Yaowu Xu ee5d79995e Move computation up to frame level
This is to avoid redo the same calculation repeatly, and also allow
easier adjustments for further experiments.

This commit shall have no effect on quality/compression.

Change-Id: I4460acf5c808ff5518da18d21e002c5da58af857
2015-02-10 15:41:52 -08:00
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