Have you tried importing into an actual video editing program?... like Premiere??
That software is specifically designed to output video.
What about "Exporting" the animation as uncompressed .avi or some other video format and then import that into the video editing program to match final specs needed?
Just open the original project FLA, file->export movie->AVI (uncompressed) and set the dimensions as you mentioned. After you get the movie exported from flash, convert that AVI (already the proper size) to the format you need.
If you have the Adobe Suite then you have Adobe Media Encoder. It supports MPEG2 (HDV-HD1 is just a specific set of settings for MPEG2). It's pretty darn easy to set up. No reason to pay for more software if you already have it.
I'm going to cry ... for two days i was looking for some free software to make exact this thing - i dind't find any working properly so i bought Sothing SWF to video convertor ... and you are telling me, that there is implemented function inside Adobe Flash itself? :-D I'm an idiot, well :-) but thanx for this info.