We recommend you open all types of videos using the Xuggle video engine, which runs in a 64-bit Java VM on Mac OS X 10.5+.

If you prefer to use the QuickTime video engine you can still do so. But you must set the Java Preferences to 32-bit. Here's how:

1. Open Java Preferences in the Applications/Utilities folder.
2. In the General tab, drag 32 bit Java to the top position (ie, above 64 bit Java) in both the Applets and Applications panes.

Note: you cannot use both Xuggle and QuickTime simultaneously on OS X. If you are using Xuggle, there is no need to set the Java preferences as described above.

Post edited November 28, 2011 at 11:48 AM EST.