people.skolelinux.org/pere/blog/Streaming_the_Linux_desktop_to_Kodi_using_VLC_and_RTSP.html">a
 232 recipe to stream a Linux desktop using VLC to a instance of Kodi</a>.
 233 During the day I received valuable feedback, and thanks to the
 234 suggestions I have been able to rewrite the recipe into a much simpler
 235 approach requiring no setup at all.  It is a single script that take
 236 care of it all.</p>
 237
 238 <p>This new script uses GStreamer instead of VLC to capture the
 239 desktop and stream it to Kodi.  This fixed the video quality issue I
 240 saw initially.  It further removes the need to add a m3u file on the
 241 Kodi machine, as it instead connects to
 242 <a href="https://kodi.wiki/view/JSON-RPC_API/v8">the JSON-RPC API in
 243 Kodi</a> and simply ask Kodi to play from the stream created using
 244 GStreamer.  Streaming the desktop to Kodi now become trivial.  Copy
 245 the script below, run it with the DNS name or IP address of the kodi
 246 server to stream to as the only argument, and watch your screen show
 247 up on the Kodi screen.  Note, it depend on multicast on the local
 248 network, so if you need to stream outside the local network, the
 249 script must be modified.  Also note, I have no idea if audio work, as
 250 I only care about the picture part.</p>
 251
 252 <blockquote><pre>
 253 #!/bin/sh
 254 #
 255 # Stream the Linux desktop view to Kodi.  See
 256 # http://people.skolelinux.org/pere/blog/Streaming_the_Linux_desktop_to_Kodi_using_VLC_and_RTSP.html
 257 # for backgorund information.
 258
 259 # Make sure the stream is stopped in Kodi and the gstreamer process is
 260 # killed if something go wrong (for example if curl is unable to find the
 261 # kodi server).  Do the same when interrupting this script.
 262 kodicmd() {
 263     host="$1"
 264     cmd="$2"
 265     params="$3"
 266     curl --silent --header 'Content-Type: application/json' \
 267          --data-binary "{ \"id\": 1, \"jsonrpc\": \"2.0\", \"method\": \"$cmd\", \"params\": $params }" \
 268          "http://$host/jsonrpc"
 269 }
 270 cleanup() {
 271     if [ -n "$kodihost" ] ; then
 272         # Stop the playing when we end
 273         playerid=$(kodicmd "$kodihost" Player.GetActivePlayers "{}" |
 274                             jq .result[].playerid)
 275         kodicmd "$kodihost" Player.Stop "{ \"playerid\" : $playerid }" > /dev/null
 276     fi
 277     if [ "$gstpid" ] && kill -0 "$gstpid" >/dev/null 2>&1; then
 278         kill "$gstpid"
 279     fi
 280 }
 281 trap cleanup EXIT INT
 282
 283 if [ -n "$1" ]; then
 284     kodihost=$1
 285     shift
 286 else
 287     kodihost=kodi.local
 288 fi
 289
 290 mcast=239.255.0.1
 291 mcastport=1234
 292 mcastttl=1
 293
 294 pasrc=$(pactl list | grep -A2 'Source #' | grep 'Name: .*\.monitor$' | \
 295   cut -d" " -f2|head -1)
 296 gst-launch-1.0 ximagesrc use-damage=0 ! video/x-raw,framerate=30/1 ! \
 297   videoconvert ! queue2 ! \
 298   x264enc bitrate=8000 speed-preset=superfast tune=zerolatency qp-min=30 \
 299   key-int-max=15 bframes=2 ! video/x-h264,profile=high ! queue2 ! \
 300   mpegtsmux alignment=7 name=mux ! rndbuffersize max=1316 min=1316 ! \
 301   udpsink host=$mcast port=$mcastport ttl-mc=$mcastttl auto-multicast=1 sync=0 \
 302   pulsesrc device=$pasrc ! audioconvert ! queue2 ! avenc_aac ! queue2 ! mux. \
 303   > /dev/null 2>&1 &
 304 gstpid=$!
