GenMotion and DePan plugins for global motion compensation

[Fizick]

No, but here is simple fps doubler (from 15 to 30):

data = DePanEstimate()
f1_2 = DePan(data=data, offset=1./2)
Interleave(f1_2,last)

[Chainmax]

How about from 15fps to 23.976? Would something along the lines of:

i=last
data=DePanEstimate(i,range=1,trust=5)
f=DePan(i,data,offset=x)
b=DePan(i,data,offset=-x)
Interleave(f,i,b)
SelectEvery(???)

be ok? If so, what should I substitute x and ??? for?

[Fizick]

Look to fps conversion examples in DePan doc and try understand them.

[Chainmax]

I'm not being lazy, the framerate changes appear out of the blue in the readme, and the only two examples (2-to-3 and 3-to-5) are too different for a common template to be extracted from them. About the only thing I see in common is that both examples create some kind of backward and forward information, but that's it.

[johnmeyer]

Here's some code I used quite awhile ago. Haven't tested it with the latest version. However, it worked when I last used it. Hopefully it will help you fill in the gaps in your knowledge and get you going.

#Slow motion
loadplugin("c:\Program Files\AviSynth 2.5\plugins\depan.dll")
AVISource("E:\Volleyball\Volleyball (Soldedad)\Volleyball (soledad)0022.avi")

converttoYV12()
AssumeBFF()
fps3to5()


function fps3to5(clipYV12)
{
# change FPS from 3 to 5 (or 15 to 25, or 18 to 30 and so on), i.e. with factor=5/3
# uses global motion compensation
# input must be YV12 progressive (or separated fields probably ?)
SeparateFields(clipYV12)
data = DePanEstimate(clipYV12)
t3_5 = DePan(clipYV12, data, offset=-2./5)
t6_5 = DePan(clipYV12, data, offset=1./5).trim(2,0)
t9_5 = DePan(clipYV12, data, offset=-1./5).trim(1,0)
t12_5 = DePan(clipYV12, data, offset=2./5).trim(3,0)
Interleave(clipYV12, t3_5, t6_5, t9_5, t12_5)
SelectEvery(15,0,1,2,3,4)
weave()
}

[Chainmax]

Thanks, but that 3-to-5 example is in DePan's readme, and the only other example (2-to-3) is much too different to extract a general framework from them.

[johnmeyer]

I guess none of know what you want. Yes, this was from the readme, but I actually used it, and this script is what I used. In other words, this is a working script. Isn't that what you wanted?

[Chainmax]

Not exactly, I need a 15-to-23.976 script that doesn't result in the need of resampling/repitching the source audio.

[scharfis_brain]

that won't work with depan.

[Chainmax]

I assume 15-to-29.97 won't workt with DePan either, am I stuck with duping/interpolating frames with ChangeFPS then?

[scharfis_brain]

you may upinterpolate it to 150 fps (15fpsx10) and then use cangefps(29.97).
so the remaining jitter is about 1/150 sec

[Chainmax]

You mean extrapolation to 150fps and then ChangeFPS(23.976), right? And what should I use for the extrapolation?

[scharfis_brain]

it is still interpolation.

modify fps3to5 so that it delivers 1/10th steps to achieve 10x of the input framerate

[krieger2005]

Originally Posted by scharfis_brain

... and then use cangefps(29.97).

Originally Posted by Chainmax

... and then ChangeFPS(23.976), right?

No comment.

[Chainmax]

Originally Posted by scharfis_brain

it is still interpolation.

modify fps3to5 so that it delivers 1/10th steps to achieve 10x of the input framerate

I really have no clue how to do it, 3to5 has 3_5, 6_5, 9_5 and 12_5 but it really isn't clear why 4 steps are made and why the first numbers of each step are multiples of 3. I also don't understand the logic behind the offsets on each step or the SelectEvery line.


[edit]If the final conversion is going to be to 23.976, would it benefitial to do the up-interpolation to 120fps instead?

[scharfis_brain]

the more up-interpolation, the less the remaining jerkyness due to the 1000/1001 factor.

[Chainmax]

But 119.88 (120) is a multiple of 23.976 (24), whereas 150 is not. Does that not make a difference when the filter tries to calculate which of the up-interpolated frames to discard?

[Alain2]

That's why sharfis is not talking of an exact convertion, he says you'll have remaining jerkiness. With the depan way as I understand from sharfis and the 3to5 script, you can only divide by decimal numbers the gap between 2 frames to introduce the interpolated ones. This is not compatible with 15 to 23.976 (or more precisely 24000/1001, and this is not an decimal number)

Have a look in the avisynth doc to what changefps does... You'll see why with the depan method "the more up-interpolation, the less the remaining jerkyness due to the 1000/1001 factor."

[Chainmax]

I see. So, what would the modified fps3to5 with 1/10th steps to achieve 150fps be?

[Chainmax]

Alain2? scharfis_brain?