If you have Quicktime 7, you can tweak some of the finer points while the video is playing. Some features are only supported if you have a video card that supports Core Image, but most modern macs have this. Even if your Mac doesn't, you can still play around with some of the features. Open 'Quicktime Player' Finder -> Go -> Applications Next, open a movie (you probably have some in your Movies folder). Now, hold down 'COMMAND + K', or alternately, go to 'Window -> Show A/V Controls' Now, you can play around with some of the controls and change the video playback speed, and tweak with the color options if you have a video card that is Core Image capable.