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

[Tom Dexter]

On Mon, Apr 14, 2008 at 3:58 PM, Jay R. Ashworth <jra at baylink.com> wrote:
> On Mon, Apr 14, 2008 at 01:07:39PM -0400, Tom Dexter wrote:
>  > 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.
>
>  Since, with Hyperthreading, you only actually *have* one processor, I
>  would expect it even to be a little more efficient with 1 instead of 2,
>  since you save the labor of partitioning the task.
>
>  Cheers,
>  -- jra
>  --
>  Jay R. Ashworth                   Baylink                      jra at baylink.com
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Yup...as a matter of fact I was just trying libmpeg2 with only one
rather than two and it improves as well, though only slightly.

Tom