Serious lack of information there. You said MPEG-2, so I'm assuming you're making a video DVD. Projecting to how large? What is the source footage -- what codec, what original source? What is your editing timeline set to?
I'm in NTSC land, but I think a PAL DVD is only 720x576px. That will not fill most standard computer monitors without a blowup, let alone if projected to a huge screen.
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