摘要： AVStream 中的time_base 为帧率倒数。数据结构是 typedef struct AVRational{ int num; ///< numerator int den; ///< denominator} AVRational;打印看结果是 num = 1, den = 23. 每秒23帧。关于 av_q2d源码中/** * Convert rational to double. * @param a rational to convert * @return (double) a */static inline double av_q2d(AVRation... 阅读全文