Denoise before Upscale or After?

[VideoFanatic]

I have a 320 x 480 video that I want to make Bluray compliant at 720 x 480. This is what I use to upscale it:

turnleft().nnedi3(dh=true).turnright()

Should I denoise before or after I upscale?

[sanlyn]

Before.

[VideoFanatic]

I'm using McTemporalDenoise and QTGMC. Should I use them both before upscaling or just McTemporalDenoise? Is this OK?

setmtmode(5,9)
Mpeg2Source("J:\2 = New\z = Encode\Raw January 12 1998.d2v", CPU=6)
setmtmode(2,0)

McTemporalDenoise(settings="medium", interlaced=true) # Sharpening strength is 150

turnleft().nnedi3(dh=true).turnright()

AssumeTFF() # or AssumeBFF() depending on the source
QTGMC(Preset="Super Fast") # Removes interlacing artefacts. Strangely this is faster than Ultra Fast
SeparateFields()
SelectEvery(4,0,3)
Weave()

Tweak(Bright=10, Sat=1.0, Cont=0.8, Hue=0.0, Coring=False)

Crop(10,0,-8,0)
AddBorders(18,0,16,0, $000000)

[Vidd]

Deinterlace with QTGMC before the upscale.

If you were doing a spatial denoise, deinterlacing would need to go before the denoise filter.

[2Bdecided]

deinterlace, denoise, upscale
or
deinterlace, upscale, denoise
or
deinterlace, denoise, upscale, denoise

depending on the qualities of the noise and upscaler.

With QTGMC and nnedi3, beware of plastic/chiselled looking video on the output. I usually put up with the plastic look, but others may prefer another approach. e.g. a simple horizontal resize with maybe a very gentle interlaced denoise (or bob/denoise/de-interlace denoise) will sometimes look better (the output will be interlaced).

Cheers,
David.