Backport of "playsink: Set ts-offset to text sink." into 1.16
Backport of !299 (merged) "playsink: Set ts-offset to text sink.".
Commits:
- 3aa1437a playsink: Set ts-offset to text sink.
Backport of !299 (merged) "playsink: Set ts-offset to text sink.".
Commits: