1388 Apple Lossless Audio Codec Audio Apple Lossless, also known as Apple Lossless Audio Codec (ALAC), or Apple Lossless Encoder (ALE), is an audio codec developed by Apple Inc. for lossless data compression of digital music. Apple Lossless data is stored within an MP4 container with the filename extension .m4a. 1 Digital Preservation Department / The National Archives 12 Nov 2013 v.123- Priority added over fmt/2094 M4A Audio. Submitted by Preservica. 09 Jun 2026 fmt/596 PUID m4a File extension mp4 File extension 936 Apple Lossless Audio Codec BOF: (offset 4): ftypM4A VAR: alac{0-72}alac 1 Absolute from BOF 4 667479704D344120 1 Variable 616C6163{0-72}616C6163 Has priority over 924 MPEG-4 Media File Has priority over 3971 M4A Audio Has priority over 3907 Daisy Talking Book Navigation Control File