[HELP] What noise is that?

[Selur]

In Hybrid is says 'Pixel aspect ratio' in your screenshot it says 'Display aspect ratio'.
=> [INFO] About pixel aspect ratios,..

Cu Selur

[Doom83]

How can I understand if files are telecined?

You look for pattern if you bob the content, read: [INFO] Interlacing patterns

after can I put up again the FR for original smoothness?

You could add interpolated frames: "Filtering->Vapoursynth->Frame->Interpolation->Frame Interpolation" (on Mac, there are way less available methods for this, than on Windows, especially with a modern gpu and vs-mlrt or torch add-on).

Obviously: If you have a real 29.97fps source (with 29.97 unique non-blended frames) and you remove frames, you will lose motion smoothness and there is nothing you can do about it.

Cu Selur

I take a look in some file, strange is 4 good frames and 1 duplicate, another 4 frames and a duplicate, and so on..so is not telecined..what I need to do? How I delete the duplicate?

[Selur]

No, that's telecine.
If it's a fixed pattern you can use QTGMC and then SelectEvery

[Doom83]

But this give without bob, original 29.97
If make TIVTC give some stripes  
Actually dont know how to set selectevery, try Tdecimate 

[Selur]

Like always, I need a small sample (with horizontal motion) to give a script suggestion.

Cu Selur

[Doom83]

Ok that a shot clip from interview, rip and untouched..4 frame and a duplicate..maybe tdecimated at 23.96 seem the good option...

[Selur]

Yes, TIVTC seems to be the right approach, so overwriting the scan type to 'telecine' should be enough.
Alternatively, you could replace the duplicates with interpolations.