Backport of "avwait: Allow setting start timecode after end timecode; protect propeties with mutex" into 1.16
Backport of !352 (merged) "avwait: Allow setting start timecode after end timecode; protect propeties with mutex".
Commits:
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Backport of !352 (merged) "avwait: Allow setting start timecode after end timecode; protect propeties with mutex".
Commits: