I have noticed that some videos that i've downloaded from the internet play a lot better on vlc than quicktime. Is this a codec issue? I am a novice in this area and can't seem to figure out why quicktime can't compete with 3rd party software. When i watch hd clips on quicktime i get a lousy frame rate.. that same video looks awesome on vlc. I just hate the lack of options in vlc compared to quicktime though.