60i back to 50i

[Boulder]

I have a concert Blu-ray I'm trying to clean up and to me it looks like it was shot at 50i. At first I just tried using QTGMC and encoded as progressive at 59.94 fps, but it is clearly jerky.

Is there any clean or even cleanish way to get back to 50i (or 25p with motion blur will do as well)?

https://drive.google.com/file/d/1eAeCbieQ4f09-YhfRy3f-1KlFOZVtN9W/view?usp=sharing

[johnmeyer]

I just played it and didn't see any jerkiness. I also looked at it field-by-field as well as frame-by-frame (I viewed both, side-by-side) and did not see any issues or problems. It looks just fine to me in 60i. I realize you live in PAL-land, but assume you can play 60i material without a problem. What makes you want to spend time doing a conversion? The original looks fine to me.

[hello_hello]

I think it's field blended, although if you do this....

AssumeTFF()
SeparateFields()
A = SelectEven()
B = SelectOdd()
StackVertical(A, B)

On the scene change the 2nd/bottom field switches to "scene 2" first, and both fields have some blending on the scene change, so I'm wondering if it was edited after it was converted to 60i, or maybe it only happens on that one scene change. If it's the former there might be some blending left behind around scene changes. SRestore seems to need a second or two to find a new blending pattern.

De-interlacing to 60p doesn't seem to result in any duplicate frames though, which I assume would be because there's always blending in one field or the other, so if anything it should be more blurry than jerky.

Disclaimer:
I'm not implying you have to downscale, although I would after deblending as it only keeps single fields interpolated into full frames.
I downscaled in two steps for the samples to speed up the de-interlacing a bit (my PC is slow).

Spline36Resize(1280,1080)
QTGMC()
Spline36Resize(1280,720)
SRestore()

There's enough motion blur for 25p to look natural to me.
cohen 25p.mkv (https://files.videohelp.com/u/210984/cohen%2025p.mkv) (7.4 MB)

Spline36Resize(1280,1080)
QTGMC()
Spline36Resize(1280,720)
cohen 60p.mkv (https://files.videohelp.com/u/210984/cohen%2060p.mkv) (8.2 MB)

[Boulder]

Thanks a lot for the idea, I did experiment with SRestore shortly but I was not very sure of what I should expect out of it. Downscaling is not a problem since the source has very little actual detail and 720p would be preferred anyway.