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Old 28th September 2005, 14:10   #1  |  Link
mg262
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Average plug-in : weighted average of any number of clips; fast (500 FPS on 2 clips)

Average, 21 October 2005

Usage is

Average(clip, weight, clip, weight, clip, weight, ... ) #YV12 clips

For example, a simple average of clips alpha and beta is given by

Average(alpha, 0.5, beta, 0.5)

And for three clips

Average(alpha, 1.0/3, beta, 1.0/3, gamma, 1.0/3)

In action:


It uses (unoptimised) iSSE if present and otherwise falls back to C. On 720x576 source, the iSSE implementation runs at 500 FPS (2 clips), 270 FPS (4 clips) and 190 FPS (6 clips) on my Pentium 4/2400. (Measured, of course, by AVSTimer.)

It is probably best to make sure the weights sum to one; the plug-in will work fine if they don't but the average may not make sense. Audio is always taken from the first clip.

This can be used as a temporal average by using arguments like:

Alpha.trim(1, 0) #next
Alpha
Alpha.trim(0, -1) + Alpha #previous


With a little script work, this can be combined with the scene detection built into Cel Background to avoid averaging over scene boundaries; I'll explain how if one of the scripters out there is interested.

This release was brought to you by the Association for the Prevention of Cruelty to TemporalSoften.

Edit: iSSE added -- read next posts.

Last edited by mg262; 21st October 2005 at 18:09.
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Old 28th September 2005, 14:57   #2  |  Link
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Hah!

Idea and realisation:

No speed rush for non-64bit Athlons:


Quote:
Originally Posted by mg262
This can be used as a temporal average ...

[...]

With a little script work, this can be combined [...] to avoid averaging over scene boundaries
... and probably some other tasks
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Last edited by Didée; 28th September 2005 at 15:06.
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Old 28th September 2005, 15:43   #3  |  Link
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Why, Didée, you know I can't bear to see you unhappy

Since it was unoptimised assembly it was pretty straightforward to change to iSSE -- and for reasons I don't follow it is also four times faster. (Not that I'm complaining! I will analyse it when I have more time.) I assume Athlons can cope with this? In any case, please let me know if it doesn't seem to be working. Also, change for MMX would be pretty straightforward if needed.

Now a request for you, Didée: please consider making a filter wish list, for anything you want but especially for simple operations like this one...


Edit: the reason it was four times faster was as follows:

DVDepisode("1")#.crop(8, 2, -12, -2)average(last,1.0/6,Trim(1,0),1.0/6,Trim(2,0),1.0/6,Trim(3,0),1.0/6,Trim(4,0),1.0/6,Trim(5,0),1.0/6)
reduceby2()
o= last

a=o.Trim(3650, 3650+100)
b= o.Trim(4392, 4527) #Bridge
c=o.Trim(700, 800) #
s4(a.Subtitle("A"),b.Subtitle("B"),c.Subtitle("C"),Average(a, 0.2,b,0.4,c,0.4).Subtitle("Average(A,0.2, B,0.4, C,0.4)"))
#reduceby2()

#Average(a, 0.2,b,0.4,c,0.4)
#
o
AvsTimer(frames=1000, name="mpeg2dec", quiet=true)
#average(last,1.0/6,Trim(1,0),1.0/6,Trim(2,0),1.0/6,Trim(3,0),1.0/6,Trim(4,0),1.0/6,Trim(5,0),1.0/6)
#average(last,0.5,Trim(1,0), 0.5)
average(last,1.0/4,Trim(1,0),1.0/4,Trim(2,0),1.0/4,Trim(3,0),1.0/4)
AvsTimer(frames=1000, name="average", difference=1)



Last edited by mg262; 28th September 2005 at 15:46.
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Old 28th September 2005, 17:26   #4  |  Link
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Thank you. Oh, and a nice method to squeeze 400% speed increase, indeed. Could work for other filters, too.

Okay, I consider. Problem is, when you shall think of something, then usually nothings comes into mind ...

BTW, above link starts with "http://http://..." - that's probably not correct.
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Old 28th September 2005, 18:08   #5  |  Link
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Oops -- link fixed. Thank you.

Don't worry about compiling something right away! Just as/if things occur to you while you are playing with scripts.

Edit: the " test for relevant instruction set" may still reporting an error as "sse2 not present"... but it's just that I forgot to change the other message; it really is testing for integer sse. Will fix in next version.

