I just received a call from a client who wants there video on MPEG5. I have yet to return their call as I am not sure what is MPEG5 is, I've listened to the message several times and they have clearly asked for MPEG5 as part of their requirements. Any ideas?
You're client is most likely wrong. The only new mpeg format that I can think of is the new one coming out of the new JVC HD7 cam.... I don't know what they are calling it, but I doubt your client was talking about that.
They may specify additional materials destined for MHEG5. In some parts of the world, this is the complimentary material you can go into on a digital set top box or TV whilst your programme is running. It is usually station branded, so if they want this, you'd need to fit in with a particular brand of system, like DVB-T or Liberty.
There is no portable player that supports MPEG 5 to my knowledge, it's a fair certainty that they want MP4, as DJ suggests. MPEG 3, 5, and 6 have never been defined nor implemented by MPEG LA, and likely never will be.