[MPlayer-users] Capture tv using mencoder but no sound.

[Mike Holland]

On Tue, 3 Dec 2002, Per Mellander wrote:

> I didn't get any audio stream grabbing via the analog connection so I started 

you mean from your sound card, /dev/dsp?
Try changing your mixer settings. Are you recording from the 'Line' input?

> to try with btaudio. I have inserted the module with the debug=1 option.

I have tried without success to record from btaudio with my Pixelview 
PlayTVpro card.  /dev/dsp1 gives no output, dsp2 gives silence.

> mencoder -tv 
> on:driver=v4l:device=/dev/video0:width=384:height=288:channel=46:adevice=/dev/
> dsp1 -o /tmp/output.avi -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=900 -oac 
> mp3lame -lameopts cbr:br=32 -endpos 00:00:01 -v

Why dsp1? Tried dsp2? 
 
> Unknown/missing audio format -> no sound

That would be consistent with what I (dont) get from btaudio/dsp1 .
What does sox report from dsp1 ?

> Which should mean that the audio is muted. But whatever I try it remains 
> muted. I can do a:

Muting shouldnt affect recording, if you are using the right line. Its for 
output.

> sox -w -r 32000 -t ossdsp /dev/dsp2 -t ossdsp /dev/dsp
> 
> and hear the sound from the tv card.

Why dsp2 here but not before? Whats the difference between the "analog" 
and "digital" btaudio dsp devices?

> I've tried a lot of aumix -d /dev/mixer1 options to set the volume etc. It 
> reports three different line objects, Line1 to Line3 which are unmuted but 
> with volume set to zero at 'modprobe' time. Is there another way of setting 
> the mixer values.


-- 
        The origin of Truth is Doubt - Socrates