[mythtv-users] mythbackend random high cpu usage

Michael T. Dean mtdean at thirdcontact.com
Sun Sep 18 22:52:27 UTC 2011

On 09/18/2011 06:14 PM, Jeremy Green wrote:
> 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.

Not just CPU frequency scaling?


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