Question of resize method?

[andrewschen]

I checked both AviSynth / VaporSynth scripts in different Crop/Resize -> Resize settings, they seems ok.
But the issue still exists.

So I tested the following cases:



1. Using AviSynth resizer

Crop/Resize -> Resize: 7 - gauss
Avisynth -> Line -> Resizer: spline64
v.s
Crop/Resize -> Resize: 10 - bicubic spline
Avisynth -> Line -> Resizer: spline64

x264 CRF24 720p encode, preset veryslow.

In this case, output file size is different, but the difference is quite small.
Visual quality is .... ok? Since both files look like the result of spline64 resizer.
It's acceptable, but I don't think it's working correctly, since the file size is not the same.



2. Using Vaporsynth resizer

Crop/Resize -> Resize: 7 - gauss
VaporSynth -> Line -> Resizer: fmtconv, spline64
v.s
Crop/Resize -> Resize: 10 - bicubic spline
VaporSynth -> Line -> Resizer: fmtconv, spline64

x264 CRF24 720p encode, preset veryslow.

In this case, output file size is apparently much more different, (gauss+spline64) file is smaller than (bicubic spline+spline64) by about 11~12%. (53MB vs 59MB)
And the visual difference of output files is pretty much like gauss v.s bicubic spline, basically based on the setting of Crop/Resize -> Resize.
It seems like VaporSynth resizer is almost not functioning. (I think It still does....since file size will still a little bit different between files resized by different vaporsynth resizers, so it's working, just not working correctly)