Papai, when I'm wrong, I apologize, also with my friends... and yes, thanks to your help, I avoided two or more days of futile conversion...

I've redone the same clip, this time only using ONE capture... if you could still see those lines, it's clearly NOT in the median process... here you are the link

But, if you could still see those lines in this clip, but NOT in the single capture at original resolution, the problem lies in the denoise script... strange, because I used the same script, verbatim, for both JP2 and these clips...