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2. Apple Lossless Audio Codec - Wikipedia

   en.wikipedia.org/wiki/Apple_Lossless_Audio_Codec

   ALAC supports up to 8 channels of audio at 16, 20, 24 and 32 bit depth with a maximum sample rate of 384 kHz. ALAC data is frequently stored within an MP4 container with the filename extension.m4a. This extension is also used by Apple for lossy AAC audio data in an MP4 container (same container, different audio encoding).

3. Audio file format - Wikipedia

   en.wikipedia.org/wiki/Audio_file_format

   .m4a: An audio-only MPEG-4 file, used by Apple for unprotected music downloaded from their iTunes Music Store. Audio within the m4a file is typically encoded with AAC, although lossless ALAC may also be used. .m4b: An Audiobook / podcast extension with AAC or ALAC encoded audio in an MPEG-4 container. Both M4A and M4B formats can contain ...

4. MP4 file format - Wikipedia

   en.wikipedia.org/wiki/MP4_file_format

   MPEG-4 files with audio and video generally use the standard .mp4 extension. Audio-only MPEG-4 files generally have a .m4a extension. This is especially true of unprotected content. MPEG-4 files with audio streams encrypted by FairPlay digital rights management as were sold through the iTunes Store use the .m4p extension.

5. Advanced Audio Coding - Wikipedia

   en.wikipedia.org/wiki/Advanced_Audio_Coding

   All AAC profiles and bitrates are supported as long as it is in the .m4a file extension. The 1.1 update removed MP3 compatibility, but according to Nintendo, users who have installed this may freely downgrade to the old version if they wish. [70] Livescribe Pulse and Echo Smartpens: record and store audio in AAC format. The audio files can be ...

6. MPEG-4 - Wikipedia

   en.wikipedia.org/wiki/MPEG-4

   MPEG-4 is a group of international standards for the compression of digital audio and visual data, multimedia systems, and file storage formats. It was originally introduced in late 1998 as a group of audio and video coding formats and related technology agreed upon by the ISO/IEC Moving Picture Experts Group (MPEG) (ISO/IEC JTC 1/SC29/WG11) under the formal standard ISO/IEC 14496 – Coding ...

7. Comparison of audio coding formats - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_audio_coding...

   For example, MP3 and AAC dominate the personal audio market in terms of market share, though many other formats are comparably well suited to fill this role from a purely technical standpoint. First public release date is first of either specification publishing or source releasing, or in the case of closed-specification, closed-source codecs ...

8. List of open-source codecs - Wikipedia

   en.wikipedia.org/wiki/List_of_open-source_codecs

   FAAD2 – open-source decoder for Advanced Audio Coding. There is also FAAC, the same project's encoder, but it is proprietary (but still free of charge). libgsm – Lossy compression ; opencore-amr – Lossy compression (AMR and AMR-WB) liba52 – a free ATSC A/52 stream decoder (AC-3) libdca – a free DTS Coherent Acoustics decoder

9. Audacity (audio editor) - Wikipedia

   en.wikipedia.org/wiki/Audacity_(audio_editor)

   Audacity is a free and open-source digital audio editor and recording application software, available for Windows, macOS, Linux, and other Unix-like operating systems. [ 4 ] [ 5 ] As of December 6, 2022, Audacity is the most popular download at FossHub, [ 8 ] with over 114.2 million downloads since March 2015.