--------------------------+-------------------------------------+
                |<---------------------------- the size of Opus sample ------------------------>|

                    Figure 1 - Example structure of an Opus sample containing two Opus bitstreams

        4.3.4 Duration of Opus sample<a name="4.3.4"></a>
            The duration of Opus sample is given by multiplying the total of frame sizes for a single Opus bitstream
            expressed in seconds by the value of the timescale field in t