The ffmpeg manual states that:

libvpx-vp9 is the VP9 video encoder for ​WebM, an open, royalty-free media file format.

What is the difference between the VP9 and WebM?


VP9 is a video format. Another example is H.264.

WebM is a container format that VP9 goes into. It is equivalent to MP4 for H.264 video.

  • 2
    Note that codec can typically be put in multiple containers, and a container can typically accept multiple codecs. – Gyan May 10 at 5:12

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