Correction:  Should have been

v4l2-ctl  -c audio_later_ii_bitrate=13

not 'v4l-ctl...'

FYI:

I have a PVR-150 running on an old Dell Optiplex (no PCIe, just PCI).
I had no problems until upgrading to the lastest ivtv driver, and
published firmware and the lastest mythtv stable on Debian Etch
(2.8.18).   previously I was using the same version of linux, but with
the previous stable mythtv and the ivtv drivers published about one year
ago.

After the 'upgrade', the tinny or fuzzy or scratchy audio on the PVR-150
(and apparently the 500, a dual 150) would set in randomly, with a bias
toward every other scheduled audio recording.   The problem is not in
playback, the distortion is encoded in the mpeg stream, it is an input
issue.  In my case the input is the s-video input and the RCA left/right
audio.  I've proven (by hotwiring the audio leads to a separate
amp/speaker setup) the supplied audio is clear into the PVR150.  I can
make the problem appear at will by playing new pvr-150 sourced mpeg
files and disappear by playing ones recorded before the upgrade with no
changes to the audio - out playback setup.  (same card as source, same
resolution, etc, etc.)

But I've found a sort-of fix

v4l2-ctl  -c audio_later_ii_bitrate=13

Of some interest -- the rate listed was already at 13.   Somehow the
pvr-150 just began to encode audio at a very low rate.   Actually
setting the rate to any legal value at all restores normal audio.

Harry



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