Mats Peterson <matsp888-at-yahoo....@ffmpeg.org> skrev: (11 mars 2016 10:07:06 CET) >Hendrik Leppkes <h.lepp...@gmail.com> skrev: (11 mars 2016 09:18:43 >CET) >>On Fri, Mar 11, 2016 at 5:10 AM, Mats Peterson >><matsp888-at-yahoo....@ffmpeg.org> wrote: >>> >>> Regarding the biClrUsed field, I'm setting it to 1 << >>> bits_per_coded_sample if palettized video, since setting it to 0 is >>> another case where it won't work with Windows Media Player and >>Microsoft >>> Video 1 in 8 bpp mode. >>> >> >>This is not "spec compliance" then, because the spec specifically says >>that when its 0, it should be assumed equal to 2^biBitCount, which is >>the same value you are explicitly writing now. >>Its a redundant value to work around the inability of some players, >>not spec compliance - the existing value is perfectly compliant. >>Please clarify as much in any potential commit message. >> >>- Hendrik >>_______________________________________________ >>ffmpeg-devel mailing list >>ffmpeg-devel@ffmpeg.org >>http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > >I know all that, Hendrik, but the fact is Windows Media Player will not >interpret 0 as 256 either for Microsoft Video 1 (CRAM) or RLE4/8. And >the way I interpret the specs is that using 0 is only relevant to raw, >uncompressed video. > >Mats >-- >Mats Peterson >http://matsp888.no-ip.org/~mats/ >_______________________________________________ >ffmpeg-devel mailing list >ffmpeg-devel@ffmpeg.org >http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
Or I should rather say Windows Media Player doesn't interpret 0 as 1 << bits per sample in those cases. -- Mats Peterson http://matsp888.no-ip.org/~mats/ _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
