[vlc-devel] [PATCH 01/23] contrib: libmpeg2 simplistic NEON acceleration for motion compensation

[Måns Rullgård]

"Rémi Denis-Courmont" <remi at remlab.net> writes:

> Le samedi 3 octobre 2009 20:58:45 Rafaël Carré, vous avez écrit :
>> Le 03/10/2009 19:52, Rémi Denis-Courmont a écrit :
>> > ---
>> >  extras/contrib/src/Makefile                       |    2 +
>> >  extras/contrib/src/Patches/libmpeg2-mc-neon.patch |  385
>> > +++++++++++++++++++++ 2 files changed, 387 insertions(+), 0 deletions(-)
>> >  create mode 100644 extras/contrib/src/Patches/libmpeg2-mc-neon.patch
>> 
>> I think libmpeg2 is now unmaintained, so this is ok.
>> 
>> Did you bench ffmpeg mpeg2 decoder against this patched libmpeg2 ?
>
> Plain FFmpeg is about 50% faster than plain libmpeg2, and 25% than
> libmpeg2 with this patch. But VLC with FFmpeg is noticeably slower
> than both. I have no idea why (my kernel does not support oprofile),
> though Laurent hinted it could be due to the up-front MPEG2
> packetizer.

Is it impossible for you to obtain an oprofile-enabled kernel?

-- 
Måns Rullgård
mans at mansr.com