Backport of "splitmuxsink: always use factory property when set" into 1.18
Backport of !1024 (merged) "splitmuxsink: always use factory property when set".
Commits:
- a6d6e99f splitmuxsink: always use factory property when set
Backport of !1024 (merged) "splitmuxsink: always use factory property when set".
Commits: