Sorry but that won't work, because the miniDP->DVI adapter does not contain the analog signals necessary to make that work. The only option that I am aware of is the minDP->VGA adapter and a VGA->composite/s-video conversion box.You should be able to go Display port to DVI Connector and from that DVI down to a composite connection. The same could also hold true for DP to VGA. You will have trouble playing copy protected content though.
Here is something the Apple store has;
http://store.apple.com/us/product/M9267G/A
Sorry but that won't work, because the miniDP->DVI adapter does not contain the analog signals necessary to make that work. The only option that I am aware of is the minDP->VGA adapter and a VGA->composite/s-video conversion box.
Does the miniDP on the new MBs and MBPs put out DVI-I or DVI-D ?
Very interesting, so there are a fair amount of old HDTVs and reg TV's that only have composite, s-video and perhaps a VGA port. This means the only bet is miniDP to VGA to composite (assuming there is no VGA)