[ivtv-users] CX18 audio

[Andy Walls]

On Thu, 2009-02-12 at 07:36 +0100, . . wrote:
> I'm not sure if a new thread is needed or not.
> 
> In MythTV I can't set the audio sampling rate to anything other than
> 48000 for the NTSC side of the cx18 with v4l-dvb rev 10516. It's not
> that important because I prefer the audio sampling rate to be 48000. I
> noticed this when reading the threads about audio issues because I'm
> looking into the audio buzz/static I'm experiencing.


If you kill the Mythbackend, can you control it with v4l2-ctl ?

I suspect it's a MythTV problem.  Here's when I'm set to the tuner:

$ v4l2-ctl --log-status | grep Audio:
   cx18-0: Audio:  48 kHz, MPEG-1/2 Layer II, 224 kbps, Stereo, No Emphasis, No CRC
$ v4l2-ctl -c audio_sampling_frequency=0
$ v4l2-ctl --log-status | grep Audio:
   cx18-0: Audio:  44.1 kHz, MPEG-1/2 Layer II, 224 kbps, Stereo, No Emphasis, No CRC
$ v4l2-ctl -c audio_sampling_frequency=2
$ v4l2-ctl --log-status | grep Audio:
   cx18-0: Audio:  32 kHz, MPEG-1/2 Layer II, 224 kbps, Stereo, No Emphasis, No CRC
$ v4l2-ctl -c audio_sampling_frequency=1
$ v4l2-ctl --log-status | grep Audio:
   cx18-0: Audio:  48 kHz, MPEG-1/2 Layer II, 224 kbps, Stereo, No Emphasis, No CRC


Here's with using SVideo1: 

$ v4l2-ctl -i1
Video input set to 1 (S-Video 1)
$ v4l2-ctl --log-status | grep Audio:
   cx18-0: Audio:  48 kHz, MPEG-1/2 Layer II, 224 kbps, Stereo, No Emphasis, No CRC
$ v4l2-ctl -c audio_sampling_frequency=2
$ v4l2-ctl --log-status | grep Audio:
   cx18-0: Audio:  32 kHz, MPEG-1/2 Layer II, 224 kbps, Stereo, No Emphasis, No CRC

Regards,
Andy