Sets video mark bit on format field correctly

This fixes a regression in the media architecture change
where video frames did not have their video mark set
correctly.  dvossel wrote this. twilson kindly committed
this, mmichelson found the bug.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@313822 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_rtp_asterisk.c

@@ -2311,7 +2311,9 @@ static struct ast_frame *ast_rtp_read(struct ast_rtp_instance *instance, int rtc
 		rtp->f.delivery.tv_sec = 0;
 		rtp->f.delivery.tv_usec = 0;
 		/* Pass the RTP marker bit as bit */
-		ast_format_set_video_mark(&rtp->f.subclass.format);
+		if (mark) {
+			ast_format_set_video_mark(&rtp->f.subclass.format);
+		}
 	} else {
 		/* TEXT -- samples is # of samples vs. 1000 */
 		if (!rtp->lastitexttimestamp)