[FFmpeg-devel] [PATCH] faster vp6 decoding

Aurelien Jacobs aurel
Tue Feb 10 14:42:13 CET 2009

Sebastien Lucas wrote:

> On Tue, Feb 10, 2009 at 1:14 AM, Aurelien Jacobs <aurel at gnuage.org> wrote:
> > I've slightly modified your patch (see attached):
> >  - uses a vp6dsp_mmx.c file
> >  - some cosmetics (no trailing whitespace, etc...)
> >  - gcc 2.95 compat: you can't do for(int i=....)
> >  - rough attempt at x86_64 compatibility
> >
> > Unfortunately it don't work (totally garbled output), but I've only
> > tested it on x86_64.
> I tested further, mplayer (latest svn vanilla build) don't manage to
> decode properly my vp6 sample (it was working fine 1 month ago). So I
> build ffmpeg, applied your modified patch and using -f framecrc (only
> ssh access to my dev computer for now) I get 17 frames with changed
> CRC out of the 2611 frames of my sample (I was previously testing only
> the first 1000 frames with mplayer and there was no difference).
> Logically there should be no difference at all.
> But the "totally garbled output" you see could (~should~) be due to
> x86_64. Can you point me the sample you used ?

(Any sample in the same directory should do too)


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