 305
 306 # Give stream a second to get going
 307 sleep 1
 308
 309 # Ask kodi to start streaming using its JSON-RPC API
 310 kodicmd "$kodihost" Player.Open \
 311         "{\"item\": { \"file\": \"udp://@$mcast:$mcastport\" } }" > /dev/null
 312
 313 # wait for gst to end
 314 wait "$gstpid"
 315 </pre></blockquote>
 316
 317 <p>I hope you find the approach useful.  I know I do.</p>
 318
 319 <p>As usual, if you use Bitcoin and want to show your support of my
 320 activities, please send Bitcoin donations to my address
 321 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 322 </div>
 323       <div class="tags">
 324
 325
 326         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
 327
 328
 329       </div>
 330     </div>
 331     <div class="padding"></div>
 332
 333     <div class="entry">
 334       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Streaming_the_Linux_desktop_to_Kodi_using_VLC_and_RTSP.html">Streaming the Linux desktop to Kodi using VLC and RTSP</a></div>
 335       <div class="date">12th July 2018</div>
 336       <div class="body"><p>PS: See
 337 <ahref="http://people.skolelinux.org/pere/blog/Simple_streaming_the_Linux_desktop_to_Kodi_using_GStreamer_and_RTP.html">the
 338 followup post</a> for a even better approach.</p>
 339
 340 <p>A while back, I was asked by a friend how to stream the desktop to
 341 my projector connected to Kodi.  I sadly had to admit that I had no
 342 idea, as it was a task I never had tried.  Since then, I have been
 343 looking for a way to do so, preferable without much extra software to
 344 install on either side.  Today I found a way that seem to kind of
 345 work.  Not great, but it is a start.</p>
 346
 347 <p>I had a look at several approaches, for example
 348 <a href="https://github.com/mfoetsch/dlna_live_streaming">using uPnP
 349 DLNA as described in 2011</a>, but it required a uPnP server, fuse and
 350 local storage enough to store the stream locally.  This is not going
 351 to work well for me, lacking enough free space, and it would
 352 impossible for my friend to get working.</p>
 353
 354 <p>Next, it occurred to me that perhaps I could use VLC to create a
 355 video stream that Kodi could play.  Preferably using
 356 broadcast/multicast, to avoid having to change any setup on the Kodi
 357 side when starting such stream.  Unfortunately, the only recipe I
 358 could find using multicast used the rtp protocol, and this protocol
 359 seem to not be supported by Kodi.</p>
 360
 361 <p>On the other hand, the rtsp protocol is working!  Unfortunately I
 362 have to specify the IP address of the streaming machine in both the
 363 sending command and the file on the Kodi server.  But it is showing my
 364 desktop, and thus allow us to have a shared look on the big screen at
 365 the programs I work on.</p>
 366
 367 <p>I did not spend much time investigating codeces.  I combined the
 368 rtp and rtsp recipes from
 369 <a href="https://wiki.videolan.org/Documentation:Streaming_HowTo/Command_Line_Examples/">the
 370 VLC Streaming HowTo/Command Line Examples</a>, and was able to get
 371 this working on the desktop/streaming end.</p>
 372
 373 <blockquote><pre>
 374 vlc screen:// --sout \
 375   '#transcode{vcodec=mp4v,acodec=mpga,vb=800,ab=128}:rtp{dst=projector.local,port=1234,sdp=rtsp://192.168.11.4:8080/test.sdp}'
 376 </pre></blockquote>
 377
 378 <p>I ssh-ed into my Kodi box and created a file like this with the
 379 same IP address:</p>
 380
 381 <blockquote><pre>
 382 echo rtsp://192.168.11.4:8080/test.sdp \
 383   > /storage/videos/screenstream.m3u
 384 </pre></blockquote>
 385
 386 <p>Note the 192.168.11.4 IP address is my desktops IP address.  As far
 387 as I can tell the IP must be hardcoded for this to work.  In other
 388 words, if someone elses machine is going to do the steaming, you have
 389 to update screenstream.m3u on the Kodi machine and adjust the vlc
 390 recipe.  To get started, locate the file in Kodi and select the m3u
 391 file while the VLC stream is running.  The desktop then show up in my
 392 big screen. :)</p>
 393
 394 <p>When using the same technique to stream a video file with audio,
 395 the audio quality is really bad.  No idea if the problem is package
 396 loss or bad parameters for the transcode.  I do not know VLC nor Kodi
 397 enough to tell.</p>
 398
 399 <p><strong>Update 2018-07-12</strong>: Johannes Schauer send me a few
 400 succestions and reminded me about an important step.  The "screen:"
 401 input source is only available once the vlc-plugin-access-extra
 402 package is installed on Debian.  Without it, you will see this error
 403 message: "VLC is unable to open the MRL 'screen://'.  Check the log
 404 for details."  He further found that it is possible to drop some parts
 405 of the VLC command line to reduce the amount of hardcoded information.
