Size out_size (get_required_int (kv, "output_width"), get_required_int (kv, "output_height"));
int padding = get_required_int (kv, "padding");
int subtitle_offset = get_required_int (kv, "subtitle_offset");
Size out_size (get_required_int (kv, "output_width"), get_required_int (kv, "output_height"));
int padding = get_required_int (kv, "padding");
int subtitle_offset = get_required_int (kv, "subtitle_offset");