From 8d2e0e2c7058a3eaf7f45d740be6e93972bbfd68 Mon Sep 17 00:00:00 2001
From: Anuj Mittal <am.devel@gmail.com>
Date: Tue, 9 Oct 2012 18:55:14 +0530
Subject: [PATCH] Check for resync marker based on vop coding type-
 vop_fcode_forward and vop_fcode_backward L

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/ituh263dec.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavcodec/ituh263dec.c b/libavcodec/ituh263dec.c
index a7d8d202cc..6d432337bd 100644
--- a/libavcodec/ituh263dec.c
+++ b/libavcodec/ituh263dec.c
@@ -214,10 +214,11 @@ const uint8_t *ff_h263_find_resync_marker(MpegEncContext *s, const uint8_t *av_r
     end-=2;
     p++;
     if(s->resync_marker){
+        int prefix_len = ff_mpeg4_get_video_packet_prefix_length(s);
         for(;p<end; p+=2){
             if(!*p){
-                if     (!p[-1] && p[1]) return p - 1;
-                else if(!p[ 1] && p[2]) return p;
+                if      (!p[-1] && ((p[1] >> (23-prefix_len)) == 1)) return p - 1;
+                else if (!p[ 1] && ((p[2] >> (23-prefix_len)) == 1)) return p;
             }
         }
     }