Deinterlacing inverse telecined video

[Colek]

Hello,

I am having problem with the video. I did inverse telecine on it and it should be all good after that, but instead this is how it looks in random frames:



After running QTGMC on it this is the result on these frames:



Any ideas what to do with it? Inverse telecine should've get rid of interlacing, right?

[jagabo]

IVTC should get rid of most comb artifacts but sometimes there are orphaned fields (fields for which there isn't a complimentary field to complete the frame) that are either let through with comb artifacts or deinterlaced by some method. What software are you using? Make sure you don't resize the video vertically before the IVTC. Provide a sample of the source (without reencoding).

[Colek]

Here is the sample:

https://dl.dropboxusercontent.com/u/24509299/2.mkv

I am using AviSynth:
LSMASHVideoSource("2.mp4")
assumetff()
TDecimate()

[jagabo]

If that's an accurate representation of your source it has already been resized vertically, destroying the integrity of the two fields. You will not be able to cleanly IVTC it. But a script like this should come close:

AssumeTFF()
Blur(0.0, 1.0) #blend the two fields together
FixBlendIVTC()
TDecimate()
Sharpen(0.0, 0.6) #restore some of the vertical sharpness

Your sample script isn't performing an IVTC, just a decimation. Normally you would use TFM() before TDecimate(). That doesn't work with this video because of the disturbed fields.

[Colek]

If that's an accurate representation of your source it has already been resized vertically, destroying the integrity of the two fields. You will not be able to cleanly IVTC it. But a script like this should come close:

AssumeTFF()
Blur(0.0, 1.0) #blend the two fields together
FixBlendIVTC()
TDecimate()
Sharpen(0.0, 0.6) #restore some of the vertical sharpness

Your sample script isn't performing an IVTC, just a decimation. Normally you would use TFM() before TDecimate(). That doesn't work with this video because of the disturbed fields.

Thank you, it does the job just right. And thank you for explaining what went wrong, will note that for future