Re: [Avid-L2] OT: Is there a way to remove duplicate frames in After Effect or Avid using Motion editor for 2:2:2:4 Footage?

On 25 Apr 2023, at 04:29, John Moore <bigfish@pacbell.net> wrote:

I've got some 30 Frame progressive footage that is 2:2:2:4 cadence.

If it's P, that should be 1:1:1:2

  I transcoded to DNxHR HQX in a 30P Avid project.  I'm cutting the footage into a 23.976 UHD timeline and then using the motion adapter promoted to set it to 100%

First, this ancient technology. (Be happy, now it's easy to remove the pulldown.)

But if this is the case, are you sure the cadence is not broken? (In that case you should break it up in separate shots, Resolve has very good scene detection  nowadays.)

I'd really like to just take the original file and remove the duplicate progressive frame that happens every 5th frame.  Any suggestions?

The duplicate happens every 4th frame of the SOURCE. So if you remove the pulldown, a frame is cut after 4 frames of what is in your timeline.

FFmpeg can do this, it's very easy, the most quick and dirty way of going from 30 to 24 is just to cut out frames. 

BUT, Avid does it quick and dirty also. Only problem is, you need to start on the 'right' frame. Cutting out a frame in the timeline does NOT affect the start of the pulldown remove.

So the first duplicate frame should be the fifth frame. 

And, it ONLY works if the math is allright. Going from 30 to 23,976 will get out of the cadence quite fast.

If the cadence is indeed broken, you could run a FFmpeg script that will kick out frames that are too much alike. (But that will kill you on static shots…)

Bouke / edit 'B

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