1 files changed, 2 insertions, 0 deletions
diff --git a/rtp.c b/rtp.c
index 99a20fc0e..48d6f85cc 100755
--- a/rtp.c
+++ b/rtp.c
@@ -460,6 +460,8 @@ struct ast_frame *ast_rtp_read(struct ast_rtp *rtp)
 		}
 	} else {
 		/* Video -- samples is # of samples vs. 90000 */
+		if (!rtp->lastividtimestamp)
+			rtp->lastividtimestamp = timestamp;
 		rtp->f.samples = timestamp - rtp->lastividtimestamp;
 		rtp->lastividtimestamp = timestamp;
 		if (mark)