Backport of "videoaggregator: document and fix locking in convert pad" into 1.18
Backport of !897 (merged) "videoaggregator: document and fix locking in convert pad".
Commits:
- eb216e38 videoaggregator: document and fix locking in convert pad
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Backport of !897 (merged) "videoaggregator: document and fix locking in convert pad".
Commits: