BWDIF for VS

[kolak]

https://ffmpeg.org/ffmpeg-filters.html#toc-bwdif

Fairly new deinterlacing filter in ffmpeg. Good results for given speed. Could we get vs port?

[Jukus]

Is it better than QTGMC?

[kolak]

No, but 10x faster and much better than Yadif itself.
QTGMC even with Very Fast preset is still to slow for some usage.

[Jukus]

I don’t understand why some people complain about the speed of QTGMC, I calmly encode DVDs with Very Slow, while somewhere around 65% of the CPU’s resources go to encoding, not filtering. I can watch dvd in real time with Slower in VS Editor. In doing so, I use a CPU that is almost 10 years old.

[kolak]

Try HD :)
Besides- I don't trip DVDs but use QTMC on 1000s HD masters. Even 72 cores machines don't help.

[Jukus]

I use Fast for BD, 80-90% of the CPU is used for encoding.

[poisondeathray]

Try HD :)
Besides- I don't trip DVDs but use QTMC on 1000s HD masters. Even 72 cores machines don't help.

Did you look at the cuda ktgmc version for avisynth ? If you have fast GPU it could be your answer

[Jukus]

Interestingly, there is a https://handbrake.fr/downloads.php where it is suggested to use Yadif+EEDI2 - it's something incredible :confused:

[Blue_MiSfit]

I use bwdif in ffmpeg and am quite happy with it :)

[kolak]

Did you look at the cuda ktgmc version for avisynth ? If you have fast GPU it could be your answer

I got Tesla K80 old but not that bad.
KTGMC looks interesting, but still sort of beta. I need something 99.9% reliable :)

[kolak]

I probably would just use yadifmod(clip, order=1, mode=1, edeint=nnedi3(clip, field=3, nns=0)) for a quick and dirty deinterlacing.

It has to be fairly decent, not dirty :)
QTGMC (Very Fast) or BWDIF quality.
It runs over script which detects progressive parts and these are passed through. QTGMC is good as even if there is some false detection it doesn't look that different than next original frame.

Any suggestion? Tried other filters but somehow QTMC performs the best, but it's relatively slow. Any way to speed up Very Fast preset?

[Cary Knoop]

I don't see much of a point using QTGMC if you use the 'very fast' preset.

Some people want to eat the cake and have it. but you can't!

Doing a good deinterlacing cost computer time.

[kolak]

This is the point- it's still relatively good compared to other filters.

[Jukus]

I don't see much of a point using QTGMC if you use the 'very fast' preset.

Some people want to eat the cake and have it. but you can't!

Doing a good deinterlacing cost computer time.
I completely agree, in the worst case, can use Faster for a new high-quality BD and Slower for dvd, otherwise it makes no sense, can use any one-button converter.

[kolak]

It's used in totally different workflows than ripping BDs/DVDs. Very different world. There are sometimes 100s files a day. No time for any tweaking- you do it at some acceptable quality. If quality is not good enough client will reject.
It still makes perfect sense as other methods leave more deinterlacing 'signs'. I do use yadifmod in some cases (less demanding clients).

[Sharc]

https://ffmpeg.org/ffmpeg-filters.html#toc-bwdif

Fairly new deinterlacing filter in ffmpeg. Good results for given speed. Could we get vs port?
https://github.com/HomeOfVapourSynthEvolution/VapourSynth-Bwdif

[kolak]

:thanks:a lot!

Lets try it :)

[Cary Knoop]

Not impressed at all with this bwdif deinterlacer, QTGMC makes spaghetti out of it!

[kolak]

It's for speed, not quality :)
What is the difference in speed against QTGMC?

[richardpl]

What is QTGMC actually? NNEDI3 or EEDI3 or EEDI2 or something completely else?

[Jukus]

What is QTGMC actually? NNEDI3 or EEDI3 or EEDI2 or something completely else?
QTGMC is a whole complex of filters (noise reduction, anti-aliasing and others).
The default is NNEDI3, but can choose another plugin.

[LoRd_MuldeR]

QTGM evolved from TempGaussMC (http://avisynth.nl/index.php/TempGaussMC), originally created by Didée. It is "a motion-compensated bob deinterlacer, based on temporal gaussian blurring".

It is a highly complex Avisynth script, using all sorts of plug-ins. Most notably but not limited to MVTools2 (motion compensation), MaskTools v2 (masking), NNEDI3 (interpolation) as well as RemoveGrain (denoising).

The core algorithm is this:
Bob the source clip. Temporally smooth the bob to remove shimmer then analyse its motion
More accurately interpolate the source clip (e.g. NNEDI3). Use the motion analysis from previous step to temporally smooth this interpolate with motion compensation. This removes shimmer whilst retaining detail. Resharpen the result to counteract any blurring
A final light temporal smooth to clean the result
Stages 0 & 1 use a binomial smooth (similar to a Gaussian) to remove deinterlacing shimmer. Stage 2 uses a simple linear smoothing.


NNEDI/2/3 and EEDI2/3 "only" are interpolators.

Simply put, they take an image with only half the lines (one field) and interpolate the missing lines. That alone would not make good deinterlacer, but it is an important "ingredient" for implementing stuff like QTGMC.

(Well, I think NEEDI3 alone would make a decent half-rate deinterlacer, but you do not want to use "pure" NEEDI3 for bobbing)

[kolak]

BWDIF is "based on yadif with the use of w3fdif and cubic interpolation algorithms".
Could we replace w3fdif/cubic part for nnedi3 (or this filter described below) to have less jagged lines?
There is also very new deinterlacing filter in ffmpeg called estdif which is based on "Edge Slope+Tracing Deinterlacing Filter".
It seems to be some new approach and results are quite good, but can still produces jagged lines for static parts of image (this is where yadif is good). For actual combing removal it works very well- smooth diagonals and speed is not crazy bad.

Actually yadif could be bumped to yadifmod and then new interpolation filter. Could be best speed vs quality filter out there.

[Selur]

using:
clip = core.bwdif.Bwdif(clip, field=3)
on the source from https://forum.videohelp.com/threads/418101-QTGMC-made-a-logo-flicker
the first two frames are not deinterlaced.
Am I missing something?

[PatchWorKs]

...pretty old 3ad, anyway for those who're looking for performances, there's also HW-deinterlacing (in QSV (https://github.com/rigaya/QSVEnc#readme)/NV (https://github.com/rigaya/NVEnc#readme)-Encs for example) nowdays...