Backport of "videosink: Don't return unknown end-time from get_times()" into 1.20
Backport of !3121 (merged) "videosink: Don't return unknown end-time from get_times()".
Commits:
- c9f12b50 videosink: Don't return unknown end-time from get_times()
Backport of !3121 (merged) "videosink: Don't return unknown end-time from get_times()".
Commits: