Best Deinterlacing like QTGMC

[Jay123210599]

I heard QTGMC is the best deinterlacer for videos, but it's very slow. How do I make other deinterlacers like yadif or nnedi have the same quality as QTGMC when I deinterlace videos using them?

Also, which deinterlacer in Shutter Encoder and ffmpeg has the best quality for videos, Yadif, nnedi, or something else? Also, how do I make videos have twice the frame rate when deinterlacing them?

[Attachment 75256 - Click to enlarge]

[davexnet]

bwdif is considered to be pretty good, probably better than yadif

[Jay123210599]

bwdif is considered to be pretty good, probably better than yadif

What about estdif, w3fdif, and detelecine?

[Selur]

Side note: the speed of QTGMC depends a lot of on the used settings, for most cases Preset="Faster" or Preset="Fast" is enough,..

[poisondeathray]

detelecine is for reversing 3:2 telecine. That quality is the best if your source has 3:2 telecine (23.976p content in 29.97i interlaced stream)

estdif and w3dif are not very good in general

But it is source dependent; sometimes a specific deinterlacer will not perform well an a particular source, but good on another

[Jay123210599]

detelecine is for reversing 3:2 telecine. That quality is the best if your source has 3:2 telecine (23.976p content in 29.97i interlaced stream)

estdif and w3dif are not very good in general

But it is source dependent; sometimes a specific deinterlacer will not perform well an a particular source, but good on another

Here is one of information of one of my videos I shall deinterlace.

General
Unique ID : 258353246348045939569265620988127380324 (0xC25D067C7E97E681F2DFF58C715C8364)
Complete name : title00.mkv
Format : Matroska
Format version : Version 2
File size : 5.11 GiB
Duration : 23 min 53 s
Overall bit rate mode : Variable
Overall bit rate : 30.6 Mb/s
Frame rate : 29.970 FPS
Encoded date : 2017-12-12 05:26:37 UTC
Writing application : MakeMKV v1.10.8 win(x64-release)
Writing library : libmakemkv v1.10.8 (1.3.5/1.4.7) win(x64-release)

Video
ID : 1
ID in the original source medium : 4113 (0x1011)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Format settings, picture structure : Frame
Codec ID : V_MPEG4/ISO/AVC
Duration : 23 min 52 s
Bit rate mode : Variable
Bit rate : 28.3 Mb/s
Maximum bit rate : 40.0 Mb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan type, store method : Interleaved fields
Scan order : Top Field First
Bits/(Pixel*Frame) : 0.456
Time code of first frame : 01:00:00:0000000000
Stream size : 4.72 GiB (92%)
Language : English
Default : No
Forced : No
Original source medium : Blu-ray

Audio
ID : 2
ID in the original source medium : 4352 (0x1100)
Format : PCM
Format settings : Little / Signed
Codec ID : A_PCM/INT/LIT
Duration : 23 min 53 s
Bit rate mode : Constant
Bit rate : 2 304 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Frame rate : 30.000 FPS (1600 SPF)
Bit depth : 24 bits
Stream size : 394 MiB (8%)
Title : Stereo
Language : Japanese
Default : Yes
Forced : No
Original source medium : Blu-ray

Menu
00:00:00.000 : en:Chapter 01
00:03:11.891 : en:Chapter 02
00:06:54.046 : en:Chapter 03
00:09:25.665 : en:Chapter 04
00:12:03.956 : en:Chapter 05
00:15:20.519 : en:Chapter 06
00:17:06.158 : en:Chapter 07
00:18:30.542 : en:Chapter 08
00:19:04.009 : en:Chapter 09
00:21:43.201 : en:Chapter 10
00:23:51.997 : en:Chapter 11

Which deinterlace should I use for this type of video? nnedi, estdif, bwdif, or something else?

[poisondeathray]

Mediainfo is not necessarily accurate in terms of actual content - there is no way to tell until you look at it - You have to examine the fields to determine what type of content it is

eg. Progressive "24p" content arranged in fields (encoded interlaced) is telecine.

