Take a Screenshot of DVD Player in OS X
Ever since OS X came out, Apple made sure that it would not be possible to take a screenshot of a DVD. When DVD Player is open, you can’t capture the screen with Grab. Command-Shift-3 and Command-Shift-4 both do not work when DVD Player is open. This makes no sense at all (If you own the DVD, you should have every right to do whatever you want with it! But that’s another story). However, Apple forgot one thing…
1) Put your DVD in your computer and open DVD Player (Applications -> DVD Player) if it does not open automatically. Go to Video -> Maximum Size, or hit Command-3. Fast forward to the frame you want to capture, or select the scene to start at.
2) Open the Terminal (Applications -> Utilities -> Terminal). Type this, or copy / paste it right in the Terminal:
screencapture -i ~/Desktop/dvd.jpg
Your mouse should turn into crosshairs. Now hit the space bar. Your mouse should now be a camera. Click the window the DVD is playing in. A file called “dvd.jpg” will appear on your desktop.