Baked-in Interlacing?

[Jared]

Hi. I have several video files that appear to have a baked-in interlacing that I'd like to fix. The clips are showing as progressive scans at 720x540. I'm guessing they came from a DVD and were resized and deinterlaced improperly?
Here's a short example of a clip: [URL="https://drive.google.com/file/d/1EwTouWEtvHDWTzMs8XZu_tkRpB0Pb-vX/view?usp=sharing"]
[Attachment 83487 - Click to enlarge]

I have FFworks w/ffmpeg running with it and have tried several things but nothing as made it look much better. Temporal Field Interlacing made it look smoother but quite blurry. Thoughts?
Thanks
Jared

[davexnet]

Debilinear helps quite a bit.
Avisynth script:

lwlibavvideosource("C:\Users\davex\Downloads\testclip.mov")
debilinear(width,480)
qtgmc(preset="medium")

[Jared]

Debilinear helps quite a bit.
Avisynth script:

lwlibavvideosource("C:\Users\davex\Downloads\testclip.mov")
debilinear(width,480)
qtgmc(preset="medium")

Thanks Dave. I'm on a Mac so I believe I'll have to try something else. That said, I use FFworks w/ the FFmpeg engine.
It appears that Debilinear does more than resize but just as a test, using FFworks, I resized the vertical resolution to 480 and then used YADIF to deinterlace.
Here are the results...On the left is resized to 480 and on the right is after YADIF. Looks pretty good.

[Attachment 83504 - Click to enlarge]
But on this frame, there's vertical camera movement and the right frame with YADIF actually looks worse. Thoughts? I really appreciate the help.

[Attachment 83505 - Click to enlarge]

[davexnet]

Yes debilinear is a desampling function, to undo the effects of the resize (presumably) from 480 > 540.
Once interlaced material is resized the two fields are co-mingled and it's saved as a progressive file - it's pretty much ruined.

By using a desample, you get back (more or less) the two fields which can then be separated and processed properly.

Other methods involve reducing the height (to decrease the artifacts) then resizing it back.
For example, reduce the height by half then upsize

bicubicresize(width,270).bicubicresize(width,540)

There are other members of the forum here who know this stuff pretty well. You may get further info on this

[poisondeathray]

avisynth is available on a Mac now, there are MacOS releases
https://github.com/AviSynth/AviSynthPlus/releases

Alternatively, vapoursynth is probably more cross platform friendly, and can use descale for vapoursynth
https://github.com/Irrational-Encoding-Wizardry/descale

There is bit of a learning curve for either avisynth or vapoursynth . There might be some GUI's like hybrid which bundle everything and make it easier to use at first

I do not think ffmpeg/libav have descaling kernels yet

[Selur]

Side note:
a. There is no Hybrid version for MacOS that supports descale atm. and the last MacOS version of Hybrid is rather old.
b. Avisynth in MacOS is basically a no-go unless you modify and compile each filter manually. => Vapoursynth has more hope for success; don't know any native gui for Vapoursynth on Mac

[Jared]

I appreciate you both helping out. I tried to get Avisynth to work but failed. I may try Vapoursynth as it seems to have some good instructions. I may be able to get it going, copy some code from here and slowly figure out how to use it. We'll see.

At the same time, I think I'll approach the rights holder of this media and explain that they messed up their own footage.
I'm hoping they have copies of the original telecined (480i?) video.

Again, thanks for the replies. I always learn something here.