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Add vmaf-subsample as an alternative to probing-rate as it is more accurate while still providing a speed benefit compared to without it
Closes #806
Looks like probe-rate 3 in this example is useless as it messes up the quality so bad it just uses 8 crf which was my min while subsample doesnt seem to run into any issues with setting it a bit to high.
Testing on a 30 second 1080p clip with little motion
Target quality of 96 using x265 fast with extra-split 240 comes out to 7 scenes
default
real 3m34.966s
user 24m37.871s
sys 2m58.700s
probe 2
real 1m45.946s
user 11m48.243s
sys 1m41.285s
probe 3
real 1m44.766s
user 10m12.201s
sys 1m30.548s
subsample 3
real 2m35.967s
user 17m47.618s
sys 2m25.497s
subsample 9
real 2m8.224s
user 14m7.415s
sys 1m50.762s