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| Name | MP4 | AAC |
| Full name | MP4 - MPEG-4 Part 14 | AAC - Advanced Audio Coding |
| File extension | .mp4, .m4a, .m4p, .m4b, .m4r, .m4v | .aac |
| MIME type | video/mp4 | audio/aac |
| Developed by | International Organization for Standardization | Bell Labs, Fraunhofer Institute etc. |
| Type of format | Media container | Audio compression format |
| Description | MPEG-4 Part 14 or MP4 is a digital multimedia format most commonly used to store video and audio and store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet. | Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression. Designed to be the successor of the MP3 format, AAC generally achieves better sound quality than MP3 at similar bit rates. ISO and IEC have standardized AAC as part of the MPEG-2 and MPEG-4 specifications. |
| Technical details | Most kinds of data can be embedded in MPEG-4 Part 14 files through private streams. A separate hint track is used to include streaming information in the file. | AAC supports the inclusion of 48 full-bandwidth audio channels in one stream plus 16 low-frequency effects channels, up to 16 'coupling' or dialog channels, and up to 16 data streams. The quality for stereo is satisfactory to modest requirements at 96 kbit/s in joint stereo mode; however, hi-fi transparency demands data rates of at least 128 kbit/s. |
| File conversion | MP4 conversion | AAC conversion |
| Associated programs | Windows Media Player, RealPlayer, MPlayer, Media Player Classic, VLC Media Player, K-Multimedia Player | foobar2000, AIMP, DirectShow, QuickTime, VLC media player. |
| Wiki | https://en.wikipedia.org/wiki/MPEG-4_Part_14 | https://en.wikipedia.org/wiki/Advanced_Audio_Coding |
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