Burn .flv DVD movie in Linux with DeVeDe

I got few .flv movie and want to burn it into DVD for my DVD player and watch in TV. I tried using k3b but it can't recognized the video format. Then, I tried it on windows 7 with Nero. Still Nero would not recognize the video format. After googling around and I found this article "How to create DVD movies in Linux with DeVeDe" click here. I installed the program and follow the steps. Finally I got the .iso file. I used k3b to burn it and it is.