23.05.2020, 21:06
Actually, what I posted above about the default behavior of OverrideAlgo is incorrect.
If no OverrideAlgo is specified ("None" in VapourSynth), then it's 13 by default for Film and Weak tuning settings (I think, the documentation isn't clear for the "Weak" tuning), 2 for Animation tuning, and 23 for Smooth tuning. Unless the user specifies something else for OverrideAlgo... it "overrides" the default algorithm for the specified tuning setting.
So for VapourSynth, the issue is just that "Strong" and "Intelligent" options are mixed up, as shown above.
AviSynth should probably have a "None" option added. (In addition to fixing the problem that the tuning option doesn't get set in the AviSynth script.)
If no OverrideAlgo is specified ("None" in VapourSynth), then it's 13 by default for Film and Weak tuning settings (I think, the documentation isn't clear for the "Weak" tuning), 2 for Animation tuning, and 23 for Smooth tuning. Unless the user specifies something else for OverrideAlgo... it "overrides" the default algorithm for the specified tuning setting.
So for VapourSynth, the issue is just that "Strong" and "Intelligent" options are mixed up, as shown above.
AviSynth should probably have a "None" option added. (In addition to fixing the problem that the tuning option doesn't get set in the AviSynth script.)