Backport of "uridecodebin3: make caps property work" into 1.18
requested to merge tpm/gst-plugins-base:backport-mr-1034-into-1.18-uridecodebin3-make-caps-property-work into 1.18
Backport of !1034 (merged) "uridecodebin3: make caps property work".
Commits:
- c7f1fd83 uridecodebin3: make caps property work