nnedi3 picture shift - Githubissues

bjin / mpv-prescalers

prescalers for mpv, as user shaders

GNU Lesser General Public License v3.0

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nnedi3 picture shift #25

Closed ghost closed 6 years ago

ghost commented 6 years ago

Hello it seems that the current nnedi3 implementation shifts the image a little bit. Here's what I did:

mpv --no-config --screenshot-format=png --glsl-shaders=~/.config/mpv/shaders/nnedi3-nns16-win8x6.hook --start 00:02:02.455 my.mkv
Hit s and ^s
Scale the original one with vapoursynth.
convert -filter box -resize 400% -crop 800x800+0+0 +repage in.png out_crop.png for both
convert -delay 30 *crop.png out.gif What I get:

PS: Oh yeah, I compared to a plain mpv lanczos upscale too (so vapoursynth isn't the bad one).

bjin commented 6 years ago

This is expected, both nnedi3 and RAVU shifts the picture by half pixel. Add --no-scaler-resizes-only to correct it.