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Support ReplayGain in mp4 #1916
Now QL and the QL ReplayGain Scanner will read and write ReplayGain tags from mp4/m4a files in the format used by the foobar2000 and deadbeef media players. There are no standard ReplayGain tags for mp4, it is simply the flac/vorbiscomment named tags and data format as mp4 freeform tags.
This is not support for Apple's "SoundCheck" iTunNorm tag.