Difference between revisions of "V4L TV Viewing"

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(Common configuration and control commands)
(Applications for watching TV)
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* [http://www.kdetv.org kdetv]] -- for the KDE desktop -- [http://websvn.kde.org/trunk/extragear/multimedia/kdetv sourcecode]
 
* [http://www.kdetv.org kdetv]] -- for the KDE desktop -- [http://websvn.kde.org/trunk/extragear/multimedia/kdetv sourcecode]
 
* [http://www.mplayerhq.hu MPlayer] -- the movie player
 
* [http://www.mplayerhq.hu MPlayer] -- the movie player
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** Sample command to play TV for Europe, channel E2
 +
 +
mplayer tv:// -tv driver=v4l2:norm=PAL:input=0:amode=1:width=384:height=288:outfmt=yv12:device=/dev/video0:chanlist=europe-west:channel=E2
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* [http://tvtime.sourceforge.net tvtime] -- high quality video for Linux -- [http://tvtime.sourceforge.net/usage.html user manual]
 
* [http://tvtime.sourceforge.net tvtime] -- high quality video for Linux -- [http://tvtime.sourceforge.net/usage.html user manual]
 
* [http://developers.videolan.org/vlc/ VLC] -- media player and streaming server
 
* [http://developers.videolan.org/vlc/ VLC] -- media player and streaming server

Revision as of 04:01, 2 July 2007

Applications for watching TV

mplayer tv:// -tv driver=v4l2:norm=PAL:input=0:amode=1:width=384:height=288:outfmt=yv12:device=/dev/video0:chanlist=europe-west:channel=E2
  • tvtime -- high quality video for Linux -- user manual
  • VLC -- media player and streaming server
  • xawtv and motv -- original TV viewers for bttv by Gerd Knorr
  • XdTV -- XdTV is a software that allows you to watch record & stream TV sourcecode
  • xine -- a multimedia player that also reads from v4l devices
  • zapping -- for the Gnome desktop

Common configuration and control commands

1. v4l2ucp -- universal control panel for v4l2 devices (available for Debian from Marillat)

2. Command-line control of the TV card

  • v4lctl -c /dev/video1 list
  • v4lctl setnorm ntsc-m
  • v4lctl setfreqtab us-cable
  • v4lctl setfreqtab us-bcast
  • v4lctl setchannel 3
  • v4lctl volume mute off
  • v4lctl volume 100
  • v4lctl audio stereo
  • v4lctl -c /dev/video0 setattr 'chroma agc' on (bttv only)
  • v4lctl -c /dev/video0 hue "100%" (or "0%" -- same thing)
  • v4lctl -c /dev/video1 bright "50%"
  • v4lctl -c /dev/video2 contrast "45%"
  • v4lctl -c /dev/video0 color "50%"

3. Test the video

  • xawtv -hwscan
  • xawtv -remote -noxv -c /dev/video0 -vbidev /dev/vbi0

4. Test overlay mode (capture card controls display -- easy on CPU)

  • xawtv -noxv -capture overlay
  • xawtv -v4l1 -capture overlay
  • xawtv -xvtv -capture overlay
  • xawtv -xvtv_overlay on -capture overlay
  • xawtv -xvtv_overlay off -capture overlay

5. Test grabdisplay mode (application controls display -- required for deinterlacing and other effects)

  • xawtv -noxv -capture grabdisplay
  • xawtv -v4l1 -capture grabdisplay
  • xawtv -xvtv -capture grabdisplay
  • xawtv -xvtv_overlay on -capture grabdisplay
  • xawtv -xvtv_overlay off -capture grabdisplay

6. Test streamer

  • streamer -i "S-Video Input"

7. Determine the characteristics of a recorded video file

  • mplayer -vo dummy -identify <filename> 2>&1 | grep -E "VIDEO:|AUDIO:"

You can put this into a script and for instance call it reveal:

mplayer -vo dummy -identify $1 2>&1 | grep -E "VIDEO:|AUDIO:"

Now you can issue "reveal <filename>" and see something like this:

VIDEO:  [h264]  576x432  24bpp  29.970 fps  495.5 kbps (60.5 kbyte/s)
AUDIO: 32000 Hz, 2 ch, s16le, 64.0 kbit/6.25% (ratio: 8000->128000)

This command also gives you details:

  • tcprobe -i <filename>

However, at this point (transcode 1.0.2) it doesn't show you video bitrates.