libavcodec/vc1dec.c:741: error: Uninitialized Value
  The value read from tx was never initialized.

libavcodec/vc1dec.c:741:9: 
739.             break;
740.         }
741.         s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;
             ^
742.         s->current_picture.f.motion_val[1][s->block_index[0] + v->blocks_off][1] = ty;
743.         for (k = 0; k < 4; k++)
