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17th May 2011, 20:15 | #1 | Link |
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Raw video/audio from PVR-150 to digitize VHS (Linux)
The PVR-150 offers the devices:
/dev/video24 – The raw audio capture device (Read-only) /dev/video32 – The raw video capture device (Read-only) How can I grab from this two channels? Which is the correct ffmpeg command? Thanks mesc |
18th May 2011, 07:59 | #2 | Link |
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My google gave me in 5 seconds the following thread -> http://www.pclinuxos.com/forum/index.php?topic=75805.0
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18th May 2011, 08:28 | #3 | Link |
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This was not my question.
The link you posted describes how to digitize /dev/video0 and not with: /dev/video24 /dev/video32 I know how to do it with /dev/video0 but this is the mpeg-coded signal from the PVR-150. For further editing I would like to have the raw material. |
19th May 2011, 15:59 | #5 | Link |
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I'm getting closer:
1. v4l2-ctl -v width=720,height=480 2. mplayer -rawvideo format=hm12:h=480:w=720:fps=29.97 -nocache -demuxer 26 /dev/video32 -audiofile /dev/video24 -audio-demuxer rawaudio With following message: ######################################################################################### MPlayer 1.0rc4-4.4.5 (C) 2000-2010 MPlayer Team Playing /dev/video32. rawvideo file format detected. rawaudio file format detected. open: No such file or directory [MGA] Couldn't open: /dev/mga_vid open: No such file or directory [MGA] Couldn't open: /dev/mga_vid [VO_TDFXFB] Can't open /dev/fb0: No such file or directory. [VO_3DFX] Unable to open /dev/3dfx. [vdpau] Error when calling vdp_device_create_x11: 1 ========================================================================== Opening video decoder: [hmblck] Hauppauge Macroblock/NV12/NV21 Decoder Movie-Aspect is undefined - no prescaling applied. VO: [xv] 720x480 => 720x480 Planar YV12 Selected video codec: [rawhm12] vfm: hmblck (RAW HM12) ========================================================================== ========================================================================== Opening audio decoder: [pcm] Uncompressed PCM audio decoder AUDIO: 44100 Hz, 2 ch, s16le, 1411.2 kbit/100.00% (ratio: 176400->176400) Selected audio codec: [pcm] afm: pcm (Uncompressed PCM) ========================================================================== waitpid(): No child processes AO: [pulse] Init failed: Internal error Failed to initialize audio driver 'pulse' AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample) Starting playback... A: 3.2 V: 2.7 A-V: 0.494 ct: 0.000 83/ 83 3% 2% 3.6% 50 0 ************************************************ **** Your system is too SLOW to play this! **** ************************************************ Possible reasons, problems, workarounds: - Most common: broken/buggy _audio_ driver - Try -ao sdl or use the OSS emulation of ALSA. - Experiment with different values for -autosync, 30 is a good start. - Slow video output - Try a different -vo driver (-vo help for a list) or try -framedrop! - Slow CPU - Don't try to play a big DVD/DivX on a slow CPU! Try some of the lavdopts, e.g. -vfm ffmpeg -lavdopts lowres=1:fast:skiploopfilter=all. - Broken file - Try various combinations of -nobps -ni -forceidx -mc 0. - Slow media (NFS/SMB mounts, DVD, VCD etc) - Try -cache 8192. - Are you using -cache to play a non-interleaved AVI file? - Try -nocache. Read DOCS/HTML/en/video.html for tuning/speedup tips. If none of this helps you, read DOCS/HTML/en/bugreports.html. A: 3.5 V: 2.9 A-V: 0.533 ct: 0.000 89/ 89 3% 2% 3.4% 55 0 Exiting... (Quit) ######################################################################################### But it works! With time delay between audio and video but it works! But now how to record from here? And how would the command be for ffmpeg? ffmpeg -t 00:00:10 -i /dev/video32 -i /dev/video24 test.raw ffmpeg -t 00:00:10 -f rawvideo -i /dev/video32 -i /dev/video24 -sameq test.raw both doesn't work... |
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