[haiku] Re: Haiku on 48 cores?
- From: Zenja Solaja <solaja@xxxxxxxxx>
- To: haiku@xxxxxxxxxxxxx
- Date: Tue, 9 Mar 2010 20:09:27 +0100
I dont know about ffmpeg, but libtheora allows you to specify the number of
threads to do video frame decoding - essentially, there is a pool of decoded
read-ahead frames, and a specific number of threads fill a pool buffer,
which are consumed by the player. Libtheora has found a sweet spot of 15
read-ahead frames. For a HD project I worked on (libtheora fills OpenGL
texture buffer), 2 threads were more than adequate at decoding 1920x1080
video without dropped frames. As a mater of fact, the CPU time spent on
decoding the Theora encoded video (30 frames per second) was so low, that I
was still able to get >3000 fps consistantly with VSYNC off (obviously the
commercial product has VSync On). Decoding is not a problem (for Theora) -
but with newer codecs, things may change.
Zenja
On Tue, Mar 9, 2010 at 2:36 PM, François Revol <revol@xxxxxxx> wrote:
> Now about what to show, dunno, you might have a look at ffmpeg, they
> have some support for threaded video decoding, though I'm not sure our
> Media Kit wrapper supports it yet.
>
> François.
>
>
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