How to open a FULL HD video file with extension .mpeg2 in Final Cut Pro X ?

I would like to know How to Import or Open a Video FULL HD in Final Cut Pro X or Final Cut Pro 7.0.3 . . . I only can Open a HD video but not a FULL HD.

May need some codec ??? May some setup . . .

Whithout info , I have to RECODE a file to downgrade resolution . . . using a software like a Hand Brake to CONVERT to another extension like .mov, m4p, mkv, etc . . .

Same problem occur with a " iMovie " software comming with OS Lion . . .

So, why ?

Double work . . . double file occupied in hard drive . . . lost time !

Someone can Help Me ?

Thanks,

jbgodoy