Computer DVD Player Issue
If you are trying to play a DVD via a disc drive attached to your computer, you may face some issues. On a MacBook, the computer may automatically open the Viewer app when you insert the DVD; this app can be inefficient, especially if your computer is hooked up to a Clevertouch Board via cable. Close Viewer and open VLC Media Player (its icon is an orange and white traffic cone). Once you have opened this app, go to File, then Open From Disc, which will let you select the DVD in question and play it efficiently.