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

[Guillaume POIRIER]

Hi,

On 10/5/06, Luca Barbato <lu_zero at gentoo.org> wrote:
> 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)

Alternatively, can decoding be done without so much mem copies?


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

Could you point me out the G4 and G5 memcopy routines? x264 could
probably benefit from this, as currently on PPC the copy is really a
trivial implementation.

Guillaume
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