tags are a special issue in mp4 because there is an official tagging standard for mp4, but the power of itunes (which uses a private tagging way) lead to that people use only the itunestagging
and as always private stuff leads to a mess...
i would say there are two good mp4 libs available: the one from mpeg4ip and the one from gpac
mpeg4ip tags in the itunesway, gpac i think in the official mpeg way (but i have to admit i never really tested it so i dunno much about it)
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