[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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