matched as option 'v' (set logging level) with argument '9'. % ffmpeg -v 9 -loglevel 99 -framerate 1 -i input%d.png -lavfi palettegen,paletteuse output.gifįfmpeg version N-93851-gdcc999819d 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-libopenmpt If stats mode is full or diff then only the first frame will remain and be overlapped by each frame. If the stats mode is set as single then all frames will overlap the previous frames. Notice that only the pixels that change from one frame to the next are present.Summary of the bug: Transparent gifs are having frames overlap previous ones. Here’s the first three frames of the gif above. If you want to peak at the internals of a gif, you can use gifsicle -e input.gif to explode the frames. We get a little bit of colour banding, but I think that’s acceptable. This means that the areas without motion will remain the transparent from one frame to the next.įor our longer gifs, this method cut our file size down by about 40%. In our case, since the images were synthetic (i.e., not photographic), dithering using the Bayer algorithm worked quite nicely.ĭiff_mode=rectangle restricts area to only the regions where there is motion.
Have a look a the different options for dithering as they’ll each have a different effect depending on your content. I found that without this, some static pixels would still change colours ever so slightly between frames.ĭithering with a bayer_scale=5. This will generate a smaller palette because FFMPEG will only look at the pixels that do not change from one frame to the next. Using stats_mode=diff when generating the palette. I won’t go into each option we’re passing to FFMPEG here, but there are a couple things that differ from the original blog post. You can find a more detailed explanation of this in FFMPEG’s Filtergraph Docs Explanation of Options
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