i have install final cut express 4 on my macbook air. everything works perfect. i import hi definition video which i shot using iphone4 and canon ixus100 and when i export it to quicktime, the result is not HD format. The setting and export setting everyhing is correct. i always choose 1280 x780 or 720p format for HD. whats went wrong? i try in imovie, the export is ok. my enlighten me