[Ffmpeg-devel] [REQUEST] MMX/MMX2 and SSE optimizations for H.264 decoding

Diego Biurrun diego
Fri Sep 16 20:59:06 CEST 2005

On Fri, Sep 16, 2005 at 02:26:06PM +0200, Martin Boehme wrote:
> Diego Biurrun wrote:
> >
> >Some time ago I tried a few HD trailers from apple.com on my 1.5Ghz
> >PowerBook under OS X.  They all played fluently with QuickTime, while
> >MPlayer was playing little more than a slideshow.  I'd guess a factor of
> >2-10, but this was some time ago, I'd have to check again.
> This was for all resolutions?

I played the serenity trailer, which is 1280x544 H.264 video with AAC sound.

> A while ago, I tried some of the Apple trailers under MPlayer on my 1.6 
> GHz Pentium M. My (hazy) recollection is that the 960x540 trailers 
> played at full speed, the 1280x720 were slightly slower than real time, 
> and I think I didn't even try 1920x1080.

A typical MPlayer status line while playing the movie is

A: 108.9 V:  92.0 A-V: 16.960 ct:  3.132 766/766 121% 48%  8.7% 734 0

top shows 2-8% idle processor and the movie plays in slow-motion with
massive audio and video desync.  With QuickTime I have 10-20% idle
processor and absolutely fluent motion.


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