Download a movie from any website you can or use the built-in video store. PlayBook supports a great variety of standard formats - see "Supported Media Types on BlackBerry Tablets Reference Guide" ... sorry - I am not allowed to post URLs so here it is this way:
(no spaces in the URL, don't know why the preview is adding it, or Google the name)
If you already have the movie on your computer, you can simply copy it to your PlayBook in one of two ways:
a) Allow file sharing over WiFi (Settings -> Storage & Sharing, then allow "File Sharing" *and* Wi-Fi Sharing). Your PlayBook will appear on the network with its shared drive so you can copy the files from your computer to it wirelessly.
b) Just allow file sharing (like above, not WiFi) and connect your PlayBook to your computer using USB cable. If you are doing this for the first time you will install some software, then you will notice a new drive, which is the PlayBook.
to be honest, i tried lots of DVD ripping software, PavTube DVD ripper is more
satisfactory, pretty good video quality and fast conversion speed, optimized playbook preset makes the operation steps much easier, i love it