audio/ogg

The Ogg container carrying sound — Vorbis, Opus, Speex, or FLAC streams wrapped in the free container Xiph built when MP3 was patent-encumbered. This is the type for .opus files too: audio/opus exists but is registered only for RTP, so an Opus file served over HTTP is audio/ogg, ideally with codecs=opus so players can commit before downloading. Every Ogg page starts with the OggS capture pattern, making the container easy to sniff even when the codec inside is a mystery.

.ogg means audio by convention since RFC 5334; .oga is the unambiguous audio extension, .opus and .spx name the codec.

Defined by RFC 5334 · IANA registration. Registry facts from the IANA media-types registry via mime-db.