Deinterlacing this file with QTGMC or BWDIF gives ugly colour artifacts

[Alwyn]

Doodling, as you do...

@Ad-Astra put up the attached AVI (DV capture using Scenalyzer) for analysis of an audio issue in this post.

I thought I'd have a practice deinterlacing it. I used VDub's Yadif Double framerate BFF and it came out OK (still a few jaggies). So I thought I'd do it properly with QTGMC (also tried BWDIF) and it came out awfully:


[Attachment 88201 - Click to enlarge]

I used just the basic script:

AviSource("H:\Videohelp\Ad Astra\Audio 1 channel.avi")
ConvertToYV12(interlaced=true)
AssumeBFF()
QTGMC(preset="Fast", EdiThreads=8)
Prefetch(24)

It seems as though some of the colours are located half way across the frame.

Any ideas about getting QTGMC to work correctly on this file (I did try Merge Chroma as well but it made no difference)?

[poisondeathray]

Likely your VFW decoder installed for AVISource is not returning the proper chroma for NTSC DV 4:1:1

You can use FFVideoSource / LWLibavVideoSource/ BSVideoSource instead, or use a different VFW decoder

[Sharc]

For the scene acc. to your screenshot there seems to be a problem with the chroma motion which does not advance in step with the luma motion, but only every 2nd frame. Check the motion of the U,V planes versus the Y plane. (I am not very experienced with 4:1:1 DV though).

Edit: pdr was faster

[Alwyn]

LWLibavVideoSource

That fixed it.

I'll have a look at using a different VFW decoder.