FS-5959 add rtp_mirror_fmtp var

src/switch_core_media.c

@@ -6293,9 +6293,10 @@ SWITCH_DECLARE(void) switch_core_media_gen_local_sdp(switch_core_session_t *sess
 
 					if (ov_fmtp) {
 						pass_fmtp = ov_fmtp;
-					}// else { // seems to break eyebeam at least...
-						//pass_fmtp = switch_channel_get_variable(session->channel, "rtp_video_fmtp");
-					//}
+					} else if (switch_true(switch_channel_get_variable_dup(session->channel, "rtp_mirror_fmtp", SWITCH_FALSE, -1))) { 
+						// seems to break eyebeam at least...
+						pass_fmtp = switch_channel_get_variable(session->channel, "rtp_video_fmtp");
+					}
 				}
 
 				if (pass_fmtp) {