bmxtranswrap: fix num args required for --seg arg
bmxtranswrap: fix num args required for --seg arg

kierank/bmxlib-bmx,Limecraft/ebu-bmx,ebu/ebu-bmx,kierank/bmxlib-bmx,ebu/ebu-bmx,Limecraft/ebu-bmx,stuarthicks/bmx,xunchangguo/BMX,ebu/ebu-bmx,stuarthicks/bmx,xunchangguo/BMX,stuarthicks/bmx,kierank/bmxlib-bmx,xunchangguo/BMX,Limecraft/ebu-bmx