Instructions
Insert the flash drive into one of the front USB ports on the PS3.
Use the directional pad on the PS3 controller to scroll to the "Video" tab on the PS3 main menu. Highlight "Display All" and press the "Triangle" button to display all the videos on the flash drive.
Select the video you want to play and press the "X" button. You'll also have the option of copying the video from the flash drive to the PS3 hard drive. Select the video you want to copy, press the "Triangle" button and select "Copy."