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| Name | M4A | OGG |
| Full name | M4A - Audio-only MPEG-4 | OGG - Ogg Vorbis |
| File extension | .m4a | .ogg .oga |
| MIME type | video/mp4 | application/ogg, audio/ogg, audio/vorbis, audio/vorbis-config |
| Developed by | International Organization for Standardization | Xiph.Org Foundation |
| Type of format | Media container | Audio compression format |
| Description | MPEG-4 Part 14 or MP4 is a digital multimedia container format most commonly used to store video and audio, but can also be used to store other data such as subtitles and still images. M4A stands for MPEG 4 Audio and is a filename extension used to represent audio files. | Vorbis is a free and open-source software project headed by the Xiph.Org Foundation. The project produces an audio coding format and software reference encoder/decoder (codec) for lossy audio compression. Vorbis is most commonly used in conjunction with the Ogg container format and it is therefore often referred to as Ogg Vorbis. |
| Technical details | Audio-only MPEG-4 files generally have a .m4a extension. This is especially true of non-protected content. M4A is often compressed using AAC encoding (lossy), but can also be in Apple Lossless format. | Vorbis had been shown to perform significantly better than many other lossy audio formats in the past in that it produced smaller files at equivalent or higher quality while retaining computational complexity comparable to other MDCT formats such as AAC or Windows Media Audio. |
| Associated programs | Windows Media Player, RealPlayer, MPlayer, Media Player Classic, VLC Media Player, K-Multimedia Player | VLC media player, MPlayer, Winamp, foobar2000. |
| Wiki | https://en.wikipedia.org/wiki/MPEG-4_Part_14 | https://en.wikipedia.org/wiki/Vorbis |