 406 It is also useful to consider using cvlc to avoid having the VLC
 407 window in the desktop view.  In sum, this give us this command line on
 408 the source end
 409
 410 <blockquote><pre>
 411 cvlc screen:// --sout \
 412   '#transcode{vcodec=mp4v,acodec=mpga,vb=800,ab=128}:rtp{sdp=rtsp://:8080/}'
 413 </pre></blockquote>
 414
 415 <p>and this on the Kodi end<p>
 416
 417 <blockquote><pre>
 418 echo rtsp://192.168.11.4:8080/ \
 419   > /storage/videos/screenstream.m3u
 420 </pre></blockquote>
 421
 422 <p>Still bad image quality, though.  But I did discover that streaming
 423 a DVD using dvdsimple:///dev/dvd as the source had excellent video and
 424 audio quality, so I guess the issue is in the input or transcoding
 425 parts, not the rtsp part.  I've tried to change the vb and ab
 426 parameters to use more bandwidth, but it did not make a
 427 difference.</p>
 428
 429 <p>I further received a suggestion from Einar Haraldseid to try using
 430 gstreamer instead of VLC, and this proved to work great!  He also
 431 provided me with the trick to get Kodi to use a multicast stream as
 432 its source.  By using this monstrous oneliner, I can stream my desktop
 433 with good video quality in reasonable framerate to the 239.255.0.1
 434 multicast address on port 1234:
 435
 436 <blockquote><pre>
 437 gst-launch-1.0 ximagesrc use-damage=0 ! video/x-raw,framerate=30/1 ! \
 438   videoconvert ! queue2 ! \
 439   x264enc bitrate=8000 speed-preset=superfast tune=zerolatency qp-min=30 \
 440   key-int-max=15 bframes=2 ! video/x-h264,profile=high ! queue2 ! \
 441   mpegtsmux alignment=7 name=mux ! rndbuffersize max=1316 min=1316 ! \
 442   udpsink host=239.255.0.1 port=1234 ttl-mc=1 auto-multicast=1 sync=0 \
 443   pulsesrc device=$(pactl list | grep -A2 'Source #' | \
 444     grep 'Name: .*\.monitor$' |  cut -d" " -f2|head -1) ! \
 445   audioconvert ! queue2 ! avenc_aac ! queue2 ! mux.
 446 </pre></blockquote>
 447
 448 <p>and this on the Kodi end<p>
 449
 450 <blockquote><pre>
 451 echo udp://@239.255.0.1:1234 \
 452   > /storage/videos/screenstream.m3u
 453 </pre></blockquote>
 454
 455 <p>Note the trick to pick a valid pulseaudio source.  It might not
 456 pick the one you need.  This approach will of course lead to trouble
 457 if more than one source uses the same multicast port and address.
