animated webp images not playing?

[Owyn]

example_95977880_ugoira1920x1080.zip

webpCodec = libwebp webpParam = -lossless 0 -q:v 90 -loop 0 -vsync 2 -r 999

source: https://www.pixiv.net/en/artworks/95977880 encoder: pixivutil2 -> ffmpeg

[sylikc]

I can confirm it doesn't work but can't seem to trace to where it fails.

@KrokusPokus , you did some webp work adding the transparency... would you have a chance to take a look if this is a simple bug or something deeper?

[KrokusPokus]

From what I have seen, webp animation is not implemented in the interface to the external library (webp\webp.cpp) right now, even though functionality seems to be there in the library itself (search demux.h for the term animation and you'll see what I mean).