here is a 4 pole 3.5mm plug to 3 pole 3.5mm plug cable i made for a portable dvd-a player. the 4 pole plug is ground, l, r, and interlaced video. i grounded the 0v and video leads at the source end, since it is only for audio (the dvd-a player has a 16:9 lcd). the cable is blue starquad covered in black flextech, the plugs are switchcraft, and kester silver solder. this is only my third cable, and i don't know if this has been tried before. i made this to use with a sr-71 amp, and it works great.
