Anyone developed for large-format screens using embedded video clips?

I’m developing a Flash piece for a large format plasma (1360x765) and will be using embedded video clips within Flash. The final video clip I’ll be embedding will be delivered on 10-bit 720x486 format (standard -not widescreen)… -does anyone have experience with using video that will need to be displayed in a larger format than what it is delivered in? I’m thinking the image quality will not look good at all… -problem is, I can’t test it without purchasing the *&$ video! $$$$$$…

anyone? anyone? am I in the wrong forum? help!

Lisa