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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]
EZ CD Audio Converter, FFmpeg with Mainconcept plugin (encoder only), Sonnox, Apple (decoder only), QuickTime (Mac version & decoder only). Exhale (encoder only), FFmpeg (decoding only with Fraunhofer FDK AAC library enabled for manually command, native decoding only), Android (decoder only) - Yes No No No No Vorbis Xiph.Org Foundation: 2000-05-11
LAME (encoding only) Advanced Audio Coding (AAC) (MPEG-2 Part 7) FAAC (encoder) and FAAD (decoder) FFmpeg; iTunes; 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
In May 2006, Nero AG released an AAC encoding tool free of charge, Nero Digital Audio (the AAC codec portion has become Nero AAC Codec), [75] which is capable of encoding LC-AAC, HE-AAC and HE-AAC v2 streams. The tool is a command-line interface tool only.
Winamp.com Audio player/ripper that allows you to rip CDs into HE-AAC and convert other audio files into HE-AAC (with a free add-on). EZ CD Audio Converter CD Ripper, Audio Converter, and CD Burner that allows you to rip to AAC-LC and HE-AAC, convert to AAC-LC and HE-AAC and burn AAC-LC and HE-AAC to an Audio CD.
An audio conversion app (also known as an audio converter) transcodes one audio file format into another; for example, from FLAC into MP3. It may allow selection of encoding parameters for each of the output file to optimize its quality and size.
The most widely used audio coding formats are MP3 and Advanced Audio Coding (AAC), both of which are lossy formats based on modified discrete cosine transform (MDCT) and perceptual coding algorithms. Lossless audio coding formats such as FLAC and Apple Lossless are sometimes available, though at the cost of larger files.
Encoding and transcoding video and audio from one format to another. Command-line utilities afconvert (to convert audio formats), avconvert (to convert video formats) and qtmodernizer (to automatically convert older formats to H.264/AAC) are provided with macOS for power users.