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Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression. It was designed to be the successor of the MP3 format and generally achieves higher sound quality than MP3 at the same bit rate. [4] AAC has been standardized by ISO and IEC as part of the MPEG-2 and MPEG-4 specifications.
The data compression software for encoding into ALAC files, Apple Lossless Encoder, was introduced into the Mac OS X Core Audio framework on April 28, 2004, together with the QuickTime 6.5.1 update, thus making it available in iTunes since version 4.5 and above, and its replacement, the Music application. [8]
Encoder Player AAC: ISO/IEC MPEG Audio Committee: 1997 ISO/IEC 14496-3 Non-free [1] Nero Digital Audio, Apple CoreAudio (via QuickTime, iTunes or afconvert [2]) FAAC (encoding only), FAAD2 (decoding only), FFmpeg, Audiocogs [3] (decoding only), Fraunhofer FDK AAC: Digital TV service, Digital Radio, Internet streaming Yes AAC-LD/AAC-ELD MPEG-4 ...
Nero AAC Codec; VisualOn AAC Encoder (a.k.a. libvo_aacenc) Fraunhofer FDK AAC; libaacplus; MPEG-4 Audio. Advanced Audio Coding (AAC, MPEG-4 Part 3 subpart 4), HE-AAC and AAC-LD. FAAC, FAAD2; FFmpeg; iTunes; Nero AAC Codec; MPEG-4 AAC reference software (ISO/IEC 14496-5:2001) Harmonic and Individual Lines and Noise (HILN, MPEG-4 Parametric Audio ...
HE-AAC and HE-AAC v2 audio coding for DVB applications is standardized by TS 101 154. [ 36 ] [ 37 ] AacPlus v2 by Coding Technologies [ 38 ] is also standardized by the ETSI as TS 102 005 for Satellite services to Handheld devices (DVB-SH) below 3 GHz.
An audio coding format [1] (or sometimes audio compression format) is a content representation format for storage or transmission of digital audio (such as in digital television, digital radio and in audio and video files). Examples of audio coding formats include MP3, AAC, Vorbis, FLAC, and Opus.
In QuickTime Pro's MPEG-4 Export dialog, an option called "Passthrough" allows a clean export to MP4 without affecting the audio or video streams. QuickTime 7 now supports multi-channel AAC-LC and HE-AAC audio (used, for example, in the high-definition trailers on Apple's site), [41] for both .MOV and .MP4 containers.
Core Audio is a low-level API for dealing with sound in Apple's macOS and iOS operating systems.It includes an implementation of the cross-platform OpenAL. [1]Apple's Core Audio documentation states that "in creating this new architecture on Mac OS X, Apple's objective in the audio space has been twofold.