video/av1

A codec masquerading as a media type: video/av1 is registered by the Alliance for Open Media strictly for RTP streaming, and there is no such thing as an .av1 file to serve. AV1 video on disk or over HTTP travels inside MP4, WebM, or Matroska, where the type is the container's and the codec is declared in the codecs parameter (video/mp4; codecs="av01.0.05M.08"). No signature, because an RTP payload has no file header — if you think you need to sniff for AV1, you are actually sniffing for its container.

mime-db lists no extensions — by design, since AV1 never appears as a bare file.

Defined by AV1 RTP payload format (AOM) · IANA registration. Registry facts from the IANA media-types registry via mime-db.