On Sunday 17 April 2016 08:41:32 pm Jan Ekstrom wrote: > On Sun, Apr 17, 2016 at 9:21 PM, Reimar Döffinger > > <reimar.doeffin...@gmx.de> wrote: > > In particular, I have an uncomfortable suspicion that > > PGS might be designed to match the movie's colour space, > > in which case neither variant would give correct results > > but instead it would have to depend on what format the > > corresponding video track uses (and it probably would > > be more than just the 255/224 factor that would differ). > > Yes, the YCbCr values in palettes are matched accordingly against the > video stream. As per the specification: > "Y, Cr and Cb shall have the same color matrix as the associated HDMV > Video stream: 525-60/625-50 (Rec.601); 1080i, 720p (ITU-709)" > > Otherwise the specification notes that valid values in palettes are: > -Y: 16-235 > -Cr: 16-240 > -Cb: 16-240 > -Transparency: 0-255, where a value of ‘255’ indicates full opacity > and ‘0’ indicates full transparency. > (Each Palette entry shall have a default transparency value of 0; the > default values of Y, Cr and Cb are undefined.) > > > Best regards, > Jan Ekström > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
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