[HELP] Resize doesn't seem to be working

[Selur]

so how did you know it was these digits to choose ?

Content is NTSC and clearly not 16:9 so probably 4:3, it's last physical form also was probably either VHS or DVD, so it's probably either:
a. a PAR of '38800/42651'
or
b. a PAR of '8/9'
For more details and links see: [Info] About pixel aspect ratios,..

ok when I use a filter.
but when I don't, as it's the case with the PAR example as you told me previously (as there's no 'filtering' tab) ? It's not possible ?

As long as you don't set 'Base->Processing->Video' to 'passthrough' you can use the 'Filtering->Vapoursynth Preview' to check the effect.

Cu Selur