 458 Note the ttl-mc=1 setting, which limit the multicast packages to the
 459 local network.  If the value is increased, your screen will be
 460 broadcasted further, one network "hop" for each increase (read up on
 461 multicast to learn more. :)!</p>
 462
 463 <p>Having cracked how to get Kodi to receive multicast streams, I
 464 could use this VLC command to stream to the same multicast address.
 465 The image quality is way better than the rtsp approach, but gstreamer
 466 seem to be doing a better job.</p>
 467
 468 <blockquote><pre>
 469 cvlc screen:// --sout '#transcode{vcodec=mp4v,acodec=mpga,vb=800,ab=128}:rtp{mux=ts,dst=239.255.0.1,port=1234,sdp=sap}'
 470 </pre></blockquote>
 471
 472 <p>As usual, if you use Bitcoin and want to show your support of my
 473 activities, please send Bitcoin donations to my address
 474 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 475 </div>
 476       <div class="tags">
 477
 478
 479         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
 480
 481
 482       </div>
 483     </div>
 484     <div class="padding"></div>
 485
 486     <div class="entry">
 487       <div class="title"><a href="http://people.skolelinux.org/pere/blog/What_is_the_most_supported_MIME_type_in_Debian_in_2018_.html">What is the most supported MIME type in Debian in 2018?</a></div>
 488       <div class="date"> 9th July 2018</div>
 489       <div class="body"><p>Five years ago,
 490 <a href="http://people.skolelinux.org/pere/blog/What_is_the_most_supported_MIME_type_in_Debian_.html">I
 491 measured what the most supported MIME type in Debian was</a>, by
 492 analysing the desktop files in all packages in the archive.  Since
 493 then, the DEP-11 AppStream system has been put into production, making
 494 the task a lot easier.  This made me want to repeat the measurement,
 495 to see how much things changed.  Here are the new numbers, for
 496 unstable only this time:
