dxva2_vc1: pass the overlap flag to the decoder

Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/dxva2_vc1.c

@@ -101,7 +101,8 @@ static void fill_picture_parameters(AVCodecContext *avctx,
                                   (v->rangered       << 3) |
                                   (s->max_b_frames       );
     pp->bPicExtrapolation       = (!v->interlace || v->fcm == PROGRESSIVE) ? 1 : 2;
-    pp->bPicDeblocked           = ((v->profile != PROFILE_ADVANCED && v->rangeredfrm) << 5) |
+    pp->bPicDeblocked           = ((!pp->bPicBackwardPrediction && v->overlap)        << 6) |
+                                  ((v->profile != PROFILE_ADVANCED && v->rangeredfrm) << 5) |
                                   (s->loop_filter                                     << 1);
     pp->bPicDeblockConfined     = (v->postprocflag             << 7) |
                                   (v->broadcast                << 6) |