Backport of "qtdemux/mux: Drop av1C version 0 parsing and implement version 1 parsing/writing" into 1.22
Backport of !3882 (merged) "qtdemux/mux: Drop av1C version 0 parsing and implement version 1 parsing/writing".
Commits:
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Backport of !3882 (merged) "qtdemux/mux: Drop av1C version 0 parsing and implement version 1 parsing/writing".
Commits: