From 131fac1c12edacec254fcaed70dbf50f36603b3c Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Thu, 31 Jan 2013 23:20:15 +0100
Subject: [PATCH] vc1dec: fix block_off

Fixes corruption of motion_val

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/vc1dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index e056ffb525..01fe1ec848 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -5672,7 +5672,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
                     continue;
                 }
                 v->second_field = 1;
-                v->blocks_off   = s->mb_width  * s->mb_height << 1;
+                v->blocks_off   = s->b8_stride * (s->mb_height&~1);
                 v->mb_off       = s->mb_stride * s->mb_height >> 1;
             } else {
                 v->second_field = 0;