Deblocking?

[DrDeceit]

I am currently encoding a 1080p movie... source is 34 Mbps

Re-encoding parameters, 1920x1080

CRF 16

Ref frames=5 B frames=6
8x8 transform, CABAC, weighted p frames
B pyramid, b frames optimal, Trellis always
uneven multi hexagon, motion est range 64, Subme=10
Partitions=all, deblocking = 6, deblocking = 6

U notice my deblocking is 6:6, I chose that because I was aware it improved compression significantly

but i keep reading and people say it adds blur to the video

I do not have the deblocking FILTER enabled, just the advanced h264 settings

[poisondeathray]

Yes it will be more "blurry" and the filesize will be smaller than if you used the same settings with lower or negative alpha/beta deblock values

If your goal was improving "compressibility" , you would be better off using dedicated noise and grain processing filters . It will yield better results and more control

[jagabo]

Look at small details in dark areas. Those will suffer the most. And use a program where you can flip back and forth between the two videos while zoomed in.