olly eebe990d20 MP4 edit lists: Use floor rather than ceil to find first sample
If the start time of the edit falls within a sample, start from that
sample rather than the next one. This ensures playback can start from
the correct point if the sample is a keyframe, rather than having to
start from the next one.

Issue: #7133
PiperOrigin-RevId: 302639115
2020-03-25 13:04:23 +00:00
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