[FFmpeg-user] Grabbing quality from TV card

[dE .]

On 03/19/12 01:52, tovis wrote:
> Hi!
> I have reach some progress :D
> Some one later suggest to use h264 codec (I think dE.) - I've decided to
> give a chance. I've downloaded and compile x264 library from git (I have
> several pain, because I have to get also latest yasm to compile it with
> appropriate assembler, and also install Debian package autoconf). But the
> result was prove this. I have using command:
>
> $ ffmpeg -v verbose -f video4linux2 -i /dev/video0 -r 29.97 -s 640x480
> -vcodec libx264 \
>   -t 10 -f avi -y /tmp/test01.avi
>
> In result I have resonable good quality of the video stream :D
>
> Next I have tried to get sound. As it suggested in ffmpeg documentation I
> have checked available options for alsa:
> $ cat /proc/asound/cards
>   0 [SB             ]: HDA-Intel - HDA ATI SB
>                        HDA ATI SB at 0xfe024000 irq 16
>   1 [HDMI           ]: HDA-Intel - HDA ATI HDMI
>                        HDA ATI HDMI at 0xfdffc000 irq 19
>   2 [Bt878          ]: Bt87x - Brooktree Bt878
>                        Brooktree Bt878 at 0xfdbfe000, irq 20
>
> $ cat /proc/asound/devs
>    2:        : timer
>    3:        : sequencer
>    4: [ 0- 2]: digital audio capture
>    5: [ 0- 1]: digital audio playback
>    6: [ 0- 1]: digital audio capture
>    7: [ 0- 0]: digital audio playback
>    8: [ 0- 0]: digital audio capture
>    9: [ 0- 0]: hardware dependent
>   10: [ 0]   : control
>   11: [ 1- 3]: digital audio playback
>   12: [ 1- 0]: hardware dependent
>   13: [ 1]   : control
>   14: [ 2- 1]: digital audio capture
>   15: [ 2- 0]: digital audio capture
>   16: [ 2]   : control
>
> I have using command for grabbing:
>
> $ ffmpeg -v verbose -f alsa -ac 2 -i hw:0 -f video4linux2 -i /dev/video0 \
> -r 29.97 -s 640x480 -vcodec libx264 \
> -f avi -y test02.avi
>
> No sound :( I have tried hw:0, hw:1 and hw:2 as input, but nothing.
> I have compile latest mp3lame from sourceforge. No result. But in video
> stream, mp3 track is exist (I have checked on windows using mediainfo)!?
>
> I goes back to check v4l2 facilities. I have list available controls for
> /dev/video0, using command v4l2-ctl (getting from Squeeze repository),
> here is the result:
>
> brightness (int)  : min=0 max=65535 step=256 default=32768 value=32768
> contrast (int)  : min=0 max=65535 step=128 default=32768 value=32768
> saturation (int)  : min=0 max=65535 step=128 default=32768 value=32768
> hue (int)  : min=0 max=65535 step=256 default=32768 value=32768
> balance (int)  : min=0 max=65535 step=655 default=32768 value=32768
> bass (int)  : min=0 max=65535 step=655 default=32768 value=32768
> treble (int)  : min=0 max=65535 step=655 default=32768 value=32768
> mute (bool) : default=0 value=1
> chroma_agc (bool) : default=0 value=0
> combfilter (bool) : default=0 value=0
> automute (bool) : default=0 value=1
> luma_decimation_filter (bool) : default=0 value=0
> agc_crush (bool) : default=0 value=1
> vcr_hack (bool) : default=0 value=0
> whitecrush_upper (int)  : min=0 max=255 step=1 default=207 value=207
> whitecrush_lower (int)  : min=0 max=255 step=1 default=127 value=127
> uv_ratio (int)  : min=0 max=100 step=1 default=50 value=50
> full_luma_range (bool) : default=0 value=0
> coring (int)  : min=0 max=3 step=1 default=0 value=0
>
> Tuner card internal sound output attached to CD input on mainboard for
> onboard audio. I've goes back to "-i hw:0" and start grabbing w/o time
> limit, in other console I have set mute to '0' :
> $ v4l2-ctl --set-ctrl=mute=0
> Sound from TV tuner is up, after several seconds, I have stopped grabbing,
> when ffmpeg step out to shell sound is goes down - I have checked the sort
> clipp - I've got sound :D
>
> Happy? Not yet.
> I need NO sound on the card's host box - I suppose to use it as a stream
> server. The best (for me) if I could get sound from tuner card  directly,
> avoid sound card. I have tried similar procedure using grabbing command:
>
> $ ffmpeg -v verbose -f alsa -ac 2 -i hw:2 -f video4linux2 -i /dev/video0 \
> -r 29.97 -s 640x480 -vcodec libx264 \
> -f avi -y test02.avi
>
> But no success. Is it possible to get sound avoid the sound card? Any
> suggestion?
>
> Sincerely
>    tovis
>
>
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I sort of don't understand your setup.

You capture card connects via USB right? And there's an audio controller 
in the TV card, which alsa recognizes and makes the corresponding devices?