All MIME types supported by MediaRecorder in Firefox and Chrome?

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I’ve not seen any sort of comprehensive list yet for Firefox but I have managed to find something (via a post on the MediaRecorder API from Google’s web updates section) that links to this test set that seems to shed some light on things.

Essentially, it looks like the following are (at time of writing) accepted MIME types for video/audio in Chrome:

  • video/webm
  • video/webm;codecs=vp8
  • video/webm;codecs=vp9
  • video/webm;codecs=vp8.0
  • video/webm;codecs=vp9.0
  • video/webm;codecs=h264
  • video/webm;codecs=H264
  • video/webm;codecs=avc1
  • video/webm;codecs=vp8,opus
  • video/WEBM;codecs=VP8,OPUS
  • video/webm;codecs=vp9,opus
  • video/webm;codecs=vp8,vp9,opus
  • video/webm;codecs=h264,opus
  • video/webm;codecs=h264,vp9,opus

  • video/x-matroska;codecs=avc1

  • audio/webm

  • audio/webm;codecs=opus

(EDITED 2019-02-10: Updated to include brianchirls’ link find)

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