You don't have to convert it. In your ISO folder on your memory stick, make a folder called VIDEO. Put the iso you just made in that folder. Then hit select while in the xmb to bring up vsh menu. If it doesn't show up, then you have to turn on vsh menu in the recovery menu. I think it is under configuration. If it does show up, go down to ISO VIDEO MOUNT and change from none to whatever the iso name is. Hit select again and go to the game section of the xmb and look at the umd icon. The video should show up. Just hit x to play it. I've never done viewed video isos on my psp before so I don't know if you need a umd in the drive or not, which would kinda ruin the purpose.