ecification specifies the fundamental way of the encapsulation of Opus coded bitstreams in ISO Base Media
    file format and its derivatives. The encapsulation of Opus coded bitstreams in QuickTime file format is outside
    the scope of this specification.

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2 Normative References
    [1] ISO/IEC 14496-12:2015 Corrected version
        Information technology — Coding of audio-visual objects — Part 12: ISO base media file format

    [2] RFC 6716
        Definition of the Opus Audio Cod