Adjustment to scene detection and key frame.
For 1 pass vbr: use higher threshold on avg_sad and force key frame under scene cut detection if above the threshold. Allow it for speed >= 6 for now, since it does not use the full nonrd_pickmode partition (as in speed 5). Improves quality somewhat on scene cut frames. Neutral on overall metrics and fps for speed 6 on ytlive set. Change-Id: I12626f7627419ca14f9d0d249df86c7104438162
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