blog/Recording_video_from_cron_using_VLC.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: Recording video from cron using VLC</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   </head>
  10   <body>
  11     <div class="title">
  12  <h1>
  13      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  14
  15  </h1>
  16
  17 </div>
  18
  19
  20     <div class="entry">
  21       <div class="title">Recording video from cron using VLC</div>
  22       <div class="date"> 5th April 2009</div>
  23       <div class="body"><p>One think I have wanted to figure out for a along time is how to
  24 run vlc from cron to do recording of video streams on the net.  The
  25 task is trivial with mplayer, but I do not really trust the security
  26 of mplayer (it crashes too often on strange input), and thus prefer
  27 vlc.  I finally found a way to do it today.  I spent an hour or so
  28 searching the web for recipes and reading the documentation.  The
  29 hardest part was to get rid of the GUI window, but after finding the
  30 dummy interface, the command line finally presented itself:</p>
  31
  32 <blockquote><pre>URL=http://www.ping.uio.no/video/rms-oslo_2009.ogg
  33 SAVEFILE=rms.ogg
  34 DISPLAY= vlc -q $URL \
  35   --sout="#duplicate{dst=std{access=file,url='$SAVEFILE'},dst=nodisplay}" \
  36   --intf=dummy</pre></blockquote>
  37
  38 <p>The command stream the URL and store it in the SAVEFILE by
  39 duplicating the output stream to "nodisplay" and the file, using the
  40 dummy interface.  The dummy interface and the nodisplay output make
  41 sure no X interface is needed.</p>
  42
  43 <p>The cron job then need to start this job with the appropriate URL
  44 and file name to save, sleep for the duration wanted, and then kill
  45 the vlc process with SIGTERM.  Here is a complete script
  46 <tt>vlc-record</tt> to use from <tt>at</tt> or <tt>cron</tt>:</p>
  47
  48 <blockquote><pre>#!/bin/sh
  49 set -e
  50 URL="$1"
  51 SAVEFILE="$2"
  52 DURATION="$3"
  53 DISPLAY= vlc -q "$URL" \
  54   --sout="#duplicate{dst=std{access=file,url='$SAVEFILE'},dst=nodisplay}" \
  55   --intf=dummy < /dev/null > /dev/null 2>&1 &
  56 pid=$!
  57 sleep $DURATION
  58 kill $pid
  59 wait $pid</pre></blockquote>
  60 </div>
  61
  62       <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>
  63
  64
  65     </div>
  66
  67
  68
  69
  70     <div id="sidebar">
  71
  72
  73
  74 <h2>Archive</h2>
  75 <ul>
  76
  77 <li>2012
  78 <ul>
  79
  80 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
  81
  82 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
  83
  84 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
  85
  86 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
  87
  88 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
  89
  90 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
  91
  92 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
  93
  94 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
  95
  96 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
  97
  98 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
  99
 100 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 101
 102 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 103
 104 </ul></li>
 105
 106 <li>2011
 107 <ul>
 108
 109 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 110
 111 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 112
 113 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 114
 115 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 116
 117 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 118
 119 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 120
 121 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 122
 123 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 124
 125 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 126
 127 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 128
 129 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 130
 131 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 132
 133 </ul></li>
 134
 135 <li>2010
 136 <ul>
 137
 138 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 139
 140 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 141
 142 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 143
 144 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 145
 146 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 147
 148 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 149
 150 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 151
 152 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 153
 154 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 155
 156 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 157
 158 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 159
 160 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 161
 162 </ul></li>
 163
 164 <li>2009
 165 <ul>
 166
 167 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 168
 169 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 170
 171 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 172
 173 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 174
 175 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 176
 177 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 178
 179 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 180
 181 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 182
 183 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 184
 185 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 186
 187 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 188
 189 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 190
 191 </ul></li>
 192
 193 <li>2008
 194 <ul>
 195
 196 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 197
 198 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 199
 200 </ul></li>
 201
 202 </ul>
 203
 204
 205
 206 <h2>Tags</h2>
 207 <ul>
 208
 209  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (13)</a></li>
 210
 211  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 212
 213  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 214
 215  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (3)</a></li>
 216
 217  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (5)</a></li>
 218
 219  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (12)</a></li>
 220
 221  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 222
 223  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (59)</a></li>
 224
 225  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (118)</a></li>
 226
 227  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (9)</a></li>
 228
 229  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (7)</a></li>
 230
 231  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 232
 233  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (165)</a></li>
 234
 235  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (21)</a></li>
 236
 237  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (12)</a></li>
 238
 239  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (10)</a></li>
 240
 241  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (9)</a></li>
 242
 243  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (32)</a></li>
 244
 245  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (17)</a></li>
 246
 247  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (8)</a></li>
 248
 249  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (5)</a></li>
 250
 251  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 252
 253  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (25)</a></li>
 254
 255  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (218)</a></li>
 256
 257  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (148)</a></li>
 258
 259  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (6)</a></li>
 260
 261  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 262
 263  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (40)</a></li>
 264
 265  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (60)</a></li>
 266
 267  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (1)</a></li>
 268
 269  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 270
 271  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (2)</a></li>
 272
 273  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (4)</a></li>
 274
 275  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 276
 277  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (4)</a></li>
 278
 279  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 280
 281  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (28)</a></li>
 282
 283  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 284
 285  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (4)</a></li>
 286
 287  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (39)</a></li>
 288
 289  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (3)</a></li>
 290
 291  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (5)</a></li>
 292
 293  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (12)</a></li>
 294
 295  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (1)</a></li>
 296
 297  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (7)</a></li>
 298
 299  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (35)</a></li>
 300
 301  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 302
 303  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (26)</a></li>
 304
 305 </ul>
 306
 307
 308     </div>
 309     <p style="text-align: right">
 310  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.4</a>
 311 </p>
 312
 313   </body>
 314 </html>