AAC
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|released=1997 | |released=1997 | ||
|extensions={{ext|aac}}, {{ext|mp4}}, {{ext|m4a}} | |extensions={{ext|aac}}, {{ext|mp4}}, {{ext|m4a}} | ||
| + | |pronom={{PRONOM|fmt/1812}} | ||
|locfdd={{LoCFDD|fdd000114}}, others | |locfdd={{LoCFDD|fdd000114}}, others | ||
}} | }} | ||
| − | '''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 == | ||
| − | + | Audio Data Transport Stream '''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" | ||
| Line 38: | Line 39: | ||
* [[Konvertor]] | * [[Konvertor]] | ||
* [[VLC]] | * [[VLC]] | ||
| − | * [http:// | + | * [http://faac.sourceforge.net/ FAAD2] |
* [http://www.iis.fraunhofer.de/en/ff/amm/impl/fdkaaccodec.html Fraunhofer FDK AAC] | * [http://www.iis.fraunhofer.de/en/ff/amm/impl/fdkaaccodec.html Fraunhofer FDK AAC] | ||
| + | * [https://developer.apple.com/library/archive/technotes/tn2271/_index.html#//apple_ref/doc/uid/DTS40012667-CH1-TNTAG3-COMMAND_LINE_SETTINGS Apple afconvert] Apple only officially supports Stereo channel encoding | ||
== Sample files == | == Sample files == | ||
* http://download.wavetlan.com/SVV/Media/HTTP/http-aac.htm | * http://download.wavetlan.com/SVV/Media/HTTP/http-aac.htm | ||
| − | * | + | * https://samples.mplayerhq.hu/A-codecs/AAC/ |
| − | * http://samples. | + | * http://samples.mplayerhq.hu/A-codecs/suite/MP4A |
| + | * {{DexvertSamples|audio/aac}} | ||
== Links == | == Links == | ||
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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]] | ||
Latest revision as of 04:09, 28 December 2023
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 |
[edit] Identifiers
Audio Data Transport Stream 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 |
[edit] 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)
[edit] Software
- FFmpeg
- Konvertor
- VLC
- FAAD2
- Fraunhofer FDK AAC
- Apple afconvert Apple only officially supports Stereo channel encoding
[edit] Sample files
- http://download.wavetlan.com/SVV/Media/HTTP/http-aac.htm
- https://samples.mplayerhq.hu/A-codecs/AAC/
- http://samples.mplayerhq.hu/A-codecs/suite/MP4A
- dexvert samples — audio/aac
