It is indeed an FFmpeg issue (latest git-master) and can be reproduced by encoding a webm file with transparent background to an animated webp file file via e.g. Video:41kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown You may want to consider passing in YUV instead for lossy encoding.įrame= 37 fps=0.0 q=-0.0 Lsize= 41kB time=00:00:01.80 bitrate= 187.6kbits/s speed=14.4x Using libwebp for RGB-to-YUV conversion. Ffmpeg version N-93933-geae251ead9 Copyright (c) 2000-2019 the FFmpeg developersĬonfiguration: -enable-gpl -enable-version3 -enable-sdl2 -enable-fontconfig -enable-gnutls -enable-iconv -enable-libass -enable-libdav1d -enable-libbluray -enable-libfreetype -enable-libmp3lame -enable-libopencore-amrnb -enable-libopencore-amrwb -enable-libopenjpeg -enable-libopus -enable-libshine -enable-libsnappy -enable-libsoxr -enable-libtheora -enable-libtwolame -enable-libvpx -enable-libwavpack -enable-libwebp -enable-libx264 -enable-libx265 -enable-libxml2 -enable-libzimg -enable-lzma -enable-zlib -enable-gmp -enable-libvidstab -enable-libvorbis -enable-libvo-amrwbenc -enable-libmysofa -enable-libspeex -enable-libxvid -enable-libaom -enable-libmfx -enable-amf -enable-ffnvcodec -enable-cuvid -enable-d3d11va -enable-nvenc -enable-nvdec -enable-dxva2 -enable-avisynth -enable-libopenmptĭuration: 00:00:02.00, start: 0.000000, bitrate: 70 kb/s

Ffmpeg convert animated webp to gif