I've tried everything I can think of to make this work, but am being foiled at every turn. I am not very good when it comes to this stuff, so I'm really hoping someone can help. Here's the situation:
I have an 848x480 file which I've been asked to upscale to 1280x720 and encode as an MPEG-2 in proper 16:9 format for a con. TMPGEnc is my usual MPEG-2 creator, but it seems very unhappy about spitting out an HD resolution MPEG-2, and flatly refuses even to try.
Without going into vast detail about my many failed experiments and research into solutions, what is the proper way to achieve both the MPEG-2 encode and the upscale? Is there another MPEG-2 encoder I can use? Am I being asked to create a file that I can't actually deliver?

