[mythtv-users] Video jitter possibly cased by low cpu usage

Marius Schrecker marius.schrecker at lyse.net
Mon Dec 16 11:07:05 UTC 2013


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Hi,

    After recenrt updates (I'm not sure what) I'm noticing slightly more jerkyness and jitter on some videos and (possibly unrelated) wandering audio sync on others.

System is a dual core opteron with nvidia 620 video adapter doing vdpau rendering and jitterometer tells me that when playing affected  full 1080 at 25p  content frame rate varies at +- 1-2 Hz of 25 and both CPU cores are running at around 15% capacity.
One of my recent changes was upgrading the Nvidia driver from 304 to 310 and google tells me that teghre was a substantial performance increase bertween these two drivers. Something that might be causing my CPU usage and bus speed to drop so much that I'm getting throughput errors.

What's the best way to test the hypothesis?

Cheers!

Marius


 


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