From: Michael Niedermayer <michae...@gmx.at>

Signed-off-by: Michael Niedermayer <michae...@gmx.at>
Signed-off-by: Justin Ruggles <justin.rugg...@gmail.com>
---
 libavcodec/parser.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/libavcodec/parser.c b/libavcodec/parser.c
index 7ace766..5e559f7 100644
--- a/libavcodec/parser.c
+++ b/libavcodec/parser.c
@@ -254,7 +254,9 @@ int ff_combine_frame(ParseContext *pc, int next, const 
uint8_t **buf, int *buf_s
         if(!new_buffer)
             return AVERROR(ENOMEM);
         pc->buffer = new_buffer;
-        memcpy(&pc->buffer[pc->index], *buf, next + 
FF_INPUT_BUFFER_PADDING_SIZE );
+        if (FF_INPUT_BUFFER_PADDING_SIZE > -next)
+            memcpy(&pc->buffer[pc->index], *buf,
+                   next + FF_INPUT_BUFFER_PADDING_SIZE);
         pc->index = 0;
         *buf= pc->buffer;
     }
-- 
1.7.1

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