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The MediaStream can be from:

  • A getUserMedia() call.
  • The receiving end of a WebRTC call.
  • A screen recording.
  • Web Audio, once this issue is implemented.

For options it’s possible to specify the MIME type and, in the future, audio and video bitrates.

MIME types have more or less specific values, combining container and codecs. For example:

  • audio/webm
  • video/webm
  • video/webm;codecs=vp8
  • video/webm;codecs=vp9