I tried ffmpeg. I just could not get it to work. Actually the uncompressed file is already cropped and resized so I was looking for a one to one conversation. Every time I tried to export under mpeg2 it would either resize the frame or error and quit the export.
Fortunately someone in another forum suggested using Adobe Media Encoder. I used that and was able to get it on the first export.
Thank you so much for your input and I will give your suggestion a try.
best