blog/tags/video/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>
   4  <head>
   5   <title>Petter Reinholdtsen: Entries Tagged video</title>
   6   <link rel="stylesheet" type="text/css" media="screen" href="../../style.css">
   7   <link rel="alternate" title="RSS Feed" href="video.rss" type="application/rss+xml">
   8  </head>
   9  <body>
  10
  11  <div class="title">
  12   <h1>
  13        <a href="../../">Petter Reinholdtsen</a>
  14
  15   </h1>
  16
  17  </div>
  18
  19  <p>Entries tagged "video".</p>
  20
  21
  22
  23
  24 <div class="entry">
  25  <div class="title">
  26  <a href="../../Software_video_mixer_on_a_USB_stick.html">Software video mixer on a USB stick</a>
  27  </div>
  28  <div class="date">
  29   2008-12-28 15:40
  30  </div>
  31
  32  <div class="body">
  33
  34 <p>The <a href="http://www.nuug.no/">Norwegian Unix User Group</a> is
  35 recording our montly presentation on video, and recently we have
  36 worked on improving the quality of the recordings by mixing the slides
  37 directly with the video stream.  For this, we use the
  38 <a href="http://dvswitch.alioth.debian.org/">dvswitch</a> package from
  39 the Debian video team.  As this require quite one computer per video
  40 source, and NUUG do not have enough laptops available, we need to
  41 borrow laptops.  And to avoid having to install extra software on
  42 these borrwed laptops, I have wrapped up all the programs needed on a
  43 bootable USB stick.  The software required is dvswitch with assosiated
  44 source, sink and mixer applications and
  45 <a href="http://www.kinodv.org/">dvgrab</a>.  To allow this setup to
  46 work without any configuration, I've patched dvswitch to use
  47 <a href="http://www.avahi.org/">avahi</a> to connect the various parts
  48 together.  And to allow us to use laptops without firewire plugs, I
  49 upgraded dvgrab to the one from Debian/unstable to get one that work
  50 with USB sources.  We have not yet tested this setup in a production
  51 setup, but I hope it will work properly, and allow us to set up a
  52 video mixer in a very short time frame.  We will need it for
  53 <a href="http://www.goopen.no/">Go Open 2009</a>.</p>
  54
  55 <p><a href="http://www.nuug.no/pub/video/bin/usbstick-dvswitch.img.gz">The
  56 USB image</a> is for a 1 GB memory stick, but can be used on any
  57 larger stick as well.</p>
  58
  59  </div>
  60  <div class="tags">
  61
  62
  63
  64   Tags: <a href="../../tags/english">english</a>, <a href="../../tags/nuug">nuug</a>, <a href="../../tags/video">video</a>.
  65
  66  </div>
  67 </div>
  68 <div class="padding"></div>
  69
  70 <div class="entry">
  71  <div class="title">
  72  <a href="../../When_web_browser_developers_make_a_video_player___.html">When web browser developers make a video player...</a>
  73  </div>
  74  <div class="date">
  75   2009-01-17 18:50
  76  </div>
  77
  78  <div class="body">
  79
  80 <p>As part of the work we do in <a href="http://www.nuug.no">NUUG</a>
  81 to publish video recordings of our monthly presentations, we provide a
  82 page with embedded video for easy access to the recording.  Putting a
  83 good set of HTML tags together to get working embedded video in all
  84 browsers and across all operating systems is not easy.  I hope this
  85 will become easier when the &lt;video&gt; tag is implemented in all
  86 browsers, but I am not sure.  We provide the recordings in several
  87 formats, MPEG1, Ogg Theora, H.264 and Quicktime, and want the
  88 browser/media plugin to pick one it support and use it to play the
  89 recording, using whatever embed mechanism the browser understand.
  90 There is at least four different tags to use for this, the new HTML5
  91 &lt;video&gt; tag, the &lt;object&gt; tag, the &lt;embed&gt; tag and
  92 the &lt;applet&gt; tag.  All of these take a lot of options, and
  93 finding the best options is a major challenge.</p>
  94
  95 <p>I just tested the experimental Opera browser available from <a
  96 href="http://labs.opera.com">labs.opera.com</a>, to see how it handled
  97 a &lt;video&gt; tag with a few video sources and no extra attributes.
