Return an AVClass corresponding to the next potential AVOptions-enabled child.
The difference between child_next and this is that child_next iterates over _already existing_ objects, while child_class_next iterates over _all possible_ children.
See Implementation
Return an AVClass corresponding to the next potential AVOptions-enabled child.
The difference between child_next and this is that child_next iterates over _already existing_ objects, while child_class_next iterates over _all possible_ children.