Re: [mpeg2-dev] Fwd: Re: [RFC] [PATCH] ARM Advanced SIMD motion compensation

[Måns R. <ma...@ma...>]

Rémi Denis-Courmont <re...@vi...> writes:

> On Fri, 18 Sep 2009 15:25:11 +0100, Måns Rullgård <ma...@ma...> wrote:
>> I have compared FFmpeg against libmpeg2 myself, and FFmpeg on ARMv7 is
>> about 1.5x faster than libmpeg2.  If your experience with VLC is to
>> the contrary, there must be a problem in VLC.
>
> Upon closer inspection, it does seem that raw ffmpeg is around 50% faster
> indeed, if NEON support is enabled. With VLC however, FFMPEG MPEG2 decoding
> is horribly jittery - freezing every so often. I do not know why, and I
> have neither time nor skills to investigate this.

I offered to help you, but I can't without that oprofile data...

> Anyway that's orthogonal to optimizing libmpeg2.

True.  However, instead of writing it all from scratch, and
inefficiently, I suggest you reuse the code from FFmpeg.

-- 
Måns Rullgård
ma...@ma...