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Old 27th September 2022, 09:39   #18  |  Link
DTL
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Join Date: Jul 2018
Posts: 625
It looks current 'starting' MPB params of MPBNumIt=2 and MPB_SPC=1.5 may be too high for SD noisy sources like VHS captures or may be other too noisy sources. So it cause significant decreasing of 'denoising' over all frame even with high enough tr and thSAD params. For such sources the MPB_SPC may be as low as 1.02..1.05 (it expected to be > 1.0) and MPBNumIt to 1. It is a bit unexpected low values so may be in future versions the internal math may be changed for more expected adjustment in range of about 1.1..2.0. Though leaving some residual noise may be used instead of 'debanding' after typical too clean degrain.

Also thCohMV param depends on pel about pel*4 so thCohMV=16 is my typical value for pel=4. If you use pel=1 it may be lower to about thCohMV=4.

Addition from 02.10.2022: It was found that using hardware motion search with NVIDIA GTX1060 card looks like sometime produces significant MVs errors and it cause significant details lost with MDegrainN processing. It is more visible if using 'high enough' tr-values like 10. May be other chips of new NVIDIA families or AMD produces better result. So currently for highest quality work only onCPU MAnalyse can be recommended.

Last edited by DTL; 2nd October 2022 at 07:10.
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