blog/Recording_video_from_cron_using_VLC.html

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   6     <title>Petter Reinholdtsen: Recording video from cron using VLC</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Recording video from cron using VLC</div>
  24       <div class="date"> 5th April 2009</div>
  25       <div class="body"><p>One think I have wanted to figure out for a along time is how to
  26 run vlc from cron to do recording of video streams on the net.  The
  27 task is trivial with mplayer, but I do not really trust the security
  28 of mplayer (it crashes too often on strange input), and thus prefer
  29 vlc.  I finally found a way to do it today.  I spent an hour or so
  30 searching the web for recipes and reading the documentation.  The
  31 hardest part was to get rid of the GUI window, but after finding the
  32 dummy interface, the command line finally presented itself:</p>
  33
  34 <blockquote><pre>URL=http://www.ping.uio.no/video/rms-oslo_2009.ogg
  35 SAVEFILE=rms.ogg
  36 DISPLAY= vlc -q $URL \
  37   --sout="#duplicate{dst=std{access=file,url='$SAVEFILE'},dst=nodisplay}" \
  38   --intf=dummy</pre></blockquote>
  39
  40 <p>The command stream the URL and store it in the SAVEFILE by
  41 duplicating the output stream to "nodisplay" and the file, using the
  42 dummy interface.  The dummy interface and the nodisplay output make
  43 sure no X interface is needed.</p>
  44
  45 <p>The cron job then need to start this job with the appropriate URL
  46 and file name to save, sleep for the duration wanted, and then kill
  47 the vlc process with SIGTERM.  Here is a complete script
  48 <tt>vlc-record</tt> to use from <tt>at</tt> or <tt>cron</tt>:</p>
  49
  50 <blockquote><pre>#!/bin/sh
  51 set -e
  52 URL="$1"
  53 SAVEFILE="$2"
  54 DURATION="$3"
  55 DISPLAY= vlc -q "$URL" \
  56   --sout="#duplicate{dst=std{access=file,url='$SAVEFILE'},dst=nodisplay}" \
  57   --intf=dummy < /dev/null > /dev/null 2>&1 &
  58 pid=$!
  59 sleep $DURATION
  60 kill $pid
  61 wait $pid</pre></blockquote>
  62 </div>
  63
  64       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.</div>
  65
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 433
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 435
 436 <li>2008
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 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (18)</a></li>
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 492  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
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 515
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 517
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 519
 520  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 521
 522  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (13)</a></li>
 523
 524  <li><a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5 (23)</a></li>
 525
 526  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (319)</a></li>
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 531
 532  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
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 535
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 538  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 539
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 541
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 551
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 555
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 557
 558  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
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 561
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 563
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 565
 566  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (61)</a></li>
 567
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 569
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 571
 572  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 573
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 578  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 579
 580  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 581
 582 </ul>
 583
 584
 585     </div>
 586     <p style="text-align: right">
 587  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 588 </p>
 589
 590   </body>
 591 </html>