[Ffmpeg-devel] Bug in multithreaded h/x264 encoding

Tuukka Toivonen tuukkat
Tue Jun 21 10:00:56 CEST 2005

On Mon, 20 Jun 2005, Erik Slagter wrote:

> Still it's interesting that the output of the encoder apparently is not
> bit exact regarding to nr of threads.

x264? Yes, not at all, x264 splits frames into as many number of
independent slices as there are threads. Makes parallelization
easy (even for decoding) but hurts a little bit compression

ffmpeg with multiple threads isn't bit exact either, not at all
(even though obviously it doesn't use slices).

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