How to get a high res snapshot of an mpeg video?

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http://ubuntuforums.org – In a nutshell, I want a "good" snapshot of an mpeg2 video that I can use as the startup image of a dvd I am authoring. More info that might be useful: I edited a PBS broadcast and exported it to a dvd ready mpeg using openshot in the DreamStudio 12.04 derivative of Ubuntu. I'm using Bombono to author the dvd. I've taken snapshots using VLC and Mplayer. The snapshot looks great in imageviewer even at full screen but when I author the dvd the snapshot is so blurry that I would be better off just using a solid color background. Deinterlacing in vlc doesn't imporove things at all (Hardware)