On 8/19/20, Jim DeLaHunt <list+ffmpeg-u...@jdlh.com> wrote: > On 2020-08-19 07:34, Paul B Mahol wrote: >> You are deeply confused about our filters. >> Any filter can change pixel formats to one that they accepts thus gbrp >> is picked instead of packed rgb, this is already documented >> implicitly. > > Wow, "documented implicitly". This is such a classic FFmpeg project > statement. The role of documentation is to explain, explicitly, at a > suitable level of detail. What does "documented implicitly" even mean? > > I think this thread points out is that FFmpeg documentation is > inadequate. It is hard to prove a negative, but I suspect that the term > "pixel format" is not actually defined in the FFmpeg documentation. I > suspect that the statement, "Any filter can change pixel formats" is not > stated either. Certainly the maskedmerge filter documentation[1] doesn't > mention pixel formats at all, much less say what pixel formats the > filter sets for its output. > > I have attempted to improve the documentation, to make it explain > explicitly instead of fail to document. I encountered a great deal of > resistance to those patches, because they make the documentation more > explicit, because they have more words, and because documentation has so > little value in this project relative to executable code. > > And yet "You are deeply confused about our filters". In other words, the > documentation has failed to explain to you what FFmpeg does, the project > has failed to write or welcome improved documentation, you do not > understand how FFmpeg works — and somehow this is your fault.
http://ffmpeg.org/ffmpeg-filters.html#toc-Filtergraph-syntax-1 mention it explicitly: Libavfilter will automatically insert scale filters where format conversion is required. It is possible to specify swscale flags for those automatically inserted scalers by prepending sws_flags=flags; to the filtergraph description. > > [1] http://ffmpeg.org/ffmpeg-all.html#maskedmerge > > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
