Frame Rate problem

[Pacificbond]

I use Movavi Video Editor.
I have converted a 50 year old 8mm film using Retro-8 Pro scanner to a digital format. Basically it copies each frame of the film and creates a jpg image.
The old film rate was 15fps. The Video editor plays these at 25fps. In order to not make it look as though the bride was running into church (and out of it!), I adjusted the film speed to approximately 60% of true rate, then added titles, fades, audio and exported as an mpeg-2 file. This file is 2:29sec long, exactly the same as the editor file.
When I then burn the mpeg-2 file as a DVD it encodes it to play at 25fps and the result is jerky, too fast and audio higher pitched. If I copy the mpeg-2 file to a DVD+R disk the DVD player sees it as a data disk and won't read it. If I play the mpeg-2 file on my computer it plays as I intended.
Any advice or suggestions please as to how old cine film can be speed adjusted onto a DVD?

[dellsam34]

You should have done frame pulldown like 3:1 in software, This would have been much easier in NTSC 30 fps you just double each frame, it's more complicated in PAL the resulting frame rate will always be an oddball one.

[Pacificbond]

Thanks dellsam34. You have now introduced a new problem for me. How do I do a "frame pulldown like 3:1 in software"?
In my mind I had the idea of somehow doubling up on each frame that will give me 30fps which is a 20% error as opposed to 15fps which is 66% error.
Leading on from this, is there any software that will morph the "missing" frame between each original frame so that the action is smooth?

[dellsam34]

Most software that convert stills to video have the option to define a frame rate pull-down based on the original frame rate (in your case 15 fps). I can't tell you which software since I've never done this task before, but I'm pretty sure there are some members here did film scanning and they have their preferred software.