isomp4: set mdhd.duration with adjusted timescale, reverts PR #317 #332
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the approach taken in PR #317 doesn't allow to adjust duration to mdhd timescale, so I reverted the changes and modified only moov atom
Please advise what code I can reuse to avoid/reduce the risk of multiplication overflow during the timescale conversion.
I found some logic in core\units.rs but didn't find it easy to reuse.