e independently decoded i.e. every Opus sample is a sync sample. Therefore, the
                Sync Sample Box shall not be present as long as there are no samples other than Opus samples in the same
                track. And the sample_is_non_sync_sample field for Opus samples shall be set to 0.

            4.3.6.2 Pre-roll<a name="4.3.6.2"></a>
                Opus bitstream requires at least 80 millisecond pre-roll after each random access to get correct output.
                Pre-roll is indicated b