Compute multiple global motions and pick best by error adv.
Modify ransac to keep the N best global motions by num_inliers and
variance rather than a single one. Compute the error advantage for
each in encode_frame_internal(), and use the best as the global motion
for that pair of <target, reference> frames.
Improvements for different values of N:
N %PSNR gain on lowres
1 (current impl) 1.287
5 files changed