[FFmpeg-devel] [PATCH 1/4] h261, h263 decoders: convert to RL_VLC.

[Reimar Döffinger]

On Sun, Aug 31, 2014 at 05:44:09PM +0200, Michael Niedermayer wrote:
> On Sun, Aug 31, 2014 at 04:48:41PM +0200, Reimar Döffinger wrote:
> > Some additional optimizations in following patch.
> 
> what effect on speed do these patches have ?

With high error bars, with vsynth1 file, median of 3 runs, only around
changed code:
h261:
4447 decicycles in a, 65532 runs, 4 skips
to
3894 decicycles in a, 65534 runs, 2 skips

h263:
5072 decicycles in a, 65532 runs, 4 skips
to
3502 decicycles in a, 65533 runs, 3 skips

h263p:
5257 decicycles in a, 65533 runs, 3 skips
to
7880 decicycles in a, 65532 runs, 4 skips

flv:
5291 decicycles in a, 65532 runs, 4 skips
to
3609 decicycles in a, 65531 runs, 5 skips

Did not test the pure RL_VLC without optimizations.
I guess the H263P one really doesn't like the close and reopen (?)