How can I merge two clips with different orientations using an AVMutableCompasition and AVAssetTracks? It works when the orientations are correct, but if I use something like a Square cropped video the export just fails with an "Unknown Error".
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Though it is in objc, it may help you: http://stackoverflow.com/questions/6575128/how-to-combine-video-clips-with-different-orientation-using-avfoundation – Papershine Feb 28 '17 at 09:49