Random Access Mode Improvement

Description

Improvements to the Random Access mode

Issue

Fixes issue #2070 (closed)
Fixes issue #2078 (closed)
Closes #2041 (closed)
Closes #2023 (closed)
Closes #1778 (closed)

Author(s)

@chkngit @hguermaz @PhoenixWorth @ccccheung @dxyliu

Performance impact

Preset	Y-PSNR	Y-SSIM	VMAF NEG	Speed Dev.
MR	-0.02%	0.06%	-0.78%	36.87%
0	-0.14 %	-0.04%	-0.71%	35.10%
1	0.11%	0.63%	-0.71%	42.85%
2	0.26%	0.44%	-0.32%	38.34%
3	0.09%	1.05%	-1.48%	37.81%
4	0.36%	0.41%	-0.58%	39.97%
5	-0.02%	1.48%	-0.98%	26.33%
6	-0.10%	-0.30%	-0.22%	20.91%
7	0.07%	0.45%	-0.71%	14.97%
8	0.39%	-0.01%	0.07%	15.40%
9	0.44%	0.40%	-0.04%	15.71%
10	0.10%	0.76%	-2.23%	3.48%
11	-0.98%	-1.02%	-2.05%	-1.14%
12	-2.66%	-2.74%	-3.88%	-4.37%
13	-1.68%	-1.40%	-2.26%	-2.21%

• quality
• memory
• speed
• 8 bit
• 10 bit
• N/A

Test set

• obj-1-fast can be found here
• other
• N/A

Merge method

• Allow the maintainer to squash and merge when PR is ready to create a 1-commit to the master branch. The maintainer will be able to fix typos / combine commit messages to create a more readable 1-commit message or use whatever is stated in the 'Description' section
• I will clean up my commits and the maintainer shall use 'rebase and merge' to the master branch