My TV can not show videos from USB key ... taken with Canon Ixus camera or from Iphone. Jpeg photos works good.

I would like to buy a new Philips TV but when i bring the UBS into the TV ... videos will not show. And Sony tv can not. Samsung can. Shops say that philips do not backup MOV files.
Can anybody help me ?

Then I bought a new Philips Medieplayer P3000 (something) and this device can not play or shop MOV files.