Backport of "rtpbasepayload: always store input buffer meta before negotiation" into 1.20
requested to merge tpm/gstreamer:backport-mr-2304-into-1.20-rtpbasepayload-fix-first-buffers-extension into 1.20
Backport of !2304 (merged) "rtpbasepayload: always store input buffer meta before negotiation".
Commits:
- a03db32b rtpbasepayload: always store input buffer meta before negotiation