  98 I was not very impressed.  The browser start by fetching a picture
  99 from the video stream.  Not sure if it is the first frame, but it is
 100 definitely very early in the recording.  So far, so good. Next,
 101 instead of streaming the 76 MiB video file, it start to download all
 102 of it, but do not start to play the video.  This mean I have to wait
 103 for several minutes for the downloading to finish.  When the download
 104 is done, the playing of the video do not start!  Waiting for the
 105 download, but I do not get to see the video?  Some testing later, I
 106 discover that I have to add the controls="true" attribute to be able
 107 to get a play button to pres to start the video.  Adding
 108 autoplay="true" did not help.  I sure hope this is a misfeature of the
 109 test version of Opera, and that future implementations of the
 110 &lt;video&gt; tag will stream recordings by default, or at least start
 111 playing when the download is done.</p>
 112
 113 <p>The test page I used (since changed to add more attributes) is
 114 <a href="http://www.nuug.no/aktiviteter/20090113-foredrag-om-foredrag/">available
 115 from the nuug site</a>.  Will have to test it with the new Firefox
 116 too.</p>
 117
 118 <p>In the test process, I discovered a missing feature.  I was unable
 119 to find a way to get the URL of the playing video out of Opera, so I
 120 am not quite sure it picked the Ogg Theora version of the video.  I
 121 sure hope it was using the announced Ogg Theora support. :)</p>
 122
 123  </div>
 124  <div class="tags">
 125
 126
 127
 128   Tags: <a href="../../tags/english">english</a>, <a href="../../tags/multimedia">multimedia</a>, <a href="../../tags/nuug">nuug</a>, <a href="../../tags/video">video</a>, <a href="../../tags/web">web</a>.
 129
 130  </div>
 131 </div>
 132 <div class="padding"></div>
 133
 134 <div class="entry">
 135  <div class="title">
 136  <a href="../../F__rste_vellykkede_videostr__m_fra_NUUG.html">Første vellykkede videostrøm fra NUUG</a>
 137  </div>
 138  <div class="date">
 139   2009-02-11 06:30
 140  </div>
 141
 142  <div class="body">
 143
 144 <p>Jeg ble glad for å se under
 145 <a href="http://www.nuug.no/aktiviteter/20090210-compiz/">gårdagens
 146 medlemsmøte</a> i NUUG Oslo at utsending av live-video fra møtet
 147 fungerte for første gang.  Forrige gang ble det ved en teknisk tabbe
 148 sendt video uten lyd.  Vi kan takke Ole Kristian Lien og resten av
 149 videogruppen i NUUG for at nå NUUG-medlemmer over det ganske land
 150 kunne se foredraget samtidig med oss i Oslo.  Vi opplevde til og med
 151 under møtet å motta spørsmål via IRC som ble besvart der og da.
 152 Opptaket publiseres så snart det er kopiert over til NUUGs
 153 webserver og komprimert.</p>
 154
 155  </div>
 156  <div class="tags">
 157
 158
 159
 160   Tags: <a href="../../tags/norsk">norsk</a>, <a href="../../tags/nuug">nuug</a>, <a href="../../tags/video">video</a>.
 161
 162  </div>
 163 </div>
 164 <div class="padding"></div>
 165
 166 <div class="entry">
 167  <div class="title">
 168  <a href="../../Lisensvalg_for_NUUG_opptakene_endelig_p___plass.html">Lisensvalg for NUUG-opptakene endelig på plass</a>
 169  </div>
 170  <div class="date">
 171   2009-03-06 21:20
 172  </div>
 173
 174  <div class="body">
 175
 176 <p>Etter mange års meditasjon over temaet, har NUUG endelig klart å
 177 bestemme seg for hvilken lisens vi skal bruke på videoopptakene som
 178 gjøres av NUUGs videogruppe.  Ole Kristian har annonsert at lisensen
 179 blir <a href="http://creativecommons.org/licenses/by-sa/3.0/no/">Creative
 180 Commons Navngivelse-Del på samme vilkår 3.0 Norge</a>.  Jeg er veldig
 181 glad for at denne saken endelig er landet.  Lisensen for opptaket til
 182 Stallman-foredraget ble en annen pga. at lisensvalget ikke var avklart
 183 på forhånd og IFI og PING ønsket CC-BY-ND, og må ses på som et unntak
 184 i denne sammenhengen.</p>
 185
 186  </div>
 187  <div class="tags">
 188
 189
 190
 191   Tags: <a href="../../tags/norsk">norsk</a>, <a href="../../tags/nuug">nuug</a>, <a href="../../tags/video">video</a>.
 192
 193  </div>
 194 </div>
 195 <div class="padding"></div>
 196
 197 <div class="entry">
 198  <div class="title">
 199  <a href="../../Frikanalen_og_jul_i_studentr__det.html">Frikanalen og jul i studentrådet</a>
 200  </div>
 201  <div class="date">
 202   2009-03-11 23:40
 203  </div>
 204
 205  <div class="body">
 206
 207 <p>I går
 208 <a href="http://lists.nuug.no/pipermail/interesserte/2009-March/000387.html">lanserte</a>
 209 NUUGs videogruppe
 210 <a href="http://www.frikanalen.no">Frikanalen</a> med
 211 <a href="http://www.nuug.no/pub/video/frikanalen/frontpage.cgi">åpne
 212 standarder</a>, og resultatet av noen intense uker med arbeide kunne
 213 endelig presenteres.  Jeg har tro på åpen kanalkonseptet som
 214 Frikanalen er et eksempel på, der borgerne får anledning til å
 215 kringkaste sitt syn på en åpen og demokratisk måte.  Jeg er veldig
 216 glad vi har fått gjort kanalen tilgjengelig i Ogg Theora, slik at alle
 217 kan få tilgang til opptakene på web, og slipper å måtte installere MS
 218 Silverlight for å spille av opptakene.</p>
 219
 220 <p>Frikanalen har en brokete historie, og dagens inkarnasjon er ikke
 221 helt slik foreningen Åpen kanal planla det for mange år siden, noe som
 222 er bakgrunnen for at det fredag 13. mars 2009 kl 09:00 starter en
 223 rettsak i Oslo tingrett der Kringkasterforeningen (tidligere
 224 foreningen Åpen kanal) har saksøkt kulturdepartementet over
 225 konsesjonsvilkårene til Frikanalen.  Jeg er spent på resultatet.</p>
 226
 227 <p>I arbeidet med Frikanalen med åpne standarder, så har vi hatt glede
 228 av å se en rekke av innslagene som er tilgjengelig.  Her er mye
 229 religiøst sludder, fra
 230 <a href="http://www.nuug.no/pub/video/frikanalen/fetchvideo.cgi?videoId=720">vandring
 231 i jerusalem</a> via
 232 <a href="http://www.nuug.no/pub/video/frikanalen/fetchvideo.cgi?videoId=779">religiøst
 233 vinklede nyheter</a> til
 234 <a
 235 href="http://www.nuug.no/pub/video/frikanalen/fetchvideo.cgi?videoId=2077">kreasjonisk
 236 retorikk</a>, men også fine
 237 <a href="http://www.nuug.no/pub/video/frikanalen/fetchvideo.cgi?videoId=407">dokumentarer
 238 om redningsselskapet</a> og
 239 <a href="http://www.nuug.no/pub/video/frikanalen/fetchvideo.cgi?videoId=2204">interessante
 240 tegneserieanmeldelser</a>.  Det jeg derimot har hatt størst glede av,
 241 er
 242
 243 <a href="http://www.nuug.no/pub/video/frikanalen/fetchvideo.cgi?videoId=1556">jul
 244 i studentrådet</a>, der hver episode var en fest å se på.  Jeg håper
 245 NUUG lykkes med å få ut sine opptak med like stor suksess.</p>
 246
 247  </div>
 248  <div class="tags">
 249
 250
 251
 252   Tags: <a href="../../tags/norsk">norsk</a>, <a href="../../tags/nuug">nuug</a>, <a href="../../tags/video">video</a>.
 253
 254  </div>
 255 </div>
 256 <div class="padding"></div>
 257
 258 <div class="entry">
 259  <div class="title">
 260  <a href="../../Recording_video_from_cron_using_VLC.html">Recording video from cron using VLC</a>
 261  </div>
 262  <div class="date">
 263   2009-04-05 10:00
 264  </div>
 265
 266  <div class="body">
 267
 268 <p>One think I have wanted to figure out for a along time is how to
 269 run vlc from cron to do recording of video streams on the net.  The
 270 task is trivial with mplayer, but I do not really trust the security
 271 of mplayer (it crashes too often on strange input), and thus prefer
 272 vlc.  I finally found a way to do it today.  I spent an hour or so
 273 searching the web for recipes and reading the documentation.  The
 274 hardest part was to get rid of the GUI window, but after finding the
 275 dummy interface, the command line finally presented itself:</p>
 276
 277 <blockquote><pre>URL=http://www.ping.uio.no/video/rms-oslo_2009.ogg
 278 SAVEFILE=rms.ogg
 279 DISPLAY= vlc -q $URL \
 280   --sout="#duplicate{dst=std{access=file,url='$SAVEFILE'},dst=nodisplay}" \
 281   --intf=dummy</pre></blockquote>
 282
 283 <p>The command stream the URL and store it in the SAVEFILE by
 284 duplicating the output stream to "nodisplay" and the file, using the
 285 dummy interface.  The dummy interface and the nodisplay output make
 286 sure no X interface is needed.</p>
 287
 288 <p>The cron job then need to start this job with the appropriate URL
 289 and file name to save, sleep for the duration wanted, and then kill
 290 the vlc process with SIGTERM.  Here is a complete script
 291 <tt>vlc-record</tt> to use from <tt>at</tt> or <tt>cron</tt>:</p>
 292
 293 <blockquote><pre>#!/bin/sh
 294 set -e
 295 URL="$1"
 296 SAVEFILE="$2"
 297 DURATION="$3"
 298 DISPLAY= vlc -q "$URL" \
 299   --sout="#duplicate{dst=std{access=file,url='$SAVEFILE'},dst=nodisplay}" \
 300   --intf=dummy < /dev/null > /dev/null 2>&1 &
 301 pid=$!
