@@ -188,7 +188,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *cur)

         decimate->ref = cur;

         decimate->drop_count = FFMIN(-1, decimate->drop_count-1);

-        if (ret = ff_filter_frame(outlink, av_frame_clone(cur)) < 0)

+        if ((ret = ff_filter_frame(outlink, av_frame_clone(cur))) < 0)

             return ret;

     }