Correctly detect when use hpel or qpel mode

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@5601 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/vc1.c

@@ -1330,8 +1330,13 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
         }
         if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)
             v->s.quarter_sample = 0;
+        else if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {
+            if(v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)
+                v->s.quarter_sample = 0;
             else
                 v->s.quarter_sample = 1;
+        } else
+            v->s.quarter_sample = 1;
 
         if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&
                  v->mv_mode2 == MV_PMODE_MIXED_MV)