good day
i have problem with playing 720p/60frames video on a 20" iMac 2GHz Core2Duo with 6GB of RAM

it cannot play smoothly in QuickTime, am i dooing something wrong or should i install some support/codec or what ever to play this smoothly ?
can i play 1080p/30fr content also ?
i am trying to play the video recorded by
GoPro Official Store: Wearable Digital Cameras for Sports camera i think it is full hd an i recorder some 720p/60frame video and it doesn't play smoothly
