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Re:Chromium: Add support for Animated PNG by the8472 on Wednesday March 15, 2017 @11:16AM (#13876663)
ffmpeg is not the issue here, it supports several 444/alpha/lossless codecs quite well, proes is not special in that regard.

Browsers only expose a small subset of codecs that ffmpeg supports. gif and apng are now the most compatible format in browsers for this kind of content.

Re:Chromium: Add support for Animated PNG by mzs on Wednesday March 15, 2017 @01:23PM (#13877898)
FourCC of ap4x 'just worked' on IE (I might have installed QuickTime codecs), Safari, and gstreamer with Firefox - it just played in the window (though I did not test alpha channel). I was surprised too ;)