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I don’t fully understand why c functions have a free method for every single struct type. Wouldn’t a general purpose `free` method work, or heck, just using the C free method itself.

Usually they do more than allocating a single struct. ffmpeg has its own memory management stuff that I can't remember because it's been a long time but automatically frees some other structs/file descriptors that could have been open during the lifetime of the "object/struct"

so I should probably rely on the free function, not the memScoped function?

If you're using some library that has its own `foo_free()` , yes, most likely

Unless memScope {} could intercept the underlying `malloc()` calls (from inside the lib)?

But that seems unlikely + it wouldn't handle stuff like file descriptors