QTGMC made a logo flicker

[elektro]

Using QTGMC generates an annoying flicker on a static logo (at "10 Edicao") which already looks ok even in interlaced form. Is there any way to "tell" QTGMC to ignore a certain x1, y1, x2, y2 area with the logo? How to make that top right logo stay static?

[VoodooFX]

Make a mask of the logo then use it to overlay the logo back from the original video.

[Selur]

There is no 'ignore region' option for QTGMC.
What should a deinterlacer do with the separate fields when it should ignore a region?
You could try BWDIF instead of or in combination with QTGMC. (or some field matcher, in case the source isn't interlaced to start with)
Got a sample of the source? (the provided clip seems progressive)
What does your script look like?

[Sharc]

... (the provided clip seems progressive) ...

It is true interlaced 29.97i, 59.94 fields per second, TFF

[Selur]

Strange, must be due to some scaling on my laptop.

[Selur]

Ah, the progressive logo was added on the fields. BWDIF or TDeint are better than QTGMC for such sources.

[Sharc]

Yes, try something like this:

assumeTFF()
TDeint(mode=1,tryweave=true)
QTGMC(inputType=1)

[elektro]

Yes, try something like this:

assumeTFF()
TDeint(mode=1,tryweave=true)
QTGMC(inputType=1)

Thanks. But I don't care about the logo itself (just the flicker to be gone), the priority is the main image to look as good as possible. Perhaps those tiny horizontal lines from the logo's yellow ribbon trick QTGMC to treat them as combing artifacts. I'll use logo masking suggested by VoodooFX.

Anyway, good to know. I added that code to my Avisynth templates (I keep a collection of useful snippets for various scenarios).

Edit: I finally managed to get good results with logo masking. That's the script I used:

SetFilterMTMode("QTGMC", 2)
LWLibavVideoSource("sample.mkv")
AssumeTFF()
AssumeFPS(29.970)
QTGMC(Preset="Slow", FPSDivisor=1, MatchPreset="Slow", Sharpness=0.5, TR2=3)
maskclip = ColorKeyMask(FFmpegSource2("logomask.png"), $ff0000, 60)
Overlay(FFmpegSource2("logo.png"), mask=maskclip.ShowAlpha, mode="blend", opacity=1, x=1554, y=116, output="YV12")
Prefetch(4)

I managed to find the logo in good quality and for the mask I painted red the areas where I wanted transparency.

[Sharc]

Something like this:

clip_base=ffms2("sample.mkv")  #your video
clip_base=clip_base.AssumeTFF().QTGMC() #deinterlace
clip_overlay=ImageSource("logo.png")  #your logo snippet
overlay(clip_base,clip_overlay,x=1739,y=114)  #adjust x and y to fit the position exactly

You could use a graphic tool ("magic wand") to cut a more precise part out of the logo for the overlay.
Or you could try with Avisynth's masktools.

[elektro]

Something like this:

clip_base=ffms2("sample.mkv")  #your video
clip_base=clip_base.AssumeTFF().QTGMC() #deinterlace
clip_overlay=ImageSource("logo.png")  #your logo snippet
overlay(clip_base,clip_overlay,x=1739,y=114)  #adjust x and y to fit the position exactly

You could use a graphic tool ("magic wand") to cut a more precise part out of the logo for the overlay.
Or you could try with Avisynth's masktools.

Thanks. After some trial and error I managed to find a solution (see the previous post). In your code snippet, is it not required to paint the areas for transparency and use the existing transparency channel from PNG?

[VoodooFX]

I read about the Overlay function but it's confusing

Use it like that:

original_video = LWLibAvVideoSource("D:\sample.mkv")
processed_video = original_video # pseudo code, insert your own, like QTGMC 

mask=ImageSource("D:\xxx.bmp").ConvertToY8.Trim(0,-1)

Overlay(processed_video, original_video, mask=mask)

How to make a logo mask out of this logo fragment?

Use Photoshop or similar.

You can use InpaintDelogo to get a mask, for example:

InpaintDelogo(Loc="1540,100,-70,-876", mask="d:\xxx.bmp", Automask=1, Analyze=3)

It should be used on your full video, after deinterlace. Here what I got from your sample (no idea if it's good):

[Sharc]

In your code snippet, is it not required to paint the areas for transparency and use the existing transparency channel from PNG?

It was a simple 'overlay' example only for demo. Glad you found your way.