Thanks for the reply, but I may not have explained myself very well - the resolution is entirely correct, but it doesn't look as if the artwork is sized to cope with 4:3 (rather than 16:9) screens, thus the (text-filled) borders at the top and bottom of the screen!
Ohhh and also if you have sound problem with the "-o hdmi" witch is sound true the HDMI connection. You can change it to "-o local" to give audio true the jack stick.