Welcome to Nokia Support Discussions! Here you can share advice and tips with thousands of other Nokia users around the world in English. Many Nokia employees also follow and participate in the discussions, see our guidelines for more information. Everyone can search and read the discussions, but to post your own question or reply to others, simply sign in with your Nokia account. If this is your first time here, you can choose an alias to represent you. And if you don't have a Nokia account yet, please register.
You have to first convert the .3gp video file format to something else.
I'm sure there are other programs, too, but if you search the Internet for a utility by the name "3gptorawavi", and download and install it, it will do the conversion to a format (AVI) that more programs can handle & put on a DVD (the typical DVD video file format is MPEG2).