V4L TV Viewing: Difference between revisions
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:* streamer -i "S-Video Input" |
:* streamer -i "S-Video Input" |
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7. Determine the characteristics of a recorded video file |
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:* mplayer -vo dummy -identify <filename> 2>&1 | grep -E "VIDEO:|AUDIO:" |
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You can put this into a script and for instance call it reveal: |
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mplayer -vo dummy -identify $1 2>&1 | grep -E "VIDEO:|AUDIO:" |
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Now you can issue "reveal <filename>" and see something like this: |
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VIDEO: [h264] 576x432 24bpp 29.970 fps 495.5 kbps (60.5 kbyte/s) |
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AUDIO: 32000 Hz, 2 ch, s16le, 64.0 kbit/6.25% (ratio: 8000->128000) |
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This command also gives you details: |
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:* tcprobe -i <filename> |
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However, at this point (transcode 1.0.2) it doesn't show you video bitrates. |
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Revision as of 16:54, 17 April 2006
Applications for watching TV
- fftv] -- tv/radio viewer/recorder -- sourcecode
- kdetv] -- for the KDE desktop -- sourcecode
- MPlayer -- the movie player
- 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
- kaffeine -- a KDE frontend
- 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.