AVRational check_frame_rate(const AVRational *p, double frame_rate);
AVRational to_sample_aspect_ratio(Asset *asset);
AVRational to_time_base(int sample_rate);
AVRational check_frame_rate(const AVRational *p, double frame_rate);
AVRational to_sample_aspect_ratio(Asset *asset);
AVRational to_time_base(int sample_rate);