he Media Header Box.
            Let's say an Opus sample consists of two Opus bitstreams, where the frame size of one bitstream is 40 milli-
            seconds and the frame size of another is 60 milliseconds, and the timescale field in the Media Header Box
            is set to 48000, then the duration of that Opus sample shall be 120 milliseconds since three 40 millisecond
            frame and two 60 millisecond frames shall be contained because of the maximum duration of Opus packet, 120
            m