isomp4: set mdhd.duration with adjusted timescale, reverts PR #317#332

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sscobici wants to merge 1 commit intopdeljanov:dev-0.6from sscobici:fix-mdhd-duration

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Commits on Dec 27, 2024

isomp4: set mdhd.duration with adjusted timescale, revert PR pdeljanov#317
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