@@ -1255,8 +1255,9 @@ static void pictq_next_picture(VideoState *is) {

     SDL_UnlockMutex(is->pictq_mutex);

 }

-static void pictq_prev_picture(VideoState *is) {

+static int pictq_prev_picture(VideoState *is) {

     VideoPicture *prevvp;

+    int ret = 0;

     /* update queue size and signal for the previous picture */

     prevvp = &is->pictq[(is->pictq_rindex + VIDEO_PICTURE_QUEUE_SIZE - 1) % VIDEO_PICTURE_QUEUE_SIZE];

     if (prevvp->allocated && prevvp->serial == is->videoq.serial) {

@@ -1265,10 +1266,12 @@ static void pictq_prev_picture(VideoState *is) {

             if (--is->pictq_rindex == -1)

                 is->pictq_rindex = VIDEO_PICTURE_QUEUE_SIZE - 1;

             is->pictq_size++;

+            ret = 1;

         }

         SDL_CondSignal(is->pictq_cond);

         SDL_UnlockMutex(is->pictq_mutex);

     }

+    return ret;

 }

 static void update_video_pts(VideoState *is, double pts, int64_t pos, int serial) {