All you have to do is to take any video, put in https://video-converter.com/, set the resolution to DVD, and press the Settings button next to the resolution dropdown and set the video codec to MPEG-4 (it won't work with anything else based on what I've seen). (Make sure it's an MP4 or other file name DVD players read.)

Download your converted video and make sure to burn the video to the DVD, or else DVD players won't read it! Also, you need a computer or laptop with a disc drive with the ability to burn information onto discs in order for it to be burnt.

Have fun!

WARNING - PLEASE REMEMBER, BURNING IS PERMANENT! YOU CAN ONLY OVERWRITE FILES WITH THE EXACT NAME OR ADD NEW ONES. YOU CAN'T EDIT FILES ONCE THEY'RE BURNT ONTO THE DISC, SO MAKE SURE YOU NAMED THE FILES CORRECTLY.