On Wed, May 27, 2015 at 03:10:05PM -0700, Urvang Joshi wrote: > All the frames that the native muxer gets are fully reconstructed > frames,
wrong > and they should not be alpha-blended with the previous frames. > > As per the WebP container spec > https://developers.google.com/speed/webp/docs/riff_container#animation, > ANMF chunk should specify blending method = do not blend (and disposal > method = do not dispose). > > However, the native muxer was wrongly setting blending method = use > alpha blending. > This bug can be reproduced by converting a source with transparency > (e.g. animated GIF with transparency) to an animated WebP, and viewing > it with vwebp. > --- > libavformat/webpenc.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) this breaks the encoder completely the testcase is the same as previously but probably any testcase that enables encoding multi frame animations will do try -cr_threshold 10000 -cr_size 16 for example [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB I have never wished to cater to the crowd; for what I know they do not approve, and what they approve I do not know. -- Epicurus
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