Last edited by mg262; 28th September 2005 at 18:10.
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Old 29th September 2005, 06:54   #6  |  Link
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hey, cool. just 2 days ago i was trying to average 3 clips together to get one uber-clip... i was using ye olde interleave(1,2,3).temporalsoften(1,255,255).selectevery(3,1) to do it.

i like your method better
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Old 29th September 2005, 10:59   #7  |  Link
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Quote:
average 3 clips together to get one uber-clip... i was using ye olde interleave(1,2,3).temporalsoften(1,255,255).selectevery(3,1) to do it.
Doesn't the scene detection mess that up?

@Mug Funky + @Didée (plus anyone else who feels like chipping in),
Do you have preferred methods of scene detection?
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Old 29th September 2005, 11:25   #8  |  Link
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not really... i set that to 255 as well. so long as you're selectevery-ing the correct frame, there's no bleeding between frames.

as far as preferred scene detection methods go... haven't really needed it, as filters that require it (MVtools stuff) tend to be too slow to use practically anyway.
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Old 29th September 2005, 14:13   #9  |  Link
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Right. Suppose you're taking a temporal average, radius two, like this:

A|B C D E

with a scene break between A and B.

Is it all right to take the five-point average

B B C D E

Or do you think it's necessary to take the four-point average

B C D E

? (The former is straightforward with the scene detection I have, I guess it's straightforward with ConditionalFilter as well, whereas the latter is possible but more fiddly and harder to generalised higher numbers.)
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Old 21st October 2005, 17:24   #10  |  Link
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I used your Average filter that way:
Code:
Average(source.duplicateframe(0), -0.5, source, 1.0, source.trim(1,0), 1.0, source.trim(2,0), -0.5)
Now, with the avisynth 2.56 final it runs stable on my Pc, but I get a green stripe on the right side, see attachment. Do I something wrong?

I made some more test and I have still stability problems with the new avisynth version. I have a athlon XP 2000+ and a simple 256mp DDR.
I get this message when I use it in the function (have also problems with stand alone):
Evaluate: System exception - Access Violation
Attached Images
 

Last edited by MOmonster; 21st October 2005 at 17:45.
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Old 21st October 2005, 18:08   #11  |  Link
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Quote:
Do I something wrong?
No, I did! When I switched from sse2 to isse, the code changed to process four pixels at a time rather than eight... but there was a stray 8 sitting in the code that I didn't catch. (As it happens, that would have caused an access violation under some circumstances too...) As usual, problem caused by copy/paste... thank you for spotting it. Fixed version above... please let me know what the results of using it are.
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Old 21st October 2005, 18:58   #12  |  Link
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@mg262
Thanks, now everything is running fine.
Really nice fast filter.
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Old 22nd October 2005, 04:23   #13  |  Link
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Hey, I was wondering where all those Access Violations/crashes were coming from, I thought they were something I was doing wrong. I'll pick up this new version right away and start testing!
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Old 22nd October 2005, 04:58   #14  |  Link
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Sorry about that!
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Old 24th October 2005, 00:16   #15  |  Link
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humbly request

Hi,

I've used this filter (flawessly, by the way) and i love the possibilty of merge any number of clips i need. Moreover, i think it could be extended, to another colourspaces, and another modes of merge (calculation of median, instead of avegerage). Maybe will be necessary to use another name for the hipotetic new filters, but the central idea will be the same.
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Old 24th October 2005, 07:32   #16  |  Link
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median is a great idea! that'd sort out stuff like overlaying multiple captures. would also be good for mocomped interleaving and stuff.
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Old 24th October 2005, 08:10   #17  |  Link
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More colour spaces should be quick. Median is possible but will be slow compared to the (assembly optimised) average -- unless you only want it for three clips?
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Old 24th October 2005, 08:16   #18  |  Link
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Average, 24 October 2005

Should cope with any colourspace.
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Old 24th October 2005, 08:41   #19  |  Link
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hmm. good point about the assembly and median stuff. i guess for median filtering weights would behave counter-intuitively, and it would be better handled with interleave(1,2,3).clense().selectevery(3,1)

[edit]

btw, thanks for the quick update
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Old 24th October 2005, 11:12   #20  |  Link
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If it's for a small, fixed, number, I think I might have a way of doing it reasonably fast in assembly. But I don't understand how you would even put weights in for median filtering? Unless you wanted to take the weighted average of minimum, median, and maximum (for 3 clips).
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