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>
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 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 479
 480  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 481
 482  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 483
 484  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 485
 486  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 487
 488  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 489
 490  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 491
 492  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 493
 494  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (23)</a></li>
 495
 496  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 497
 498  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 499
 500  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 501
 502  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 503
 504  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 505
 506  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 507
 508  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 509
 510  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 511
 512  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (13)</a></li>
 513
 514  <li><a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5 (23)</a></li>
 515
 516  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (317)</a></li>
 517
 518  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (198)</a></li>
 519
 520  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (40)</a></li>
 521
 522  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 523
 524  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 525
 526  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (111)</a></li>
 527
 528  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 529
 530  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 531
 532  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 533
 534  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 535
 536  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (12)</a></li>
 537
 538  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 539
 540  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 541
 542  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 543
 544  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (59)</a></li>
 545
 546  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 547
 548  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 549
 550  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (71)</a></li>
 551
 552  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 553
 554  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 555
 556  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (61)</a></li>
 557
 558  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 559
 560  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 561
 562  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 563
 564  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (19)</a></li>
 565
 566  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (75)</a></li>
 567
 568  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 569
 570  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 571
 572 </ul>
 573
 574
 575     </div>
 576     <p style="text-align: right">
 577  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 578 </p>
 579
 580   </body>
 581 </html>