Options
type flag = [ | `Encoding_param| `Decoding_param| `Audio_param| `Video_param| `Subtitle_param| `Export| `Readonly| `Bsf_param| `Runtime_param| `Filtering_param| `Deprecated| `Child_consts
]type 'a entry = {default : 'a option;min : 'a option;max : 'a option;values : (string * 'a) list;
}type opt = {name : string;help : string option;flags : flag list;spec : spec;
}type 'a getter = ?search_children:bool -> name:string -> obj -> 'aval get_string : string getterval get_image_size : (int * int) getterval get_dictionary : (string * string) list getter