I think there's LOTS of media out there, but there doesn't seem to be easy ways to convert it.
There was probably a renaissance period when conversion equipment was being actively developed and available, but that time is probably gone. For example I think a good film scanner would be the Nikon Super Coolscan 8000 ED, but current state of the art falls far short. For film, vcr tapes and more we should be doing so much better.
I have old family super-8 films that are kind of convertible, but not the magnetic sound strip.
unrelated but maybe interesting...
I had a colonoscopy and had to empty my system.
I had 1/2 gallon of this fluid to drink the night before, and the other 1/2 gallon to drink the day of. At that point my digestive system was empty.
I will say with an empty system I felt energized and a lot more clearheaded.
I wonder if doing this from time to time is helpful to your system, and furthermore if eating smaller portions would be helpful to my energy levels.