Iterate over all AVOptions belonging to obj.
@param obj an AVOptions-enabled struct or a double pointer to an AVClass describing it. @param prev result of the previous call to av_opt_next() on this object or NULL @return next AVOption or NULL
See Implementation
Iterate over all AVOptions belonging to obj.
@param obj an AVOptions-enabled struct or a double pointer to an AVClass describing it. @param prev result of the previous call to av_opt_next() on this object or NULL @return next AVOption or NULL