AAC
From Just Solve the File Format Problem
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| − | '''AAC''' ('''Advanced Audio Coding''') is a compressed audio format defined in [[MPEG-2]] Part 7 (ISO/IEC 13818-7), and in an updated form in [[MPEG-4]] Part 3 (ISO/IEC 14496-3). It was designed to be the successor to [[MP3]]. | + | '''AAC''' ('''Advanced Audio Coding''') is a compressed audio format defined in [[MPEG-2]] Part 7 (ISO/IEC 13818-7), and in an updated form in [[MPEG-4]] Part 3 (ISO/IEC 14496-3). It was designed to be the successor to [[MP3]]. iTunes distributes (or distributed) files in this format, apparently including various metadata (like the name, and sometimes email of the account which downloaded it, along with the time it was downloaded). |
An AAC file may contain only the raw AAC format, or it may use a multimedia container format such [[MP4]] or [[QuickTime]]. AAC is often used for the audio component of a video file. | An AAC file may contain only the raw AAC format, or it may use a multimedia container format such [[MP4]] or [[QuickTime]]. AAC is often used for the audio component of a video file. | ||
== Identifiers == | == Identifiers == | ||
| − | Raw AAC files typically use the file extension '''.aac'''. In formats based on [[ISO Base Media File Format]], the brand "<code>M4A </code>" is used. | + | Raw AAC files typically use the file extension '''.aac'''. In formats based on [[ISO Base Media File Format]], the brand "<code>M4A</code>" is used. |
{| class="wikitable" | {| class="wikitable" | ||
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* [http://www.vialicensing.com/licensing/aac-overview.aspx AAC licensing] | * [http://www.vialicensing.com/licensing/aac-overview.aspx AAC licensing] | ||
* [http://inkdroid.org/journal/2014/05/23/realaudio-aac-and-archivy/ RealAudio, AAC and Archivy] | * [http://inkdroid.org/journal/2014/05/23/realaudio-aac-and-archivy/ RealAudio, AAC and Archivy] | ||
| + | * [https://web.archive.org/web/20190209085502/https://forensicswiki.org/wiki/AAC ForensicsWiki entry] | ||
[[Category:MPEG]] | [[Category:MPEG]] | ||
[[Category:MPEG-4]] | [[Category:MPEG-4]] | ||
[[Category:Box file format]] | [[Category:Box file format]] | ||
Revision as of 23:12, 25 October 2020
AAC (Advanced Audio Coding) is a compressed audio format defined in MPEG-2 Part 7 (ISO/IEC 13818-7), and in an updated form in MPEG-4 Part 3 (ISO/IEC 14496-3). It was designed to be the successor to MP3. iTunes distributes (or distributed) files in this format, apparently including various metadata (like the name, and sometimes email of the account which downloaded it, along with the time it was downloaded).
An AAC file may contain only the raw AAC format, or it may use a multimedia container format such MP4 or QuickTime. AAC is often used for the audio component of a video file.
Contents |
Identifiers
Raw AAC files typically use the file extension .aac. In formats based on ISO Base Media File Format, the brand "M4A" is used.
| Format | LoCFDD |
|---|---|
| AAC (MPEG-2) | fdd000036 |
| AAC (MPEG-2), ADIF | fdd000112 |
| AAC (MPEG-4) | fdd000114 |
| AAC (MPEG-4) Low Complexity Object | fdd000233 |
| MPEG-4 File Format, V.2, with AAC | fdd000234 |
| QuickTime Audio, AAC Codec | fdd000110 |
Specifications
- ISO/IEC 13818-7:2006 (MPEG-2 Part 7) (not free to download)
- ISO/IEC 14496-3:2009 (MPEG-4 Part 3) (not free to download)
Software
Sample files
- http://download.wavetlan.com/SVV/Media/HTTP/http-aac.htm
- http://samples.libav.org/A-codecs/AAC/
- http://samples.libav.org/A-codecs/suite/MP4A
