Click to Play
Audio A/B Cable
Plug the S-Video cable from the back of the PowerBook G4 into the S-Video input of your TV. Then from the Apple menu, choose System Prefernces, Choose Displays, then click on Detect Displays.
After the computer detects the external display, the TV, turn Mirroring on and what you see on your computer will be displayed on the TV.
Then plug the Audio Splitter into the Audio out port on your computer. Connect the white and red cables to the TV audio inputs.
QuickTime - Play a video and choose View, Full Screen and the video will play full screen on your TV.
Other video players you can try are FireAnt and Democracy.
Newer Macs have Front Row with an IR remote you can use to control viewing videos on your Mac. Here's a blog post that explains how to intall Front Row on older Macs.