tree 424a0cf8401ca22de3e50cb8ea83e3ed2a0c9115
parent 34afdef51fdbf75617252ecf6d2e3631cbab9bee
author Lin Zheng <linzhen@google.com> 1681860724 +0000
committer Lin Zheng <linzhen@google.com> 1682632257 +0000

Address VQ issue in bug aomedia:3170

Add clamping on how much frame QP is allowed to increase in tune VMAF
presets '--tune=vmaf_without_preprocessing'. The fix addressed some
corner cases where QP offset can go very high without any clamp,
such that cause VQ drop significantly. Borg test results at speed=5
qmode are as below:

testset	 avg_psnr   ovr_psnr    ssim	  vmaf
hdres2	-0.301	    -0.314	-0.304	  -0.024
hdres	-1.325	    -1.459	-1.421	  -0.06

Bug: aomedia:3170
Change-Id: I2d829e4bcc62d1acea7cafab73f0b92c171aecc9