 497
 498 <p><strong>Debian Unstable:</strong></p>
 499
 500 <pre>
 501   count MIME type
 502   ----- -----------------------
 503      56 image/jpeg
 504      55 image/png
 505      49 image/tiff
 506      48 image/gif
 507      39 image/bmp
 508      38 text/plain
 509      37 audio/mpeg
 510      34 application/ogg
 511      33 audio/x-flac
 512      32 audio/x-mp3
 513      30 audio/x-wav
 514      30 audio/x-vorbis+ogg
 515      29 image/x-portable-pixmap
 516      27 inode/directory
 517      27 image/x-portable-bitmap
 518      27 audio/x-mpeg
 519      26 application/x-ogg
 520      25 audio/x-mpegurl
 521      25 audio/ogg
 522      24 text/html
 523 </pre>
 524
 525 <p>The list was created like this using a sid chroot: "cat
 526 /var/lib/apt/lists/*sid*_dep11_Components-amd64.yml.gz| zcat | awk '/^
 527 - \S+\/\S+$/ {print $2 }' | sort | uniq -c | sort -nr | head -20"</p>
 528
 529 <p>It is interesting to see how image formats have passed text/plain
 530 as the most announced supported MIME type.  These days, thanks to the
 531 AppStream system, if you run into a file format you do not know, and
 532 want to figure out which packages support the format, you can find the
 533 MIME type of the file using "file --mime &lt;filename&gt;", and then
 534 look up all packages announcing support for this format in their
 535 AppStream metadata (XML or .desktop file) using "appstreamcli
 536 what-provides mimetype &lt;mime-type&gt;.  For example if you, like
 537 me, want to know which packages support inode/directory, you can get a
 538 list like this:</p>
 539
 540 <p><blockquote><pre>
 541 % appstreamcli what-provides mimetype inode/directory | grep Package: | sort
 542 Package: anjuta
 543 Package: audacious
 544 Package: baobab
 545 Package: cervisia
 546 Package: chirp
 547 Package: dolphin
 548 Package: doublecmd-common
 549 Package: easytag
 550 Package: enlightenment
 551 Package: ephoto
 552 Package: filelight
 553 Package: gwenview
 554 Package: k4dirstat
 555 Package: kaffeine
 556 Package: kdesvn
 557 Package: kid3
 558 Package: kid3-qt
 559 Package: nautilus
 560 Package: nemo
 561 Package: pcmanfm
 562 Package: pcmanfm-qt
 563 Package: qweborf
 564 Package: ranger
 565 Package: sirikali
 566 Package: spacefm
 567 Package: spacefm
 568 Package: vifm
 569 %
 570 </pre></blockquote></p>
 571
 572 <p>Using the same method, I can quickly discover that the Sketchup file
 573 format is not yet supported by any package in Debian:</p>
 574
 575 <p><blockquote><pre>
 576 % appstreamcli what-provides mimetype  application/vnd.sketchup.skp
 577 Could not find component providing 'mimetype::application/vnd.sketchup.skp'.
 578 %
 579 </pre></blockquote></p>
 580
 581 <p>Yesterday I used it to figure out which packages support the STL 3D
 582 format:</p>
 583
 584 <p><blockquote><pre>
 585 % appstreamcli what-provides mimetype  application/sla|grep Package
 586 Package: cura
 587 Package: meshlab
 588 Package: printrun
 589 %
 590 </pre></blockquote></p>
 591
 592 <p>PS: A new version of Cura was uploaded to Debian yesterday.</p>
 593
 594 <p>As usual, if you use Bitcoin and want to show your support of my
 595 activities, please send Bitcoin donations to my address
 596 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 597 </div>
 598       <div class="tags">
 599
 600
 601         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram</a>.
 602
 603
 604       </div>
 605     </div>
 606     <div class="padding"></div>
 607
 608     <div class="entry">
 609       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Debian_APT_upgrade_without_enough_free_space_on_the_disk___.html">Debian APT upgrade without enough free space on the disk...</a></div>
 610       <div class="date"> 8th July 2018</div>
 611       <div class="body"><p>Quite regularly, I let my Debian Sid/Unstable chroot stay untouch
 612 for a while, and when I need to update it there is not enough free
 613 space on the disk for apt to do a normal 'apt upgrade'.  I normally
 614 would resolve the issue by doing 'apt install &lt;somepackages&gt;' to
 615 upgrade only some of the packages in one batch, until the amount of
 616 packages to download fall below the amount of free space available.
 617 Today, I had about 500 packages to upgrade, and after a while I got
 618 tired of trying to install chunks of packages manually.  I concluded
 619 that I did not have the spare hours required to complete the task, and
 620 decided to see if I could automate it.  I came up with this small
 621 script which I call 'apt-in-chunks':</p>
 622
 623 <p><blockquote><pre>
 624 #!/bin/sh
 625 #
 626 # Upgrade packages when the disk is too full to upgrade every
 627 # upgradable package in one lump.  Fetching packages to upgrade using
 628 # apt, and then installing using dpkg, to avoid changing the package
 629 # flag for manual/automatic.
 630
 631 set -e
 632
 633 ignore() {
 634     if [ "$1" ]; then
 635         grep -v "$1"
 636     else
 637         cat
 638     fi
 639 }
 640
 641 for p in $(apt list --upgradable | ignore "$@" |cut -d/ -f1 | grep -v '^Listing...'); do
 642     echo "Upgrading $p"
 643     apt clean
 644     apt install --download-only -y $p
 645     for f in /var/cache/apt/archives/*.deb; do
 646         if [ -e "$f" ]; then
 647             dpkg -i /var/cache/apt/archives/*.deb
 648             break
 649         fi
 650     done
 651 done
 652 </pre></blockquote></p>
 653
 654 <p>The script will extract the list of packages to upgrade, try to
 655 download the packages needed to upgrade one package, install the
 656 downloaded packages using dpkg.  The idea is to upgrade packages
 657 without changing the APT mark for the package (ie the one recording of
 658 the package was manually requested or pulled in as a dependency).  To
 659 use it, simply run it as root from the command line.  If it fail, try
 660 'apt install -f' to clean up the mess and run the script again.  This
 661 might happen if the new packages conflict with one of the old
 662 packages.  dpkg is unable to remove, while apt can do this.</p>
 663
 664 <p>It take one option, a package to ignore in the list of packages to
 665 upgrade.  The option to ignore a package is there to be able to skip
 666 the packages that are simply too large to unpack.  Today this was
 667 'ghc', but I have run into other large packages causing similar
 668 problems earlier (like TeX).</p>
 669
 670 <p>Update 2018-07-08: Thanks to Paul Wise, I am aware of two
 671 alternative ways to handle this.  The "unattended-upgrades
 672 --minimal-upgrade-steps" option will try to calculate upgrade sets for
 673 each package to upgrade, and then upgrade them in order, smallest set
 674 first.  It might be a better option than my above mentioned script.
