I attempted to burn a .MP4 video file as a DVD. Burn indicated the file must be converted to MPG. I complied and allowed the conversion. Now at a later time if I attempt to use the MPG file Burn converted it still ways the file can't be used and must be converted. Again. So I allowed it to convert the MPG to another MPG. And again if I use the new converted MPG Burn complains again.
It doesn't recognize the the MPG is the right format and insist on converting it each time you attempt to use it.