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You can use AtomicParsley to parse the metadata of a MP4-file. For example AtomicParsley /path/to.mp4 -T 1 will print the whole atom tree.


There's no way to do this losslessly, other than setting a meta-data flag and depending on players to rotate the video. (This is what cell-phone cameras do). With avconv / ffmpeg, what you're doing is using your decoded -> transposed video as a source to encode with x264. See https://trac.ffmpeg.org/wiki/Encode/H.264 for how to do this. IDK where you ...

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