William Powers wrote:
While you're thinking about it, any idea what might cause recordings
with clipped audio at low volume from a cx25840? After the previous
patch to add the cx25840 volume control was added, the volume of
recordings on my PVR-500 was cut way down (ie., no longer overdriven),
but I still would get an occasional recording (one very couple days)
with garbled audio. The audio sounded clipped, even though the volume
was low, and looking at the audio track with Audacity confirmed that
the peaks were all sawed off.
I reverted back to 0.3.2w yet again, which never gives me any
problems. I'd be happy to troubleshoot or try solutions, if I had a
clue what might be helpful.
That's a very good question. I know that the cx25840 has a soft
clip mechanism which runs independant of the volume controls (and the
automatic volume control AVC). I wouldn't think it would cut things at
low volume unless something else was going wrong though. I doubt
there's anything awry, but you may want to check the path1 soft clip
controls:
cx25840ctl -d /dev/videoX -l | grep PATH1_SC
Should be
RMS_CON=3
CR=2
STEREO=1
AT=3
RT=3
THRESH=32767
If that's all well and good, maybe try getting a post-volume-patch
version and changing cx25840_set_v4l_audio (in cx25840-audio.c) so it
just looks like:
{
CX25840_SET_PATH1_VOLUME(0x36);
}
(this will force the volume to +0dB at all times)
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