Q: Will a 3G AV composite video cable work with my iPod nano 4G?
A: The short answer is yes. While Apple changed the specifications for the video out connector with the 2007 iPod models, they have not made any further changes to the video interface on the 2008 models beyond removing the ability to charge via FireWire, which is not a charging method used by any of the AV cables that we are aware of.
Therefore, any video out cable that was designed for the “3G” iPod nano (with video), the iPod classic, iPhone or iPod touch should continue to work fine with this year’s models.
Note that we strongly recommend purchasing a cable with a reputable brand name from an actual “Made-for-iPod” manufacturer, as there have been some “no-name” cables on the market that claim video compatibility with the newer iPod models but do not actually work.
Usually the best tip-off for these types of cables are unknown brand names and low prices. You can expect to pay a minimum of $30 for a good, new set of AV cables, as the licensing and authentication requirements make it virtually impossible for a third-party manufacturer to sell them for any less than this price and still make a profit.