Progressive to Interlaced covertion adding combvefect

[samaxI92]

Hello every-one,

I need help to convert some of my 1080p AVC video to 1080i adding comb effect.

Software like MeGUI or AviDeMux doesn't do that for me, they just Interlace without comb effect.
Perhaps they do it, but I don't know how..

Please, please... don't tell me video shouldn't have combing.

So I'm hoping some-one will help me with 1080p to 1080i encoding adding comb effect.


Thanks...

[jagabo]

1080p at what frame rate?

[samaxI92]

1080p at what frame rate?

at 25fps

[poisondeathray]

1080p at what frame rate?

at 25fps

That's not enough to convert it to true interlaced; you need 50fps

Or were you more interested in creating a "fake" combing effect (as a visual effect) , not converting it to truely interlaced ?

[jagabo]

1080p at what frame rate?

at 25fps

To make a true 1080i video (50 different fields per second) you would need a 50p source. You can create a video with interlaced frames (ie. with comb artifacts) by packing fields from adjacent frames together but there will still only be 25 unique pictures per second (motion will not be any smoother). That can be done in AviSynth with:

WhateverSource("filename.ext") # a 25p source
SeparateFields() # convert to 50 fields per second
Trim(1,0) # throw away the first field
Weave() # weave fields back together, now "out of phase"

[manono]

You can create a video with interlaced frames (ie. with comb artifacts) by packing fields from adjacent frames together but there will still only be 25 unique pictures per second

Right, and it's still a lame idea. You need a much higher bitrate for the same quality as progressive (or, put another way, you'll get much lower quality for the same file size), and you're dependent on the player's or TV's deinterlacer which may or may not be any good. As an experiment, maybe; as something thought to be necessary for some misguided reason, definitely not.

[samaxI92]

Thanks guys for answering.. me,,

I like interlaced videos because.. they usually are more detailed than progressive(Though too much comb effect bothers me..) I see.

Of course you noticed, it becomes less detailed when you deinterlace an interlaced source.

What I'm trying to do is(Two things actually):-

1st one: Encode from the source- 1080i, MPEG 2, 4:2:2@High, 25fps, TTF
To
1080i, AVC 4.0@high, 25fps, TTF

2nd one: Encode from the source- 1080p, MPEG 2, 4:2:2@High, 25fps
To
1080i, AVC 4.0@high, 25fps, TTF

See if you could help me...

Thanks everyone..

[poisondeathray]

I like interlaced videos because.. they usually are more detailed than progressive(Though too much comb effect bothers me..) I see.

Maybe there is a language or communication issue?

For the same generation of video, progressive will have 2x the resolution as interlaced, and thus more detail. (interlaced video contains 1/2 the spatial resolution as progressive)

Or were you talking about the "smoothness" of the video ? Temporal resolution ?


There are other factors like compression, bitrate, source quality that affect the visible detail as well (you might be comparing videos with different characteristics and making the wrong conclusions based on whether it was interlaced or progressive)

[manono]

Of course you noticed, it becomes less detailed when you deinterlace an interlaced source.

I suppose that's true to a degree, but I suspect you are using an inferior deinterlacer. It certainly doesn't follow that you gain detail by interlacing a progressive source. As I suspected, your whole premise is completely wrong but maybe make the experiment so you can prove it to yourself

[samaxI92]

[QUOTE=manono;2200537]

I suppose that's true to a degree, but I suspect you are using an inferior deinterlacer. It certainly doesn't follow that you gain detail by interlacing a progressive source.

I wanna add so less comb effect that edges should look a little better. Its like you adding grain to artificially enhancing quality.
Thats it .

[poisondeathray]

I wanna add so less comb effect that edges should look a little better.

I'm confused at what you are asking. Can you describe what you mean by "comb" effect. It has an exact connotation in the video world

Look at the 3rd picture in this post .
http://100fps.com/

Edge enhancement is usually done with sharpening filters, not creating interlace

[samaxI92]

[QUOTE=poisondeathray;2200548]

Can you describe what you mean by "comb" effect. It has an exact connotation in the video world

Look at the 3rd picture in this post .
http://100fps.com/

Edge enhancement is usually done with sharpening filters, not creating interlace

"Comb artifact" is spike effect on the edges OR horizontal lines we see when scene changes fast due to Interlace scanning.

Oh sharpening would screw other things but edges if I can't use it perfectly..!!

[jagabo]

That is the most misguided and ill conceived request I've ever seen here. Why would you want to take a perfectly fine progressive image like this:



and turn it into an interlaced mess like this (one field shifted left by 2 pixels):



Click on the images a few times to see them full size.

[samaxI92]

That is the most misguided and ill conceived request I've ever seen here. Why would you want to take a perfectly fine progressive image like this:

Attachment 14771

and turn it into an interlaced mess like this (one field shifted left by 2 pixels):

Attachment 14772

Click on the images a few times to see them full size.

Wow.. how did you do it?I mean,, was it piece of cake. I wanna learn.

Right.. now see this:


Interlaced


De-Interlaced _Yadif


De-Interlaced _Bob

Hmm.. now see what you choice is. Mine is Interlaced. Beside.. it looks bad when you pause video or have much combing like your 2nd picture.

