I followed this guide to convert videos for my evo, except I kept the aspect ratio the same as the original video. I threw my Back to the Future 3 blu-ray rip on there and played the train chase scene without a hitch.
http://www.knowyourcell.com/htc/htc...deos_and_transfer_them_to_the_htc_evo_4g.html
http://www.knowyourcell.com/htc/htc...deos_and_transfer_them_to_the_htc_evo_4g.html