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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?

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

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

libvpx is a video encoder (or codec) which outputs the VP8 or VP9 video formats. Another encoder example is x264 which outputs the H.264 video format.

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    Note that codec can typically be put in multiple containers, and a container can typically accept multiple codecs.
    – Gyan
    May 10, 2019 at 5:12
  • Since I don't do video work frequently, I always forget this important distinction. I wish I had a cheat-sheet showing what goes with what.
    – Lonnie Best
    Aug 10, 2019 at 17:02
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    @LonnieBest Comparison of video container formats might be helpful.
    – llogan
    Aug 19, 2019 at 17:33

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