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need help about deinterlacing video - Printable Version

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need help about deinterlacing video - jono - 24.08.2022

source video is 1920x1080 29.970 fps MBAFF Top Field First. and i didnot see any strange motion.



i want to encode to 720p progressive 23.976.
with tivtc the result is some frame missing and the credit text has aliasing.

with qtgmc bob + srestore default setting in hybrid and set frame to 23.976 the result is some frame missing and the credit text has aliasing.

RE: need help about deinterlacing video - Selur - 24.08.2022

-> try another source filter
if you want further help, share more details and read the sticky

Cu Selur

RE: need help about deinterlacing video - jono - 25.08.2022

(24.08.2022, 21:03)Selur Wrote: -> try another source filter
if you want further help, share more details and read the sticky

Cu Selur
media info source video
ID                          : 4113 (0x1011)
Menu ID                     : 1 (0x1)
Format                      : AVC
Format/Info                 : Advanced Video Codec
Format profile              : High@L4.1
Format settings, CABAC      : Yes
Format settings, ReFrames   : 4 frames
Codec ID                    : 27
Duration                    : 1mn 38s
Bit rate mode               : Variable
Bit rate                    : 34.3 Mbps
Maximum bit rate            : 38.0 Mbps
Width                       : 1 920 pixels
Height                      : 1 080 pixels
Display aspect ratio        : 16:9
Frame rate                  : 29.970 fps
Color space                 : YUV
Chroma subsampling          : 4:2:0
Bit depth                   : 8 bits
Scan type                   : MBAFF
Scan order                  : Top Field First
Bits/(Pixel*Frame)          : 0.552
Stream size                 : 403 MiB (92%)

credit text in source video
[Image: zm2ts-so.png]


the result encode with tivtc or qtgmc bob + srestore frame 23.976, the text become weird.

[Image: zsp1-b.png]

[Image: zsp1-a.png]

RE: need help about deinterlacing video - Selur - 25.08.2022

Sadly you did not read the sticky ([INFO] Infos needed to fix&reproduce bugs,..) or simply ignored it.
The amount of information you share isn't really helping.
Huh No clue what you are doing.
No clue, what the issue is with the text.
Aliasing seems to me roughly the same.

Cu Selur

RE: need help about deinterlacing video - jono - 25.08.2022

(25.08.2022, 04:55)Selur Wrote: Sadly you did not read the sticky ([INFO] Infos needed to fix&reproduce bugs,..) or simply ignored it.
The amount of information you share isn't really helping.
Huh No clue what you are doing.
No clue, what the issue is with the text.
Aliasing seems to me roughly the same.

Cu Selur

source video
[Image: zm2ts-so.png]

encoded video with qtgmc bob + srestore 23.976

[Image: ss2.png]


debug file : https://www.file.io/ybLU/download/qCH9wGqCnR9p

RE: need help about deinterlacing video - Selur - 25.08.2022

a. Does it make a difference if you set QTGMC preset to 'Custom' and change the 'Lossless' value?
b. Is this effect already visible in the Vapoursynth Preview or just after the encogin?

RE: need help about deinterlacing video - jono - 25.08.2022

(25.08.2022, 07:16)Selur Wrote: a. Does it make a difference if you set QTGMC preset to 'Custom' and change the 'Lossless' value?
b. Is this effect already visible in the Vapoursynth Preview or just after the encogin?

A. Change the loseless value still get the same result with the text become weird.
B. Already visible on vapoursynth preview.

RE: need help about deinterlacing video - Selur - 25.08.2022

Okay, so the issue is with the filtering and not the encoding.
Since your source is a blu-ray it might not be actually interlaced by just encoded with MBAFF to please the standard.
So, if you overwrite the scantype to progressive (this will disable all deinterlace handling), do you:
a. see combing in the Vapoursynth preview? (best check, intro, throuout the clip and the outro)
b. still see the change in the text

Cu Selur

RE: need help about deinterlacing video - jono - 25.08.2022

(25.08.2022, 13:09)Selur Wrote: Okay, so the issue is with the filtering and not the encoding.
Since your source is a blu-ray it might not be actually interlaced by just encoded with MBAFF to please the standard.
So, if you overwrite the scantype to progressive (this will disable all deinterlace handling), do you:
a. see combing in the Vapoursynth preview? (best check, intro, throuout the clip and the outro)
b. still see the change in the text

Cu Selur

a. no combing, the video look smooth
b. no change in the text. it look good

so, the video was encoded on 29.970 fps.


thanks for the reply

RE: need help about deinterlacing video - Selur - 25.08.2022

Okay, so video is progressive, but was basically flagged as interlaced, which explains why deinterlacing causes the issue.
Depending whether there are duplicates in the stream you might still want to use sRestore.

Cu Selur