it may just be that nat geo music sd has become a wide screen aspect ratio channel just like ftv india, itv granada, baby tv. all these r sd channels which telecast in 16:9 aspect ratio, that does not make them hd.most sd in europe are transmitted in wide acreen aspect ration that does not make them hd
anyeways bhat sir u have equipments just test by acnning dish tv tp if its a hd channel. if yes it will b in mpeg 4