.MOV - Apple QuickTime movie format
.MP4 - MPEG-4 base media file format
.M4A - iTunes MPEG-4 audio format
.M4R - iPhone ring-tone
.3GP - 3GPP file format
.3G2 - 3GPP 'project 2' file format

These are all closely related formats - with various individual variations, restrictions, or extensions. Only audio tracks will be read by this program - video is ignored (if there's more than one audio track then each will appears as its own waveform).



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