Backport of "isomp4: Fix (E)AC-3 channel count handling" into 1.22
Backport of !4739 (merged) "isomp4: Fix (E)AC-3 channel count handling".
Commits:
- 93699123 isomp4: Fix (E)AC-3 channel count handling
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Backport of !4739 (merged) "isomp4: Fix (E)AC-3 channel count handling".
Commits: