[mythtv-users] PVR 350 not capturing audio

[Brian Wood]

On Thursday 15 April 2010 04:39:59 pm Wayne Richards wrote:
> I just built a gentoo system and installed mythtv-0.22.  It has a PVR 350
>  as video0 and a PVR 150 as video1.  I'm not using the TV-out on the
>  350--instead it has a GeForce 7300 with s-video output.
> 
> Testing the PVR 350:
> > cat /dev/video0 > /tmp/test.mpg
> 
> produces the output file, but playing it with mplayer gives:
> 
> MPlayer SVN-r29796-4.3.4 (C) 2000-2009 MPlayer Team
> 
> Playing test.mpg.
> MPEG-PS file format detected.
> MPEG: No audio stream found -> no sound.
> VIDEO:  MPEG2  720x480  (aspect 2)  29.970 fps  6000.0 kbps (750.0 kbyte/s)
> ==========================================================================
> Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
> Could not find matching colorspace - retrying with -vf scale...
> Opening video filter: [scale]
> VDecoder init failed :(
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffmpeg2] vfm: ffmpeg (FFmpeg MPEG-2)
> ==========================================================================
> Audio: no sound
> Starting playback...
> Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
> 
> Testing the PVR 150:
> > cat /dev/video1 > /tmp/test.mpg
> 
> produces the output file, and mplayer reports that it has audio.
> 
> 'uname -a':
> 
> Linux mythtv 2.6.31-gentoo-r10 #16 SMP Tue Apr 13 12:13:57 CDT 2010 x86_64
>  AMD Athlon(tm) II X3 425 Processor AuthenticAMD GNU/Linux
> 
> Here's the output of 'dmesg | grep ivtv':

<deletia>

> I don't have any options set for the ivtv module.  How do I troubleshoot
>  this?

Are you tuning an RF channel or using baseband inputs? I'd try the other 
source, whatever it is.

I've never seen this, even with no audio input. It may be a defective card. 
The stream should be there, even  if it contains no audio.