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Audio problem with PVR500
http://forum.linhes.org/viewtopic.php?f=6&t=19769		 Page 1 of 1
Author:  sgf [ Sat Apr 04, 2009 12:25 pm ]
Post subject:  Audio problem with PVR500
Problem: When playing recordings, the audio is clear, but voices seem to be reduced in volume with respect to background sound and music. FOR certain programs the voices are very hard to hear. Seems as if a frequency band equalization has been applied. I've switched between WatchTV mode and the TV alone to verify it's not my imagination. :)

All recording is via a PVR500. Both channels behave the same way. Playback is via PVR350. (350 recording channel is burned out and disabled.)

NOTE:(!!) The PVR350 audio output goes straight to the TV. No audio processing via the PC/Myth/ALSA. This configuration worked fine in previous versions of Knoppmyth. (I've had it this way to avoid mobo electrical noise on the audio channel.

Anyone else ever had this problem? Any suggestions for how to fix?
Author:  alexfitz [ Sat Apr 04, 2009 1:24 pm ]
Post subject: 
I had the problem with distorted audio on some recordings. I solved it by adding a two files:
resetsound1.sh

sleep 7
v4l2-ctl -d 0 --set-audio-input=0 # shut down the sound for 2 seconds
sleep 2
v4l2-ctl -d 0 --set-audio-input=1 # turn on the sound again.

and resetsound2.sh

sleep 7
v4l2-ctl -d 1 --set-audio-input=0 # shut down the sound for 2 seconds
sleep 2
v4l2-ctl -d 1 --set-audio-input=1 # turn on the sound again.

at the end of my channel change script for tuner 1 I put:

/usr/local/bin/resetsound1.sh &

and a similar change for the second channel change script. Don't forget to chmod the resetsound.sh files.

I can't claim this solution, but don't remember where I found it.
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