On Thu, 2010-02-18 at 03:37 +0900, David Pimentel wrote:
> Hello! I just upgraded from Ubuntu 9.04 to 9.10 and the audio capture
> from my PVR is... missing.
> It isn't muted; it's not a problem with pulseaudio or alsa; i don't
> think it's vlc (the only player that seems to be compatible) and
> there's definetly an audio signal coming in.
> Oddly, I can't find the controls for volume or stereo mode anymore
> ('stereo mode extension' control does appear) with v4l2-ctl -l
> What bothers me most is that no audio stream is produced at all (ie
> it's not on low volume--there is absolutely no audio coming out of the
> card).
>
> Information:
> Driver: ivtv 66561 (aka 1.4.1?)
> Card: I/O Data G-MVP/RX
Please provide the output of
$ v4l2-ctl -d /dev/video0 --log-status
when capturing.
Also please try to capture and playback the raw PCM stream when
capturing:
$ cat /dev/video24 > foo.pcm
^C
$ aplay -f dat < foo.pcm
Playing raw data 'stdin' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
If foo.pcm has data that looks like this:
$ xxd foo.pcm
0000000: 0000 0000 0000 0000 0000 ffff ffff ffff ................
0000010: ffff ffff 0000 0000 0000 ffff 0000 0000 ................
0000020: ffff 0000 0000 0000 ffff ffff 0000 ffff ................
0000030: ffff 0000 ffff 0000 0000 ffff 0000 ffff ................
0000040: ffff ffff 0000 0000 ffff 0000 0000 ffff ................
0000050: ffff ffff ffff 0000 ffff 0000 0000 0000 ................
0000060: ffff 0000 0000 0000 0000 0000 ffff 0000 ................
0000070: ffff 0000 0000 0000 0000 0000 0000 0000 ................
0000080: 0000 0000 ffff 0000 0000 0000 ffff 0000 ................
then you are capturing "silence" (I think), and I'll try to look into
what might be wrong.
If you have "non-silence" data in foo.pcm, then it is a sound playback
problem.
Regards,
Andy
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