 675 Also, "aptutude upgrade" can upgrade single packages, thus avoiding
 676 the need for using "dpkg -i" in the script above.</p>
 677
 678 <p>As usual, if you use Bitcoin and want to show your support of my
 679 activities, please send Bitcoin donations to my address
 680 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 681 </div>
 682       <div class="tags">
 683
 684
 685         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
 686
 687
 688       </div>
 689     </div>
 690     <div class="padding"></div>
 691
 692     <div class="entry">
 693       <div class="title"><a href="http://people.skolelinux.org/pere/blog/The_worlds_only_stone_power_plant_.html">The worlds only stone power plant?</a></div>
 694       <div class="date">30th June 2018</div>
 695       <div class="body"><p>So far, at least hydro-electric power, coal power, wind power,
 696 solar power, and wood power are well known.  Until a few days ago, I
 697 had never heard of stone power.  Then I learn about a quarry in a
 698 mountain in
 699 <a href="https://en.wikipedia.org/wiki/Bremanger">Bremanger</a> i
 700 Norway, where
 701 <a href="https://www.bontrup.com/en/activities/raw-materials/bremanger-quarry/">the
 702 Bremanger Quarry</a> company is extracting stone and dumping the stone
 703 into a shaft leading to its shipping harbour.  This downward movement
 704 in this shaft is used to produce electricity.  In short, it is using
 705 falling rocks instead of falling water to produce electricity, and
 706 according to its own statements it is producing more power than it is
 707 using, and selling the surplus electricity to the Norwegian power
 708 grid.  I find the concept truly amazing.  Is this the worlds only
 709 stone power plant?</p>
 710
 711 <p>As usual, if you use Bitcoin and want to show your support of my
 712 activities, please send Bitcoin donations to my address
 713 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 714 </div>
 715       <div class="tags">
 716
 717
 718         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.
