From 6b168ffb44176c131e802eb8064401bdc2f14299 Mon Sep 17 00:00:00 2001
From: Stas Sergeev <stsp@users.sourceforge.net>
Date: Tue, 11 Oct 2011 20:56:51 +0400
Subject: [PATCH] flvdemux: be careful with negative cts

Fixes #661477.
---
 gst/flv/gstflvdemux.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gst/flv/gstflvdemux.c b/gst/flv/gstflvdemux.c
index 7432520e27..8aa352e53b 100644
--- a/gst/flv/gstflvdemux.c
+++ b/gst/flv/gstflvdemux.c
@@ -1195,7 +1195,9 @@ gst_flv_demux_parse_tag_video (GstFlvDemux * demux, GstBuffer * buffer)
 
     GST_LOG_OBJECT (demux, "got cts %d", cts);
 
-    pts = pts + cts;
+    /* avoid negative overflow */
+    if (cts >= 0 || pts >= -cts)
+      pts += cts;
   }
 
   GST_LOG_OBJECT (demux, "video tag with codec tag %u, keyframe (%d) "