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

[Michael T. Dean]

On 04/14/2008 01:07 PM, Tom Dexter wrote:
> 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's known to occur when enabling >1 CPU with SMT (a.k.a. Intel
HTT(TM)).  As mentioned in other posts in the thread, you should see an
improvement (or, at worst, no significant performance degradation) on a
real multi-core or multi-processor system.

Mike