On Sun, Apr 2, 2017 at 10:33 PM, Christina Brien <christina.br...@polygonindustrial.com> wrote: > Hi > > Having written a clean-room implementation of H.261 and comparing it to the > output of FFMPEG, I have found that FFMPEG is not spec-compliant with regard > to negative chroma motion vectors. The spec states that chroma motion vectors > are the luma motion vectors divided by two, and rounded *towards zero*. > FFMPEG currently rounds towards negative infinity. > > This patch makes FFMPEG compliant, but breaks the regression tests. >
C integer divison truncates, that equals rounding towards zero. - Hendrik _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
