[FFmpeg-devel] [PATCH] FFV1 rectangular slice multithreading

[Reimar Döffinger]

On Fri, Oct 15, 2010 at 04:23:09AM +0200, Michael Niedermayer wrote:
> On Thu, Oct 14, 2010 at 04:34:50PM -0700, Baptiste Coudurier wrote:
> > On 10/14/2010 04:22 PM, Michael Niedermayer wrote:
> >> On Thu, Oct 14, 2010 at 02:59:31PM +0200, Michael Niedermayer wrote:
> >>> Hi
> >>>
> >>> Following patchset makes ffv1.2 much faster on multiprocessor systems
> >>> (requires version to be set to 2, which needs you to edit the source if you
> >>>   want to try as 1.2 bitstream is not finalized yet)
> >>>
> >>> Compression wise 4 slices with foreman and large gops (300 frames) perform
> >>> slightly better (0.05% IIRC) than 1 slice.
> >>> With small gops (50 frames) compression is worse with the rangecoder and the
> >>> large context model by 0.8% otherwise better too.
> >>> (its quite obvious why its worse in that case and ill be working on that ...)
> >>>
> >>> Comments welcome, bikesheds not, and ill apply this soon
> >>
> >> applied, flame me on svnlog
> >
> > I quickly tested it, very nice speedup, could we get speedup for  
> > decoding too ? It's now encoding faster than decoding :)
> 
> It speeds up decoding too you need new v1.2 bitstreams and you need to put
> -threads x before -i

May I suggest a regression test using all that?