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Fix sample time calculation for times >= 2^32. #24

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Fix sample time calculation for times >= 2^32. #24

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Commits on Sep 22, 2018

  1. Fix sample time calculation for times >= 2^32. 

    In MP4Track::GetSampleTimes and MP4Track::GetSampleIdFromTime, sampleCount is a 32 bit value that is later multiplied by sampleDelta in 32 bit math. We need this multiplication to happen in 64 bit math to handle long tracks, so promote sampleCount to a 64 bit variable.
    @enzo1982
    enzo1982 authored Sep 22, 2018
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