public static extern int av_opt_get_q(void *obj, string name, int search_flags, libavutil.AVRational *out_val);
public static extern int av_opt_eval_q(void *obj, libavutil.AVOption *o, string val, libavutil.AVRational *q_out);
public static extern int av_find_nearest_q_idx(libavutil.AVRational q, libavutil.AVRational *q_list);
public static extern sbyte *av_ts_make_time_string(System.Text.StringBuilder buf, long ts, libavutil.AVRational *tb);
public static extern int av_parse_ratio(libavutil.AVRational *q, string str, int max, int log_offset, void *log_ctx);
public static extern int av_parse_video_rate(libavutil.AVRational *rate, string str);