[mythtv-users] mythbackend random high cpu usage
jrgreen at MIT.EDU
Sun Sep 18 22:14:58 UTC 2011
I am running MythTV 0.24.1 on Fedora 14, on a computer with a pcHDTV 5500 tuner,
1.8GHz Core 2 Duo, and 2GB memory. For analog channels, the card is a
framegrabber and my recording profiles are set to encode MPEG-4.
When recording of an analog channel starts, one of the following two things
happens, seemingly at random:
1. mythbackend uses around 50% of one core, and the recording is fine.
2. mythbackend CPU usage is around 120% (and one of the threads is around 90%).
Usually audio sync in the recording is bad, and becomes worse over time (toward
the end of a 30 minute recording, audio sometimes lags a few seconds behind the
video). Sometimes a recording will have a few instances where about a second of
audio repeats itself.
If a recording starts with high CPU usage, and I stop and restart it a few
times, I am able to cause it to switch to the low CPU usage behavior.
Any help would be appreciated, as this is obviously quite annoying.
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