4 * Needs to make an annodex BOS page.
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5 * Need timebase and UTC from CMML stream.
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6 * Needs to make an anxdata page (same serial as annodex) for each stream
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7 * Need to know how many following headers.
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8 * Need to know granule rate.
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9 * Additional header fields - where from ?
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10 * Needs to ensure a CMML Stream ?
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11 * Needs to put an annodex BOS after the anxdata BOS's
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12 * Then mux pages as normal, but take the BOS flag off of the codec headers.