V4L TV Viewing: Difference between revisions
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The following provides commands for adjusting common configuration settings for a [[What is V4L or DVB?|V4L device]]; which are useful for, say, enhancing the end user's experience while watching analogue TV or webcam viewing. |
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The following provides a list of applications for watching analogue TV and commands for adjusting common configuration settings. |
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==Applications for watching Analogue TV== |
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* [http://fftv.sf.net fftv] -- tv/radio viewer/recorder -- [http://sourceforge.net/project/showfiles.php?group_id=71197 sourcecode] |
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* [http://www.kdetv.org kdetv] -- for the KDE desktop -- [http://websvn.kde.org/trunk/extragear/multimedia/kdetv sourcecode] |
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* [[MPlayer]] [http://www.mplayerhq.hu] -- the movie player |
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* [http://tvtime.sourceforge.net tvtime] -- high quality video for Linux -- [http://tvtime.sourceforge.net/usage.html user manual] |
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* [http://www.videolan.org/vlc/ VLC] -- media player and streaming server |
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* [http://linux.bytesex.org/xawtv/ xawtv and motv] -- original TV viewers for bttv by Gerd Knorr |
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* [http://xawdecode.sourceforge.net/ XdTV] -- XdTV is a software that allows you to watch record & stream TV [http://sourceforge.net/project/showfiles.php?group_id=67268 sourcecode] |
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* [http://xinehq.de xine] -- a multimedia player that also reads from v4l devices |
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* [http://zapping.sourceforge.net zapping] -- for the Gnome desktop |
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==Common configuration and control commands== |
==Common configuration and control commands== |
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:a. v4lctl (part of the [[Xawtv#Associated_Utilities|xawtv package]]) |
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:* v4lctl -c /dev/video1 list |
:* v4lctl -c /dev/video1 list |
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:* v4lctl setnorm ntsc-m |
:* v4lctl setnorm ntsc-m |
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:* v4lctl -c /dev/video2 contrast "45%" |
:* v4lctl -c /dev/video2 contrast "45%" |
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:* v4lctl -c /dev/video0 color "50%" |
:* v4lctl -c /dev/video0 color "50%" |
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:b. [http://www.vanheusden.com/dov4l2/ dov4l2] |
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:* Console tool that sets the parameters of a Video4Linux-device |
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:* You can set picture size, brightness, contrast, tuner frequency, and so on. |
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:* You can also retrieve a complete list of all current settings. |
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==Test the video== |
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3. Test the video |
3. Test the video |
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Latest revision as of 03:37, 1 October 2011
The following provides commands for adjusting common configuration settings for a V4L device; which are useful for, say, enhancing the end user's experience while watching analogue TV or webcam viewing.
Common configuration and control commands
1. v4l2ucp -- universal control panel for v4l2 devices
2. Command-line control the V4L device
- a. v4lctl (part of the xawtv package)
- 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%"
- b. dov4l2
- Console tool that sets the parameters of a Video4Linux-device
- You can set picture size, brightness, contrast, tuner frequency, and so on.
- You can also retrieve a complete list of all current settings.
Test the video
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.