Oh, yes. When I wanted to fiddle with OpenGL (and later SDL), I was baffled to find that absolutely everything documentation-wise was for C++.
EDIT: Sorry, "documentation" was probably the wrong word to use here. I meant "learning resources".
Even ffmpeg's own documentation outside of what they generate for their API is rather sparse if you wish to do more than use it on the command line.
If is after all called Visual C++.
Do you mean tutorials and the like? The official docs are pure C for both.
C.f. the official SDL API doc: https://wiki.libsdl.org/APIByCategory
The official docs are C, of course, because the API is C. But the docs are rather abstruse for a beginner, and really become useful only well after you’ve gotten your bearings. (e.g. my personal beef: function names tend to be two nouns with no verb to say what the thing actually does, so you look in the docs and it says it “binds” noun A and noun B, with no explanation of what “binds” means in context, which direction the data binding goes, whether it persists, etc.)