. Magix ( AiST ), Adobe and Avid are better than Sony but, all have a limit in Exporting.
These editors "all" have the option of Encoding Directly to DVD; use THAT function.
It is a common problem. Codec's and video editors for the most part do not get along with each other.
MKvMUX, MP4encode, Virtual Dub and others are designed to take advantage of High-Compression; editors are not!
Save your project on a DVD in a DVD Format and let the Encoders designed to Rip and Encode
do the Final Step for you.