- Extension
- .ac3
- .m4r
- Format
- Binary
- Binary
- Category
- Audio
- Audio
- Developer
- Dolby Laboratories
- Apple Inc.
- Description
- Audio file saved in the AC-3 (Dolby Digital) audio format; can include up to six channels of audio (DD 5.1 surround sound with subwoofer output); uses lossy compression and often used as the format for DVDs, cinema theaters, and game consoles.
- 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/ac3
- audio/x-m4r
