What is the running time of your movie?
A standard DVD can hold about 80 minutes of video at full quality. Fitting to disc can squeeze a bit more onto a disc.
A standard BluRay disc can hold about 2 hours of video at full quality.
The movie length is 1 hour 50 minutes. I have selected "Fit content to available space", just as I did when creating the Blu-Ray ISO. PE indicates that is looking to create a 4.35 GB file,which should easily fit on a 4.7 GB DVD. I just tried opening the same project on a different computer and same build of PE, with the same result.
I believe I've discovered a freak bug in PE Version 14.1 (20151208.daily.895401). The exact length of the movie is 1:50:16:08. I discovered that if I increase or decrease the length of the video by just 1 frame, I no longer get the error, and am able to successfully create a DVD ISO image!!! Go figure.
I would be interested in knowing if anyone else can duplicate this fault!
That's an interesting find! I wonder if it's related to i-frames on MPEGs.
But I'm glad you were at least able to find solution!