I am making a video for a friend.. He gave me clips that are all mpg from his camera... they play fine but in quicktime and imovie there is no audio. When i play them in vlc the audio plays fine.. What could be the problem? Additionally, how can i find out the resolution and everything of the video.. When you create a new project in imovie.. it asks whether you want it widescreen dv or widerscreen 1080i, 720p.. how could i find out the format the clips were shot in.. i believe they are hd but not sure which format.