libavcodec/vc1dec.c:733: error: Uninitialized Value
  The value read from tx was never initialized.

libavcodec/vc1dec.c:733:9: 
731.             break;
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;
