[FFmpeg-devel] QTRLE encode performance

Alex Beregszaszi alex at rtfs.hu
Fri Feb 8 21:25:43 CET 2013


On 08/02/2013 20:09, Alexis Ballier wrote:
>> So I'm interested contributing and speeding this up. Before I get started
>> does anyone have any insight they can share on the current state of the
>> encoder? For example:
>> 1. Do we know how the quicktime encoder is so fast? Is it using some sort
>> of hardware feature in windows?
> I don't know the quicktime encoder, but you should probably check the
> filesize for the same color depth: ffmpeg's qtrle encoder is optimal
> (in terms of output size), so it's likely a non-optimal heuristic is
> much faster.
If it is technically possible it would be nice to change qtlreenc to use 
ff_rle_encode and optimise/multithread the latter to benefit other 
encoders using RLE.


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