 302 sleep $DURATION
 303 kill $pid
 304 wait $pid</pre></blockquote>
 305
 306  </div>
 307  <div class="tags">
 308
 309
 310
 311   Tags: <a href="../../tags/english">english</a>, <a href="../../tags/nuug">nuug</a>, <a href="../../tags/video">video</a>.
 312
 313  </div>
 314 </div>
 315 <div class="padding"></div>
 316
 317  <p style="text-align: right;"><a href="video.rss"><img src="../../xml.gif" alt="RSS Feed" width="36" height="14"></a></p>
 318
 319
 320
 321
 322 <div id="sidebar">
 323
 324 <h2>Archive</h2>
 325 <ul>
 326
 327 <li>2009
 328 <ul>
 329
 330 <li><a href="../../archive/2009/01/">January (8)</a></li>
 331
 332 <li><a href="../../archive/2009/02/">February (8)</a></li>
 333
 334 <li><a href="../../archive/2009/03/">March (12)</a></li>
 335
 336 <li><a href="../../archive/2009/04/">April (10)</a></li>
 337
 338 <li><a href="../../archive/2009/05/">May (6)</a></li>
 339
 340 </ul></li>
 341
 342 <li>2008
 343 <ul>
 344
 345 <li><a href="../../archive/2008/11/">November (5)</a></li>
 346
 347 <li><a href="../../archive/2008/12/">December (7)</a></li>
 348
 349 </ul></li>
 350
 351 </ul>
 352
 353
 354
 355 <h2>Tags</h2>
 356 <ul>
 357
 358  <li><a href="../../tags/3d-printer">3d-printer (11)</a></li>
 359
 360  <li><a href="../../tags/amiga">amiga (1)</a></li>
 361
 362  <li><a href="../../tags/aros">aros (1)</a></li>
 363
 364  <li><a href="../../tags/debian">debian (10)</a></li>
 365
 366  <li><a href="../../tags/debian edu">debian edu (6)</a></li>
 367
 368  <li><a href="../../tags/english">english (12)</a></li>
 369
 370  <li><a href="../../tags/fiksgatami">fiksgatami (1)</a></li>
 371
 372  <li><a href="../../tags/fildeling">fildeling (2)</a></li>
 373
 374  <li><a href="../../tags/lenker">lenker (1)</a></li>
 375
 376  <li><a href="../../tags/ltsp">ltsp (1)</a></li>
 377
 378  <li><a href="../../tags/multimedia">multimedia (2)</a></li>
 379
 380  <li><a href="../../tags/norsk">norsk (44)</a></li>
 381
 382  <li><a href="../../tags/nuug">nuug (44)</a></li>
 383
 384  <li><a href="../../tags/opphavsrett">opphavsrett (3)</a></li>
 385
 386  <li><a href="../../tags/personvern">personvern (6)</a></li>
 387
 388  <li><a href="../../tags/reprap">reprap (10)</a></li>
 389
 390  <li><a href="../../tags/rss">rss (1)</a></li>
 391
 392  <li><a href="../../tags/sikkerhet">sikkerhet (1)</a></li>
 393
 394  <li><a href="../../tags/standard">standard (3)</a></li>
 395
 396  <li><a href="../../tags/stavekontroll">stavekontroll (1)</a></li>
 397
 398  <li><a href="../../tags/video">video (6)</a></li>
 399
 400  <li><a href="../../tags/vitenskap">vitenskap (1)</a></li>
 401
 402  <li><a href="../../tags/web">web (4)</a></li>
 403
 404 </ul>
 405
 406 </div>
 407 </body>
 408 </html>