4 ms·

Opus is the standard audio codec in WebM, alongside VP9 or AV1 video.

• prvc 6y ago
  AV1 does not appear to have been added yet
  • prvc 6y ago
    ... as far as this source is concerned at least: https://www.webmproject.org/docs/container/#video-codec https://www.webmproject.org/docs/container/#video-codec
• p1mrx 6y ago
  It's one of the WebM audio codecs; Vorbis was first.
  • xellisx 6y ago
    Thinking about it, I got confused and was thinking about Vorbis. D'oh!