If you double rate deinterlace, and examine a scene with constant motion, and there is movement every frame, then that scene has interlaced content . If there are 3 duplicates, 2 duplicates, then it's "23.976p" . If there are duplicates, then it's "29.97p" . There are other types of patterns but those are the most common

Animation is almost always progressive content, except for some effects, overlays, credits . You would rarely deinterlace anime or most types of animation, cartoons

In general, if you deinterlace progressive content, you degrade it . In general, for progressive content that is telecined - you should field match and decimate (= inverse telecine) , instead of deinterlacing

[Jay123210599]

Mediainfo is not necessarily accurate in terms of actual content - there is no way to tell until you look at it - You have to examine the fields to determine what type of content it is

eg. Progressive "24p" content arranged in fields (encoded interlaced) is telecine.

If you double rate deinterlace, and examine a scene with constant motion, and there is movement every frame, then that scene has interlaced content . If there are 3 duplicates, 2 duplicates, then it's "23.976p" . If there are duplicates, then it's "29.97p" . There are other types of patterns but those are the most common

Animation is almost always progressive content, except for some effects, overlays, credits . You would rarely deinterlace anime or most types of animation, cartoons

In general, if you deinterlace progressive content, you degrade it . In general, for progressive content that is telecined - you should field match and decimate (= inverse telecine) , instead of deinterlacing

But the video is not progressive, it's interlaced, so what should I do?

[poisondeathray]

If the content is interlaced, then double rate deinterlace it . This should give you 59.94p , with movement every frame . If it doesn't - then you did something wrong, or it's not actually interlaced

QTGMC is probably the "best" overall, but there are some cases where it produces worse results

For the other in your list, bwdif is probably the top choice overall, but sometimes the artifacts are sharper as well - it's a tradeoff

Do some short tests on your source and see what you like better. There is no best at everything

[Jay123210599]

If the content is interlaced, then double rate deinterlace it . This should give you 59.94p , with movement every frame . If it doesn't - then you did something wrong, or it's not actually interlaced

QTGMC is probably the "best" overall, but there are some cases where it produces worse results

For the other in your list, bwdif is probably the top choice overall, but sometimes the artifacts are sharper as well - it's a tradeoff

Do some short tests on your source and see what you like better. There is no best at everything

What are the "some cases" where QTGMC produces worse results? And what about nnedi? How do you deinterlace videos using it in ffmpeg?

[poisondeathray]

What are the "some cases" where QTGMC produces worse results?

It's source dependent. QTMGC can produce "worse" results on some sources , and according to some opinions

It's not all cut and dry either - there are apsects where QTGMC slightly better, aspects where it's slightly worse. It depends on what aspect(s) you consider more important. Don't take anyone's word for it, do some tests yourself and look. Some people hate the detail loss, some people hate that other deinterlacers flicker, some people just hate...

ie. There are pros/cons . QTGMC is still probably the best overall for most sources, at least in terms of temporal consistency and smoothness, fewer aliasing and flicker artifacts. However , the biggest negative of QTGMC is the net effect of denoising and blurring to order achieve that temporal smoothness . You can adjust the many settings to your tastes and for the source to reduce the problems, but there is often texture and detail loss ; that's probably the most common complaint .

Sometimes you can get temporal artifacts, ghosting. The temporal smoothing can sometimes be counterproductive for certain workflows (eg. deblending a field blended source). An non temporal deinterlacer would never get temporal artifacts, but they tend to have more flicker and temporal inconstencies - again a trade off

Default QTGMC settings often make image look like waterpainting (overdenoised and oversharpened). You definitely should adjust settings for each source to get ideal results, and to be fair the oversharpening is mentioned in the instructions. I almost always decrease sharpness right away, unless source is blurry

Sometimes the motion estimation is wrong and you get wobbling areas in parts of frames - it's a related problem with mvtools2 (can also affect mvtools2 based denoisers). This often affects animation scenes where there is low or no motion, hold frames - you get warping artifacts

And what about nnedi? How do you deinterlace videos using it in ffmpeg?

NNEDI3 is intra field only - so it tends to flicker - because there is no temporal component. It can be ok for some sources, bad for others. Again, it's source dependent , like all deinterlacers and filters

The settings for ffmpeg nnedi are in the documentation

https://ffmpeg.org/ffmpeg-filters.html#nnedi


There are published comparisons between deinterlacers, but you should really test them on your source(s) and play with the settings. A lot of it can be personal taste as well.