If you are trying to stream it, it may need to be "web optimized" using a tool like HandBrake.
If you are having trouble with this specific file, here are common ways to handle it: g4_01133.mp4
Double-click the file to open it with QuickTime Player . 2. Troubleshooting Playback If the file won't play or has no video, it might be due to: If you are trying to stream it, it