- Extension
- .opus
- .m4r
- Format
- Binary
- Binary
- Category
- Audio
- Audio
- Developer
- Xiph.Org
- Apple Inc.
- Description
- An OPUS file is an audio file created in the Opus format (also called "Ogg Opus"), a lossy audio format developed for Internet streaming. It uses both SILK (used by Skype) and CELT (from Xiph.Org) codecs and supports variable bit rates from 6 kb/s to 510 kb/s.
- M4R is an iTunes ringtone file that stores mono channel audio. They are identical to the M4A format files only that they are correctly used for ringtones.
- MIME Type
- audio/opus
- audio/x-m4r
