[FFmpeg-devel] [PATCH] faster vp6 decoding

Sebastien Lucas sebastien.lucas
Tue Feb 10 09:48:56 CET 2009

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 ?

Anyway my patch needs a little more work. I'll get back as soon as
it's tested enough.

Thanks for your help with the configure part.


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