What you do need to make a DVD work for a DVD Player is a program called Devede.
1 - Open up Ubuntu Software Centre and in the search field type devede and it will be shown in the results.
2 - Install that program.
3 - Start the program and then you will see a series of options.
4 - choose Video DVD: Creates a video DVD suitable for all DVD home players
5 - You need to add the file to create an .ISO so it will work in a DVD Player.
6 - In the Files section, click ADD and then search for the file you want.
7 - Once you have added the file, click on Advanced Options
8 - If the file exceeds 99%, then click on Adjust Disc Usage
9 - Click on the Video Options tab and select Scale Picture so there are no black bars (Letterbox Effect)
10 - Choose where you want to save the finished .ISO
11 - Click OK
The .ISO will now start to be processed, once it has finished you will then need to burn the .ISO to a blank DVD. I advise that you burn the .ISO at the slowest speed possible to ensure the best results.