Things You'll Need
Instructions
Examine your computer to see what connection options are available for you to use. The PS3 has HDMI and RCA output connections, so if your computer features either of these, you can use them to connect your PS3 to your computer.
Connect either the HDMI cable or RCA cables from the output ports on the PS3 to the corresponding input connection on the computer.
Download and install a video recording program such as iMovie, Debut Video Recording or Camtasia Studio (see Resources).
Power on the PS3 and insert a game disc.
Open the software you installed and begin recording per the manufacturer's instructions.
Edit all the clips you record into a "montage" using the editing interface of the recording program you use. This will, of course, vary depending on what type of recording and editing software you use, so consult the program's documentation for help with the editing interface.