So all pro's for QTGMC.
I believe what forums say and using it instead of Yadif.
But what are downsides of QTGMC in short?
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Last edited by taigi; 2nd Jun 2021 at 01:29.
The downside s that it is much slower
QTGMC is not a deinterlacer, it's a script, that actually uses Yadif for deinterlacing when you choose the ultrafast or superfast presets.
Choosing high presets - up to Placebo.
One drawback is it tends to denoise or smooth over fine details . It's the reason for it's precursor's existence - calming bob flicker, reducing aliasing . Sometimes that's considered a "pro", sometimes a "con" in some situations
Other than slow, it requires many prerequisite functions and plugins
It looks like I noticed extensive smoothing.
What could be the way to lose less of fine details?
Read the detailed instructions, especially the source match, noise bypass, GrainRestore, NoiseRestore sections .
In general, higher temporal radius (TR0,TR1,TR2) settings, means more smoothing thus more loss of detail
There is a lossless mode which retains the original fields, but then you get more flicker, shimmer, combing and less smoothing.
There are many settings you can adjust, all of them are tradeoffs. Preview your results (e.g avspmod), and tweak them.
1. Using it when it's not called for (double-rate deinterlacing when an IVTC is called for, for example).
2. Slow (I usually use a much faster and nearly as good bobber).
3. Using it mostly for its cleaning properties (I prefer using dedicated filters for cleaning).
User error, mostly. Lots of options.
I've come across situations where any QTGMC setting would cause weird motion issues.
See this: https://forum.videohelp.com/threads/398713-QTGMC-image-vibration-motion
By contrast, people like me, and you, and most of the members of this forum who all care about this stuff, own decent TV sets that have excellent deinterlacing built in which, as you point out, do much the same thing as QTGMC, In fact, they probably do it better because they have direct access to the pixels on the screen.