video fps changed after filter the video. Why ?

[SB4]

Hello,


I have used the filters below to filter and scale my video but the result is video with 23.976 fps but the original one is 29.970 fps. Is it good to keep the fps 23.976 or i have to keep the original 29.970 fps ?!

AviSource("01.avi")
AssumeTFF()
TFM()
TDecimate()
Deblock()
UnDot()
McTemporalDenoise(settings="MEDIUM")
nnedi3_rpow2(2)
LanczosResize(1024,960)
BilinearResize(1024,768)
aWarpSharp(depth=32)

Best Regards,

[jagabo]

TDecimate()

[SB4]

Thanks jagabo,

Can i reverse TDecimate() filter work with out re-filter the video again ?!

[jagabo]

Can i reverse TDecimate() filter work with out re-filter the video again ?!

No.

Whether you want to leave TDecimate() in or remove it depends on your source. If it's film based you want it to be 23.976 fps, not 29.97. Otherwise you'll have a duplicate frame every 5th frame. Why do you need 29.97 fps?

[SB4]

What i want to do is to scale my original video from 640x480 to 1024x768. After that i will add 2nd sound track from 25 pfs video file to it. This is the main idea.

[jagabo]

Movies aren't shot at 29.97 fps. They're shot at 24 fps. If this is a movie it's probably been screwed up if it's a 29.97 fps AVI. You need to deterimine exactly what you have then decide to handle it. Maybe you can post a short sample here.

[SB4]

It is a anime series and i can't post sample here.

[jagabo]

Post is somewhere else and PM me.

[jagabo]

That video is 29.97 fps but every 5th frame is a duplicate. The best way to handle it is to remove that duplicate frame with TDecimate, leaving 23.976 fps. If you're going to mux it with a PAL audio track you'll probably have to change the frame rate to 25 fps with AssumeFPS. So your script will look like:

AviSource("01.avi")
TDecimate()
AssumeFPS(25)
Deblock()
UnDot()
McTemporalDenoise(settings="MEDIUM")
nnedi3_rpow2(2)
LanczosResize(1024,960)
BilinearResize(1024,768)
aWarpSharp(depth=32)

I haven't addressed other problems with your video -- like bad levels.

[SB4]

Thanks jagabo,

Is it the best way to change the audio sample rate to match the video file or it is fine to change video frame rate ?!

[jagabo]

You can do it either way. I'd change the video frame rate to match the audio length -- since it's just a matter of adding AssumeFPS() to your script. Unless the NTSC and PAL versions of the episode are different (videos are often edited for content in different countries).

[SB4]

Ok, you said every 5th frame is a duplicate. Can you explain in more details. please ?!

[manono]

Ok, you said every 5th frame is a duplicate. Can you explain in more details. please ?!

I'm not jagabo but it's not so hard to explain. It's anime, apparently, so there are lots of duplicate frames anyway. But in places where every frame is supposed to be unique - a slow panning shot, maybe - there are repeated frames making for jerky playing video. This is evidence that the source is really 23.976fps and duplicates should be removed throughout using the method he suggested.

LanczosResize(1024,960)
BilinearResize(1024,768)

Is there any particular reason you're resizing twice? And is the source so bad that it needs deblocking? The Deblock filter is pretty destructive.

[SB4]

Thanks manono,

I used jagabo method tell me in other post and i'm no sure if it good or not for this video source

I'm not sure if i want Deblock or UnDot filters but this script a lot of people recommend it to me so i use it and gave me a very good result. Is it bad something the video don't need it ?! What if i need it after the re-sizing the video ?!

[jagabo]

Try using HQDeRing() instead of UnDot(). Look at resizing in nnedi3_rpow2() only:

nnedi3_rpow2(2, cshift="LanczosResize", fwidth=1024, fheight=768)

[SB4]

Ok, there is two HQDeRing() filters. The first one use MaskTools v1.4.9 and the second one use MaskTools v2. Which one i have to use...?!

[jagabo]

Whichever one works with the version of MaskTools you have.

[SB4]

I have used the one use MaskTools v2. Is there any difference if i used HQDeRing & Deblock filters after or before re-seizing...?!

[jagabo]

Is there any difference if i used HQDeRing & Deblock filters after or before re-seizing...?!

Yes. You should use them before resizing as the location of the blocks and DCT ringing artifacts is dependent on the source video.

[SB4]

Can i ask one more question. please ?!

I want to know What is the mean of Debanding, Deblocking, Dehaloing & Deringing ?!
I need to know if my video need it or not in more details... ?!

[jagabo]

What is the mean of Debanding

Banded:


Not Banded:

Deblocking

8x8 Blocks from over compression (4x enlarged):


Deblocked (4x enlarged):

Dehaloing

A blurry image (4x enlargement):


When a sharpening filter creates overshoots (notice how there's a dark band to the left of the transition, and a light band to the right, a DeHalo filter tries to fix this):


instead of (no sharpen filter does this well):

Deringing

Ringing artifacts (8x enlarged, note the small dots):


After HQDeRing():

[SB4]

Thanks jagabo, I really appreciate your help...

[SB4]

Hello again

I have question. In the image below is it need Deblocking, Deringing or just Denoise filter...?!

[jagabo]

It needs deblocking. It may need deringing -- it's hard to tell from the subject matter. But since you uploaded a JPG image one can't tell how much of the problems are from the JPG compression and how much was in the original video.