Dup filter - Remove frames

Support for my Avisynth filters
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TheoRI
Posts: 3
Joined: Mon Jan 09, 2012 10:45 am

Dup filter - Remove frames

Post by TheoRI » Mon Jan 09, 2012 1:11 pm

Dear admin

I am new to avisynth and virtualdub so please pardon my naive question.

My father and I are trying to digitize his super 8 collection.
We have built a projector that uses a CMOS based industrial camera to capture frame by frame the film, at reduced speed, as it rolles.
We are using the directshow driver of the camera and VirtualDub to do the capture

This results in random duplicate frames: ex 11123445

When I load the script in virtualdub and then output the file by "Save as AVI", it still outputs duplicate frames, without dropping the ones your script so well has identified...
# Remove Duplicate frames from super 8 Capture stream
# Using Dub AviSynth plug in
# http://rationalqm.us/dup/dupnew.html
#=============================================================================================

film="E:\TELECINE\input.avi" # source clip, please specify the full path here

# END VARIABLES, BEGIN SCRIPT
#=================================================================================================================================

SetMemoryMax(2000) #set this to 1/3 of the available memory
SetMTMode(5) #disable all MT calls if you are using a single core computer

Avisource(film).converttoYV12()
loadplugin("Dup.dll")

Dup(threshold=10,chroma=true,show=false,copy=false,maxcopies=10,blend=false,debug=true,log="e:\telecine\dup_log.txt")
#================================

The log file looks like this:
Dup: frm 0: Using frm 3
Dup: frm 1: Using frm 3
Dup: frm 2: Using frm 3
Dup: frm 3: Using frm 3
Dup: frm 4: Using frm 4
Dup: frm 5: Using frm 6
Dup: frm 6: Using frm 6
Dup: frm 7: Using frm 8
Dup: frm 8: Using frm 8
Dup: frm 9: Using frm 9
Dup: frm 10: Using frm 11
Dup: frm 11: Using frm 11
Dup: frm 12: Using frm 12
Dup: frm 13: Using frm 14
Dup: frm 14: Using frm 14
Dup: frm 15: Using frm 16
Dup: frm 16: Using frm 16
Dup: frm 17: Using frm 17
Dup: frm 18: Using frm 19
Dup: frm 19: Using frm 19
Dup: frm 20: Using frm 20

I would like the output to only include the unique frames
in this case 3 4 6 8 9 11 12 14 16 17 19 20

Can you please help?
This would be greatly appriecated

Best wishes for the New Year,
Theo

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admin
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Posts: 4393
Joined: Thu Sep 09, 2010 3:08 pm

Re: Dup filter - Remove frames

Post by admin » Mon Jan 09, 2012 9:29 pm

Dup() does not remove frames. It replaces near equal frames with equal frames.

You need decimation. Before I tell you about that I need to know if there is an audio track or is it just video? If there is audio we have to maintain AV sync and our choices will be reduced.

TheoRI
Posts: 3
Joined: Mon Jan 09, 2012 10:45 am

Re: Dup filter - Remove frames

Post by TheoRI » Mon Jan 09, 2012 11:51 pm

There is no Audio involved, just video... decimate away
Theo

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admin
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Joined: Thu Sep 09, 2010 3:08 pm

Re: Dup filter - Remove frames

Post by admin » Tue Jan 10, 2012 9:10 am

Try MultiDecimate to remove all duplicates.

http://rationalqm.us/multidecimate/multidecimate.html

TheoRI
Posts: 3
Joined: Mon Jan 09, 2012 10:45 am

Re: Dup filter - Remove frames

Post by TheoRI » Sat Jan 14, 2012 6:46 pm

Did try it and works great. Thanks!

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admin
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Re: Dup filter - Remove frames

Post by admin » Sat Jan 14, 2012 10:33 pm

You're welcome. You might also have a look at DeDup(). MultiDecimate() is often preferable, however, due to its static scene protection feature.

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