a href="#4.3">4.3</a> Definitions of Opus sample
        <a href="#4.3.1">4.3.1</a> Sample entry format
        <a href="#4.3.2">4.3.2</a> Opus Specific Box
        <a href="#4.3.3">4.3.3</a> Sample format
        <a href="#4.3.4">4.3.4</a> Duration of Opus sample
        <a href="#4.3.5">4.3.5</a> Sub-sample
        <a href="#4.3.6">4.3.6</a> Random Access
            <a href="#4.3.6.1">4.3.6.1</a> Random Access Point
            <a href="#4.3.6.2">4.3.6.2</a> Pre-roll
    <a href="#4.4">4.4</a> Trimming o