This is a cross-post from http://aif.teamsiems.com/
I think I finally figured out the screen resolution I need to fill a youtube video viewing box. I set my screen and FSX to 1280 x 720. It makes everything pinched, but the outcome is widescreen 16:9. I also converted the video from Fraps’ AVI to MPEG4 using widescreen setting for both input and output.
This also gave me the opportunity to install an iframe plugin for WordPress so I can use YouTube iframes and WordPress doesn’t zap the HTML. Thanks to Túbal Martín for his plugin and shortcode and the link to YouTube parameters.