How to properly fix this chroma abberation issue?

[elektro]

What Avisynth filter + settings would you recommend to best fix this chroma issue (especially the red color shifting from the mic)? I included a sample from the original (interlaced AVC) and a sample with a deinterlaced version with QTGMC Preset Slow (progressive AVC). Thanks.

[jagabo]

Your source is messed up. The chroma of two fields has been blended together -- but not fields from the same frame. And weirdly, the chroma is BFF whereas the luma is TFF.

LWLibavVideoSource("interlaced.mp4", cache=false) 

l = AssumeTFF().SeparateFields()
c = AssumeBFF().SeparateFields()
MergeChroma(l, c)

StackHorizontal(GreyScale, StackVertical(UtoY(),VtoY()))
BilinearResize(width/2, height)

Y on the left, U at the top right, V at the bottom right:


[Attachment 60263 - Click to enlarge]

I don't think there's any fixing this.

[elektro]

Your source is messed up. The chroma of two fields has been blended together -- but not fields from the same frame. And weirdly, the chroma is BFF whereas the luma is TFF.

Thanks for this analysis. Is there any way to at least reduce that annoying issue?

[jagabo]

Reversing the field order of the chroma keeps the chroma closer to the luma and less bouncy:

LWLibavVideoSource("interlaced.mp4", cache=false) 
AssumeFPS(30000,1001)
l = AssumeTFF().SeparateFields()
c = AssumeBFF().SeparateFields()
MergeChroma(l, c)
Weave()
QTGMC()

[elektro]

@jagabo: Thanks a lot. It improves the output.