f Actual Duration
    <a href="#4.5">4.5</a> Channel Mapping
        <a href="#4.5.1">4.5.1</a> ISO Base Media native Channel Mapping
        <a href="#4.5.2">4.5.2</a> Composition on all active tracks (informative)
    <a href="#4.6">4.6</a> Basic Structure (informative)
        <a href="#4.6.1">4.6.2</a> Initial Movie
        <a href="#4.6.2">4.6.3</a> Movie Fragments
    <a href="#4.7">4.7</a> Example of Encapsulation (informative)
<a href="#5">5</a> Author's Address

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