Virtualdeub - decimate 8mm footage

[LSchafroth]

I have catpured some 8mm film with my MiniDV camera and a 1/60th shutter speed.

I was reading the documentation in the Spot Remover filter and it says to use a decimate filter to remove the duplicate frames from this type of capture. Does anyone have a clue how to do it?

I'm still confused about it and what to do. I see the Frame Rate menu item in Virtualdub. Is this where I do it and if so, how do I determine what settings to change?

Thanks!

LS

[LSchafroth]

Hello?

[manono]

Hi-

An hour and 14 minutes later it gets a bump?

Anyway, do you know the original framerate? What, maybe 16fps or so? Maybe 18fps? You're going to have to know it in order to decimate by the correct amount. Otherwise it'll be just trial and error. In addition, you captured it with your interlaced DV camera, right?

So, first I would suggest opening it in VDubMod, finding a place where there's movement, and then advancing a frame at a time. If you see combing/interlacing, then I wouldn't do it in VDubMod. I'd do it using AviSynth. But let's assume it's whole frames you see, although I don't see how it could be. Then tick the Convert to fps box inside Video->Frame Rate and set a framerate. Save under a different name, after making sure that both Audio and Video are set for Direct Stream Copy. No reencoding will be done. In the off chance it's 24fps, you can try ticking Inverse Telecine->reconstruct from fields-adaptive. I don't believe that 8mm is 24fps, but it's worth a try. You can check afterwards for dupe frames. I'm not entirely sure of myself here, as I do this kind of thing with AviSynth. You can't hurt anything, though, as you'll get a new file out of it, leaving the original untouched.

I don't really think that will work, so, using AviSynth, after loading the Decomb.dll, for 18fps:

Telecide(Order=1) #or Order=0 if bottom field first
Decimate(3).Decimate(10)

and for 16fps:

Telecide(Order=1) #or Order=0 if bottom field first
Decimate(3).Decimate(5)

For other framerates, jiggle the Decimates. You can step through the resulting file to see that the duplicate frames are gone, and you're not dropping any unique frames unnecessarily.

[LSchafroth]

Actually it was two days later it got bumped.

LS

[LSchafroth]

Anyway, do you know the original framerate? What, maybe 16fps or so? Maybe 18fps? You're going to have to know it in order to decimate by the correct amount. Otherwise it'll be just trial and error. In addition, you captured it with your interlaced DV camera, right?

I'm not sure what the original frame rate of the projector is. Not sure how to find out. I do see some jaggies when stepping from one frame to the next with VirtualDubMod. It makes it hard to tell what is a dup frame and what's not. I will give the change to fps in VDMod and will also try the AVSynth stuff and see what results I get.

Thanks for the detailed response...much appreciated.

LS

[manono]

Hi-

Actually it was two days later it got bumped.

That was pretty stupid of me, wasn't it? My apologies.

OK, if by jaggies you mean interlacing or combing, then I don't think that you can change the FPS in VDubMod. AviSynth and Decomb might be a better way to go. Assuming it's 29.97fps (File->File Information will confirm that), first use:

Telecide(Order=1) #or Order=0 if bottom field first

Then step through the frames in VDubMod, and you should see whole frames, some unique, and some duplicates. I hope that the capture didn't introduce blended fields into the video. If so, you might be screwed. If you have nice clean frames, then count how many dupes you get in every 30 frames, subtract from 30, and that will give you the original framerate. Then some combination of Decimates appplied after Telecide should be able to get you back to the original framerate.

[jimmalenko]

You can change the frame rate or decimate in vdubmod by going to Video > Frame Rate:

[LSchafroth]

I set VirtualDub to display progressive frames. I stepped through the video and I get the following pattern.

4 different frames, 1 dup, 4 dif, 1 dup and so on.

How would I decimate this or simply remove the duplicate frame from this file. I thought I could do a decimate by 5 and it removed the dup frames but now the file is 5.9fps!!

Thanks!

LS