Variable Bitrate (VBR) Average Bitrate (ABR) VP9 offers different rate control modes, which determine the quality and file size: Note that the default audio encoder for WebM is libopus, but if it is not available libvorbis will be used instead. Note that for 10-bit encoding, you need to set the -enable-vp9-highbitdepth configuration option. To install FFmpeg with support for libvpx-vp9, look at the Compilation Guides and compile FFmpeg with the -enable-libvpx option. libvpx-vp9 can save about 20–50% bitrate compared to libx264 (the default H.264 encoder), while retaining the same visual quality. Libvpx-vp9 is the VP9 video encoder for WebM, an open, royalty-free media file format.
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