MP4 vs M4A
M4A file type is primarily associated with 'MPEG-4 Audio Layer'. Files in .M4A format are actually the audio layer of (non-video) MPEG 4 movies.
MP4 is a multimedia container format standard specified as a part of MPEG-4. The MPEG-4 video format uses separate compression for audio and video tracks. Video is compressed with MPEG-4 video encoding.
1: M4A stands for MPEG 4 Audio and is a filename extension used to represent audio files.
2: MP4 and .M4A, for naming audio-only MP4 files has been a source of confusion among users and multimedia playback software.
3: Apple Inc. started using and popularizing the .m4a filename extension, which is used for MP4 containers with audio data in the lossy AAC or its own lossless ALAC formats.
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