As i said, the videos are stored on the second data track. Actually, the file index is there in the 1st track, but they link to data in the 2nd track. Same with the ADP files, which are the adpcm sound files, used by the videos.
So if you have a iso/mp3 copy, its most likely one ISO file and a bunch of mp3s. In which case you have only ONE data track, meaning you can't copy over or even open the video files cause their data does not exist on your copy.
Or in short, you are shit out of luck.
ps cpkplay sucks, use mplayer.