My workflow for this:
Make a standard def timeline anamorphic. Set the compressor to ProRes and set the render settings to high precision YUV and the motion settings to best. Edit your show from your ProRes footage captured however. Render and send to an uncompressed QT movie, send that to Compressor, tell it it’s 16×9 if it doesn’t recognize that, turn on the frame controls, set anti-aliasing to 50 and motion controls to better, deinterlace, and go.
You will get the absolute best quality DVD you can imagine.
Have a wonderful day.