libavcodec/vc1dec.c:734: error: Uninitialized Value
  The value read from ty was never initialized.

libavcodec/vc1dec.c:734:9: 
732.         }
733.         s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;
734.         s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1] = ty;
             ^
735.         for (k = 0; k < 4; k++) v->mv_f[1][s->block_index[k] + v->blocks_off] = f;
736.     }
