these have the grouping_type field
                set to 'roll'. If any Opus sample is contained in a track fragment, the Sample to Group Box with the
                grouping_type field set to 'roll' shall be present for that track fragment.

                For the requirement of AudioRollRecoveryEntry, the compatible_brands field in the File Type Box shall
                contain at least one brand which requires support for roll groups.
<a name="4.4"></a>
    4.4 Trimming of Actual Duration
        Due