[mythtv-users] ffmpeg and multiple CPUs. Was: Should I be switching to 0.21?

Yan Seiner yan at seiner.com
Mon Apr 14 17:36:20 UTC 2008

Phil Bridges
> On Mon, Apr 14, 2008 at 1:07 PM, Tom Dexter <digitalaudiorock at gmail.com>

>>  However...and this is the interesting part...if I use ffmpeg but
>>  switch the number of CPUs to 1 instead of 2 the performance of the two
>>  is virtually identical.  It seems that, at least with my
>>  hyper-threaded 3 Ghz P4, ffmpeg works much better with a single core.
> That is interesting.  I wonder if the same applies for AMD chips?
> IIRC, the on-screen documentation recommends not using libmpeg2 with
> 64-bit processors, but I may be incorrect.

I've played a bit with ffmpeg as a standalone package.  ISTR that
threading is only enabled if the codec supports it; I don't think mpeg*
supports threading with ffmpeg.

Windows is like a canary in a coal mine, it's the first thing to die on
your network.

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