 719
 720
 721       </div>
 722     </div>
 723     <div class="padding"></div>
 724
 725     <div class="entry">
 726       <div class="title"><a href="http://people.skolelinux.org/pere/blog/Add_on_to_control_the_projector_from_within_Kodi.html">Add-on to control the projector from within Kodi</a></div>
 727       <div class="date">26th June 2018</div>
 728       <div class="body"><p>My movie playing setup involve <a href="https://kodi.tv/">Kodi</a>,
 729 <a href="https://openelec.tv">OpenELEC</a> (probably soon to be
 730 replaced with <a href="https://libreelec.tv/">LibreELEC</a>) and an
 731 Infocus IN76 video projector.  My projector can be controlled via both
 732 a infrared remote controller, and a RS-232 serial line.  The vendor of
 733 my projector, <a href="https://www.infocus.com/">InFocus</a>, had been
 734 sensible enough to document the serial protocol in its user manual, so
 735 it is easily available, and I used it some years ago to write
 736 <a href="https://github.com/petterreinholdtsen/infocus-projector-control">a
 737 small script to control the projector</a>.  For a while now, I longed
 738 for a setup where the projector was controlled by Kodi, for example in
 739 such a way that when the screen saver went on, the projector was
 740 turned off, and when the screen saver exited, the projector was turned
 741 on again.</p>
 742
 743 <p>A few days ago, with very good help from parts of my family, I
 744 managed to find a Kodi Add-on for controlling a Epson projector, and
 745 got in touch with its author to see if we could join forces and make a
 746 Add-on with support for several projectors.  To my pleasure, he was
 747 positive to the idea, and we set out to add InFocus support to his
 748 add-on, and make the add-on suitable for the official Kodi add-on
 749 repository.</p>
 750
 751 <p>The Add-on is now working (for me, at least), with a few minor
 752 adjustments.  The most important change I do relative to the master
 753 branch in the github repository is embedding the
 754 <a href="https://github.com/pyserial/pyserial">pyserial module</a> in
 755 the add-on.  The long term solution is to make a "script" type
 756 pyserial module for Kodi, that can be pulled in as a dependency in
 757 Kodi.  But until that in place, I embed it.</p>
 758
 759 <p>The add-on can be configured to turn on the projector when Kodi
 760 starts, off when Kodi stops as well as turn the projector off when the
 761 screensaver start and on when the screesaver stops.  It can also be
 762 told to set the projector source when turning on the projector.
 763
 764 <p>If this sound interesting to you, check out
 765 <a href="https://github.com/fredrik-eriksson/kodi_projcontrol">the
 766 project github repository</a>.  Perhaps you can send patches to
 767 support your projector too?  As soon as we find time to wrap up the
 768 latest changes, it should be available for easy installation using any
 769 Kodi instance.</p>
 770
 771 <p>For future improvements, I would like to add projector model
 772 detection and the ability to adjust the brightness level of the
 773 projector from within Kodi.  We also need to figure out how to handle
 774 the cooling period of the projector.  My projector refuses to turn on
 775 for 60 seconds after it was turned off.  This is not handled well by
 776 the add-on at the moment.</p>
 777
 778 <p>As usual, if you use Bitcoin and want to show your support of my
 779 activities, please send Bitcoin donations to my address
 780 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 781 </div>
 782       <div class="tags">
 783
 784
 785         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.
 786
 787
 788       </div>
 789     </div>
 790     <div class="padding"></div>
 791
 792     <p style="text-align: right;"><a href="index.rss"><img src="http://people.skolelinux.org/pere/blog/xml.gif" alt="RSS feed" width="36" height="14" /></a></p>
 793     <div id="sidebar">
 794
 795
 796
 797 <h2>Archive</h2>
 798 <ul>
 799
 800 <li>2018
 801 <ul>
 802
 803 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/01/">January (1)</a></li>
 804
 805 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/02/">February (5)</a></li>
 806
 807 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/03/">March (5)</a></li>
 808
 809 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/04/">April (3)</a></li>
 810
 811 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/06/">June (2)</a></li>
 812
 813 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/07/">July (5)</a></li>
 814
 815 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/08/">August (3)</a></li>
 816
 817 </ul></li>
 818
 819 <li>2017
 820 <ul>
 821
 822 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 823
 824 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 825
 826 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
 827
 828 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
 829
 830 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
 831
 832 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
 833
 834 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
 835
 836 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
 837
 838 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
 839
 840 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
 841
 842 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 843
 844 </ul></li>
 845
 846 <li>2016
 847 <ul>
 848
 849 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 850
 851 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
 852
 853 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
 854
 855 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
 856
 857 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
 858
 859 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
 860
 861 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
 862
 863 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
 864
 865 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
 866
 867 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 868
 869 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 870
 871 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 872
 873 </ul></li>
 874
 875 <li>2015
 876 <ul>
 877
 878 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 879
 880 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 881
 882 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
 883
 884 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
 885
 886 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 887
 888 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
 889
 890 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 891
 892 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 893
 894 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 895
 896 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 897
 898 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 899
 900 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 901
 902 </ul></li>
 903
 904 <li>2014
 905 <ul>
 906
 907 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 908
 909 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 910
 911 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 912
 913 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 914
 915 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 916
 917 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 918
 919 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 920
 921 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 922
 923 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 924
 925 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 926
 927 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 928
 929 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 930
 931 </ul></li>
 932
 933 <li>2013
 934 <ul>
 935
 936 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 937
 938 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 939
 940 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 941
 942 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 943
 944 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 945
 946 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 947
