Problem with video

Because I changed the pictures for better quality, I also had to remake a video which uses them. This went fine but then I had to make it work in Ren'Py and this requires some coding that I didn't know and it's the first time I didn't manage to find a solution for something in Ren'Py without asking people.

I started thinking about using another software, Visual Novel Maker, which is just released now, but soon after I did get a reply to my problem and it's actually not so complicated.

What I wanted to do is have a video play in the background and have text appear on screen at the same time. This requires different coding than just playing a video.