dxva2_hevc: don't use frames as reference if they are not marked as such

Similar to how a frame is considered for referencing for the RefPicList array.
This will do the same for RefPicSetStCurrBefore, RefPicSetStCurrAfter and
RefPicSetLtCurr.

Fixes playback of http://www.gbbsoft.pl/!download/!/Film1.mp4
Ref. VLC issue https://code.videolan.org/videolan/vlc/-/issues/26738

Signed-off-by: Steve Lhomme <robux4@ycbcr.xyz>

libavcodec/dxva2_hevc.c

@@ -184,7 +184,7 @@ static void fill_picture_parameters(const AVCodecContext *avctx, AVDXVAContext *
             const HEVCFrame *frame = NULL; \
             while (!frame && j < rpl->nb_refs) \
                 frame = rpl->ref[j++]; \
-            if (frame) \
+            if (frame && frame->flags & (HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF)) \
                 pp->ref_list[i] = get_refpic_index(pp, ff_dxva2_get_surface_index(avctx, ctx, frame->frame)); \
             else \
                 pp->ref_list[i] = 0xff; \