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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
This is some refactoring I did at last year's Oslo hackfest as preparation for adding 360 degree support (https://gitlab.freedesktop.org/thaytan/gst-plugins-good/commits/spatial-media-isomp4). I'm not quite ready to merge the 360 atom support yet, but getting the refactoring in would prevent conflicts in rebasing that branch and I think makes qtdemux a little tidier - which can only be good.