[mythtv-users] A/V Sync issues in recorded programs from PVR-500/PVR-350

[Brad Benson]

For the past several weeks I've been getting A/V sync issues in some (but 
not all) recordings from my myth box. It was working great for over a year 
with just a single 350 doing recording. I added a 500 to the system and that 
was also functioning well for several months. Over that time I was using 
various versions of the ivtv driver from 0.3.2 up through 0.3.6w. I finally 
settled on running 0.3.6w and that was working for about 2-3 months with no 
problems. Suddenly, out of the blue one day, I noticed a few recordings with 
A/V sync issues. It appears that, at some random point during the recording, 
a small piece of video is missing but the audio is fine. This causes the 
video to be slightly ahead of the audio (anywhere from <1 to about 2 
seconds). At the time I noticed this I hadn't made any recent changes to the 
system.

Since this started I have discovered that one of the tuners on the PVR-500 
is bad. I got that card replaced by Hauppage and, as of last week, installed 
the replacement 500. I was hoping that maybe the bad card had something to 
do with the issues I'm seeing, but last night I found another recording with 
the exact same issue. I need to go through and check the log files when the 
recording is happening, but it's been difficult to determine exactly when 
things were recorded and on which tuner. 

I know I haven't provided much information as I'm not at home at the moment, 
but I can provide any log files that might be helpful in looking into this 
problem. Has anyone seen similar sync issues on recordings? Oh, these are 
straight MPEG2 directly from the card, no transcoding is being done, only 
commercial flagging. Of the 8-12 recordings a day from my myth box I tend to 
see this problem on anywhere from 0 to 3 or 4 of the shows. I'm now running 
ivtv 0.3.8 and still seeing the exact same behavior.

Any insight anyone might have is greatly appreciated.

Brad Benson
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