[MPlayer-dev-eng] [PATCH]Add support for CoreAVC h264 codec

[Luca Barbato]

Michael Niedermayer wrote:

> could you post benchmarks with h264 videos with various parameters with
> coreavc and ffh264? that should be VERY usefull to find out which parts are
> faster then ffh264 which could then help to improve ffh264
> 
> things to test
> * low resolution where all reference frames+1 _easily_ fit in the L2 cache
> * CABAC / CAVLC
> * high bitrate / low bitrate
> * intra only
> * B frames vs. no B frames
> * loop filter / disabled loop filter
> 

Please also use oprofile (latest release/cvs) or equivalent tools,
recently I started digging a bit and looks like that:

for G4 you spend 23% memcpying data (equally balanced smallcopys and
bigcopys, I implemented a naif smallcopy and I shaved 1/25 of the time)

for G5 you spend nearly 10% of the time (the glibc in gentoo includes G5
specific improvements over standard memcpy)

I guess we could move the discussion on ffmpeg-devel (a patch with the
smallcopys is available but quite dirty)

lu