Changes to maximum gf/arf interval.
This patch puts in an adjustment to the maximum gf/arf interval based on the active q range. It sets a fixed baseline maximum of 16 but can drop this down to 12 at lower q. This required some re-ordering in the first pass code to insure we have a Q range estimate before defining the first gf sequence. The main gains seed are int he STD hd set on 50fps clips where previously the interval could rise as high as 25. On the std hd clip the gains are around 2.8% with limit set to 300 frames. When combined with the one shot rate control flags we get combined of: derf 1.55% (limit300), yt 7.25%, hd 5.17% std-hd 5.84% (limit300) Change-Id: Ib380d51354511f2ff0f171a8df4e74291c0421f9
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