Try this, but for HD MPEG4 clips you will need a fast, stable
and healthy internet connection!
Important to note you may have to do this is in segments
as it will only convert each segment upto 150mb max file size.
Which equates to approx 10 mins of SP DVD quality

http://media-convert.com/

Scroll down the site to the "File".Browse option and insert your MPEG4
To the immediate right is options to choose "Input format", obviously
use the drop down to select "MPEG4".
Then scroll down to "Output" format and choose "DVD PAL".
Click the "OK" button