Ok.. sir,, I've sources like this(Unlike yours) :

[jagabo]

I don't know what you think your images are showing. As was mentioned before: the fact that deinterlacing can't perfectly restore a progressive image doesn't mean that interlacing progressive material increases the detail. It doesn't. It just messes up the picture. Nobody in their right mind would do it. Here's what I did to shift one field to the left by two pixels:

SeparateFields()
evn=SelectEven().Crop(0,0,-2,0).AddBorders(2,0,0,0)
odd=SelectOdd()
Interleave(evn,odd)
Weave()

But I view this a something like teaching you to smash your thumb with a hammer.

[samaxI92]

Here's what I did to shift one field to the left by two pixels:

SeparateFields()
evn=SelectEven().Crop(0,0,-2,0).AddBorders(2,0,0,0)
odd=SelectOdd()
Interleave(evn,odd)
Weave()

But I view this a something like teaching you to smash your thumb with a hammer.

O no.. this is no interlacing(I think you know it very well).
Interlacing is the process of showing(scanning) "odd fields" first and then the "even fields" of entire image; not displacing fields!!!! Its really like you teaching me smashing my thumb with a hammer.

Actually now I realize that I shouldn't ask for combing..
I only need to interlace, real interlace(Not fake interlacing like MeGui's option for h264 encoding).
The horizontal lines should be seen at changes of scene due to Interlace scanning and
its not an effect.

[jagabo]

You can't get true 25 fps interlaced video from a 25 fps progressive source. You're not going to improve the image quality of a 25p source with any kind of interlacing.

You could use motion interpolation techniques to generate in-between frames to generate a 50p video. But that would only smooth motion. It will not otherwise increase the picture quality.

[samaxI92]

You could use motion interpolation techniques to generate in-between frames to generate a 50p video.
But that would only smooth motion.

Thank you so..... much sir for your time and
also for coming this far.

Now.. my last request to you is that you give me a short guide to:
-------------------------------------------------------------------------------------------------------------------------------------------------------------
1. 1080p, 25fps, h264---> 1080p, 50fps, h264 { I'm not familiar with "Motion Interpolation" technique, I think 25fps to 50fps
can be done this way without re-encoding, right.. }

2. 1080p, 50fps, h264---> 1080i, _ _(you tell me whatever fps is required here to make its motion smoother), h264
--------------------------------------------------------------------------------------------------------------------------------------------------------------

If you can give me both ffmpeg and AviSynth script ..will be good for me.

I appreciate your time.

[jagabo]

1. 1080p, 25fps, h264---> 1080p, 50fps, h264 { I'm not familiar with "Motion Interpolation" technique, I think 25fps to 50fps
can be done this way without re-encoding, right.. }

No. New frames have to be generated and inserted into the video. So it has to be reencoded.

2. 1080p, 50fps, h264---> 1080i, _ _(you tell me whatever fps is required here to make its motion smoother), h264

You need to get mv_tools for AviSynth then use a script like:

#discussion: http://forums.guru3d.com/showthread.php?t=288017
#Import("C:\Program Files\AviSynth 2.5\plugins\DoubleFPS2.avs")

function DoubleFPS(clip source)
{
super = MSuper(source, pel=2, hpad=0, vpad=0, rfilter=4)
backward_1 = MAnalyse(super, chroma=false, isb=true, blksize=16, searchparam=3, plevel=0, search=3, badrange=(-24))
forward_1 = MAnalyse(super, chroma=false, isb=false, blksize=16, searchparam=3, plevel=0, search=3, badrange=(-24))
backward_2 = MRecalculate(super, chroma=false, backward_1, blksize=8, searchparam=1, search=3)
forward_2 = MRecalculate(super, chroma=false, forward_1, blksize=8, searchparam=1, search=3)
backward_3 = MRecalculate(super, chroma=false, backward_2, blksize=4, searchparam=0, search=3)
forward_3 = MRecalculate(super, chroma=false, forward_2, blksize=4, searchparam=0, search=3)
MBlockFps(source, super, backward_3, forward_3, num=2*FramerateNumerator(source), den=FramerateDenominator(source), mode=0)
}

WhateverSource()
DoubleFPS()

That will give you 50p from a 25p source. For 50i:

function DoubleFPS(clip source)
{
super = MSuper(source, pel=2, hpad=0, vpad=0, rfilter=4)
backward_1 = MAnalyse(super, chroma=false, isb=true, blksize=16, searchparam=3, plevel=0, search=3, badrange=(-24))
forward_1 = MAnalyse(super, chroma=false, isb=false, blksize=16, searchparam=3, plevel=0, search=3, badrange=(-24))
backward_2 = MRecalculate(super, chroma=false, backward_1, blksize=8, searchparam=1, search=3)
forward_2 = MRecalculate(super, chroma=false, forward_1, blksize=8, searchparam=1, search=3)
backward_3 = MRecalculate(super, chroma=false, backward_2, blksize=4, searchparam=0, search=3)
forward_3 = MRecalculate(super, chroma=false, forward_2, blksize=4, searchparam=0, search=3)
MBlockFps(source, super, backward_3, forward_3, num=2*FramerateNumerator(source), den=FramerateDenominator(source), mode=0)
}

WhateverSource()
DoubleFPS()
AssumeTFF()
SeparateFields()
SelectEvery(4,0,3)
Weave()

Motion interpolation tools work well on some material. But on some material it generates bad artifacts. A bad case example can be seen in this post:

http://forum.videohelp.com/threads/339017-Motion-Interpolation-%28VidFIRE%29-Software?...=1#post2107214

And once again, this will not make your video sharper. It will only smooth motion:

http://forum.videohelp.com/threads/350302-Why-are-25-30p-videos-vibrating-on-all-my-pl...=1#post2196361

[samaxI92]

Thanks jagabo