Backport of "mfvideosrc: Use only the first video stream per device" into 1.18
Backport of !1661 (merged) "mfvideosrc: Use only the first video stream per device".
Commits:
- 20d9283e mfvideosrc: Use only the first video stream per device
Backport of !1661 (merged) "mfvideosrc: Use only the first video stream per device".
Commits: