AAC

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File Format
Name AAC
Ontology
Extension(s) .aac, .mp4, .m4a
LoCFDD fdd000114, others
Released 1997

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

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

Specifications

Software

Sample files

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