libavcodec/vc1dec.c:607: error: Uninitialized Value
  The value read from tx was never initialized.

libavcodec/vc1dec.c:607:9: 
605.             break;
606.         }
607.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;
             ^
608.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = ty;
609.         for (k = 0; k < 4; k++)
