Backport of "qtdemux: Do not set channel-mask to zero" into 1.22
Backport of !6225 (merged) "qtdemux: Do not set channel-mask to zero".
Commits:
- e2167867 qtdemux: Do not set channel-mask to zero
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Backport of !6225 (merged) "qtdemux: Do not set channel-mask to zero".
Commits: