rtpsubstream: Don't try to modify caps from buffer
rtpsubstream: Don't try to modify caps from buffer

shadeslayer/farstream,kakaroto/farstream,pexip/farstream,kakaroto/farstream,tieto/farstream,ahmedammar/skype_farsight2,ahmedammar/skype_farsight2,tieto/farstream,tieto/farstream,kakaroto/farstream,ahmedammar/skype_farsight2,pexip/farstream,ahmedammar/skype_farsight2,pexip/farstream,kakaroto/farstream,tieto/farstream,shadeslayer/farstream,shadeslayer/farstream,shadeslayer/farstream,tieto/farstream,pexip/farstream