8mm Forum: AVISynth script for lowering FPS

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Topic: AVISynth script for lowering FPS

Bill Vendasi
Film Handler

Posts: 45
From: Dover, NH, USA
Registered: Apr 2015

posted November 21, 2015 09:03 AM

Hi all,

I just started working with AVISynth and I'm using this script to
lower the frame rate of some very old 8mm films.

Import("C:\Program Files\Avisynth\plugins\sRestore.avs")
AVISource("COMPLETE.avi")
ConvertToYV12(interlaced=true)
QTGMC(Preset="faster")
Srestore(Frate=19.98)
AssumeFPS(12)
Crop(8,0,-8,0)
LanczosResize(640,480)

I had to run the projector very fast to avoid flicker, which worked ok but the result was almost Keystone Cops speed. After trying 20, 18, 16, & 14 FPS, the above script brought the speed to what looks normal to me.

But as you probably know, 12 FPS looks kind of jerky and duplicate frames play a big role in this effort as well.

If anyone has any suggestions or better scripts to do this I'd love to try them.

I wanted to post a small example clip but I'm not sure how to do it here.

Thanks,
Bill

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Bill Vendasi
Film Handler

Posts: 45
From: Dover, NH, USA
Registered: Apr 2015

posted November 23, 2015 07:11 AM

and maybe somebody could post a good recipe for Chicken Florentine.

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Lee Mannering
Film God

Posts: 3216
From: The Projection Box
Registered: Nov 2006

posted November 23, 2015 07:32 AM

You will need
2 spoons olive oil
200g spinach
1 garlic clove
126g mozzarella cheese
720ml tomato pasta sauce
2 teaspoons sugar
half cup Basil leaves
Quarter cup plain flour
Roasted small potatoes and some Broccoli
Don't forget 4 chicken breasts.

Alternatively you can plug in a Super 8mm cine projector and really enjoy watching some films, the better option!
[Cool]

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Janice Glesser
Film Goddess

Posts: 3468
From: Sunnyvale, CA USA
Registered: Sep 2011

posted November 23, 2015 01:26 PM

Hi Bill... A lot depends on what the original fps the film was shot at and what fps your camera captured. If these were home movies most likely it was shot at 18fps. Your camcorder should be set to 60 or 30fps and the projector speed around 20fps. This should reduce or eliminate any flicker.

If you just want to slow the captured image down you can do this directly in Virtual Dub without removing any duplicate frames. However, I use a "No-Dups" AVISYNTH script that uses DGbob & FDecimate plugins to remove duplicate frames and set the FPS. You'll have to determine your own parameters.

LoadPlugin("DGbob.dll")
LoadPlugin("FDecimate.dll")

DirectShowSource("your filname here.avi")
ConvertToYUY2()

# Convert to fields and shifting every other field by half a line:
DGBob(order=0,thresh=12)

# Remove duplicate frames:
# In the last line, you need to fine tune the resulting frame rate (currently 16.0). Fractional numbers are allowed.
# In the ideal case, you should see no duplicate frames and no skipped frames.
FDecimate(rate=16.6667, threshold=3)

--------------------
Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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