Use dupe frames to help denoise 720p like, different, advantage, something

andy

I have some 720p material here that is AABBBAABBBAA which is film with duplicate frames to make 60 fps.  I've noticed the noise is different between duplicate frames.

How can I denoise this material using the duplicate frames to my advantage before throwing them away?

use temporalsoften with a very very low scenechange threshold (i wish this was a float value, as sometimes quot;1quot; is too high).

something like:

temporalsoften(1,32,32,1)

there's much cleverer ways to do it, but they're slow and i can't be bothered scripting one just now

dup(threshold=.4,chroma=false,maxcopies=3,copy=true,blend=true)

Play with threshold depending on how much noise there is, and maxcopies if you have longer sections. This will blend every run of dup-ish frames into a run of perfect duplicates.

That didn't really help much.  I'm uploading an example file to help with choosing the deniose script.  I've been playing with some filters but havn't gotten anywhere.

I remember long ago someone on the forum was capturing a source twice and using both captures to create a cleaner capture.  I think the principle is the same here.

I found this which could be helpful with getting rid of the ugly scenechanges.
showthread.php?t=78338

example file: files/wotw.zip

well, if there's any difference between the dupes on a 720p encode, they can't be analog noise.  this means they're mpeg artefacts... averaging them can help, but it's also likely to bugger things up - it'll average bad frames with good.

we need some quick metric for detecting if a frame is quot;blockyquot; or not.  or perhaps frames could be de-blocked then averaged?

i used cpu=4 in the mpegdecoder and tried using UnDot().FFT3DFilter(Sigma=3,BW=16,BH=16).Deen(quot;c3dquot;,1,3,3,25) after droping the duplicate frames.  It helped a little bit but I think i need break out the dvd as I think it has less noise.  However, the DVD has some very sad quality for a newer release movie.

Very common on some 720P material.  For the sake of time, I'll usually do a SelectEven and/or SelectOdd, scrub through see if one looks better.

I posted a similar question back last summer.  A kind soul had a function that helped; my impatience ultimately led me to use the option above.

I dropped the FFT3DFilter as it was adding way too much ringing.  As for the dropping of the duplicate frames I used selectevery(5,2,4) which is working pretty well.  It seems to avoid the ugly scene change frames because it has a whole duplicate frame to catch up.

Whoops.  Just took a look at your source file.  Forget what I wrote, I didn't realize the extent of your blocking.  That's bad enough just to consider getting the standard def version of that movie.

i already own the dvd, however i had one look at it and wish I could have got my money back.  alas, it has very poor video quality.  overall, if I can avoid those rare ugly scenechange frames, this version is better than my dvd.

So if you wanted to convert this AABBBAABBBAA material back to 24 fps how exactly would one do it? I have a similar source and Im not sure how to convert it back to 24 fps.

Thanks,
wheel

For AABBAABBAA..., decimate(mode=2) or tdecimate(mode=1).

For ABABA..., tdecimate(mode=1,cycleR=3).

The pattern is AABBBAABBB, not AABBAABB nor ABABA, ect.

I meant what you want to end up with, starting from AABBBAA..., sorry about that.

what about throwing in TTempSmooth?