[FFmpeg-devel] 10 bit hevc on ppc

Carl Eugen Hoyos cehoyos at ag.or.at
Mon Jun 2 12:07:07 CEST 2014


Hi!

10 bit hevc is not bitexact on ppc, output is 
visually ok.
I made the following observations:
* Reproducible on 32 and 64 bit ppc
* Reproducible on different operating systems
* Not a regression, reproducible with c8dd048a
* Reproducible with -O0
* Reproducible with --disable-optimizations
* Reproducible with --disable-altivec
* Reproducible with and without gas-preprocessor
* Reproducible with old (4.0) and new gcc (4.8)
* Not related to the missing definition of 
  UNCHECKED_BITSTREAM_READER
* Bitexact on ppc for all tested environments

I don't have any other ideas.

Carl Eugen



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