 948 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 949
 950 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 951
 952 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 953
 954 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 955
 956 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 957
 958 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 959
 960 </ul></li>
 961
 962 <li>2012
 963 <ul>
 964
 965 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 966
 967 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 968
 969 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 970
 971 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 972
 973 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 974
 975 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 976
 977 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 978
 979 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 980
 981 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 982
 983 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 984
 985 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 986
 987 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 988
 989 </ul></li>
 990
 991 <li>2011
 992 <ul>
 993
 994 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 995
 996 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 997
 998 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 999
1000 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
1001
1002 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
1003
1004 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
1005
1006 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
1007
1008 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
1009
1010 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
1011
1012 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
1013
1014 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
1015
1016 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
1017
1018 </ul></li>
1019
1020 <li>2010
1021 <ul>
1022
1023 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
1024
1025 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
1026
1027 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
1028
1029 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
1030
1031 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
1032
1033 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
1034
1035 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
1036
1037 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
1038
1039 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
1040
1041 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
1042
1043 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
1044
1045 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
1046
1047 </ul></li>
1048
1049 <li>2009
1050 <ul>
1051
1052 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
1053
1054 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
1055
1056 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
1057
1058 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
1059
1060 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
1061
1062 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
1063
1064 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
1065
1066 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
1067
1068 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
1069
1070 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
1071
1072 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
1073
1074 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
1075
1076 </ul></li>
1077
1078 <li>2008
1079 <ul>
1080
1081 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
1082
1083 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
1084
1085 </ul></li>
1086
1087 </ul>
1088
1089
1090
1091 <h2>Tags</h2>
1092 <ul>
1093
1094  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
1095
1096  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
1097
1098  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
1099
1100  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
1101
1102  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (9)</a></li>
1103
1104  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
1105
1106  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
1107
1108  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
1109
1110  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (161)</a></li>
1111
1112  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
1113
1114  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
1115
1116  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
1117
1118  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
1119
1120  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (25)</a></li>
1121
1122  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
1123
1124  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (382)</a></li>
1125
1126  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
1127
1128  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (13)</a></li>
1129
1130  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (32)</a></li>
1131
1132  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
1133
1134  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (18)</a></li>
1135
1136  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
1137
1138  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
1139
1140  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
1141
1142  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
1143
1144  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
1145
1146  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
1147
1148  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
1149
1150  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
1151
1152  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
1153
1154  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
1155
1156  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (41)</a></li>
1157
1158  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (10)</a></li>
1159
1160  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (299)</a></li>
1161
1162  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (190)</a></li>
1163
1164  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (33)</a></li>
1165
1166  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
1167
1168  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (72)</a></li>
1169
1170  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (107)</a></li>
1171
1172  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
1173
1174  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
1175
1176  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
1177
1178  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
1179
1180  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
1181
1182  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
1183
1184  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (6)</a></li>
1185
1186  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
1187
1188  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (54)</a></li>
1189
1190  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
1191
1192  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
1193
1194  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (55)</a></li>
1195
1196  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
1197
1198  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
1199
1200  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
1201
1202  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
1203
1204  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
1205
1206  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
1207
1208  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (11)</a></li>
1209
1210  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (66)</a></li>
1211
1212  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
1213
1214  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (41)</a></li>
1215
1216 </ul>
1217
1218
1219     </div>
1220     <p style="text-align: right">
1221  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
1222 </p>
1223
1224   </body>
1225 </html>