An iso-file is just a disc image (a copy of a CD or DVD), not a video file. You can't convert a disc image, only the file it contains.
Get the file (or files) out by mounting the iso (can be done natively in Windows 10, needs a virtual drive program in older versions of Windows), and try all conversion programs on that file(s) until, maybe, you find one that does pick it up. But it might be sufficient to find a program that plays it without converting.
I have an old home movie in which I ripped to my Macbook pro as an .iso (also have it in .cdr file). This home movie contains a title screen with moving background in which you would then hit "play"
As an .iso file I am only able to play it in the program
"VLC" where the title screen is present. Upon conversion, the title screen does not stay enclosed in the file.
Is there a way to convert this .iso (or .cdr) to a .mov/.mp4 in which this title screen would remain along with it's original function?