Fix to frames considered in arf boost calculation.
For a chosen interval "i" the existing arf boost calculation examined frames +/- (i-1) frames from the current location in the second pass. This change checks to make sure that the forward search does not extend beyond the next key frame in the event that the distance to the next key frame is < (i - 1). Small metrics gains on all our test sets but these are localized to a few clips (e.g. midres set psnr-hvs sintel -2.59% but overall average was only -0.185%) Change-Id: I26fc9ce582b6d58fa1113a238395e12ad3123cf6
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