diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 75ad80e9a6..bb81d00021 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -15,7 +15,7 @@ extern "C" {
 
 #define FFMPEG_VERSION_INT     0x000408
 #define FFMPEG_VERSION         "0.4.8"
-#define LIBAVCODEC_BUILD       4679
+#define LIBAVCODEC_BUILD       4680
 
 #define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
 #define LIBAVCODEC_VERSION     FFMPEG_VERSION
@@ -1242,6 +1242,14 @@ typedef struct AVCodecContext {
      * - decoding: set by user, will be converted to upper case by lavc during init
      */
     unsigned int stream_codec_tag;
+
+    /**
+     * scene change detection threshold.
+     * 0 is default, larger means fewer detected scene changes
+     * - encoding: set by user.
+     * - decoding: unused
+     */
+    int scenechange_threshold;
 } AVCodecContext;
 
 
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 04e614d71b..b14aa54cd1 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -3416,7 +3416,7 @@ static void encode_picture(MpegEncContext *s, int picture_number)
     }
     emms_c();
 
-    if(s->scene_change_score > 0 && s->pict_type == P_TYPE){
+    if(s->scene_change_score > s->avctx->scenechange_threshold && s->pict_type == P_TYPE){
         s->pict_type= I_TYPE;
         memset(s->mb_type   , MB_TYPE_INTRA, sizeof(uint8_t)*s->mb_stride*s->mb_height);
 //printf("Scene change detected, encoding as I Frame %d %d\n", s->current_picture.mb_var_sum, s->current_picture.mc_mb_var_sum);