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Willie Frazier
Known Participant
December 11, 2018
Question

Interlaced footage looks way different from source

  • December 11, 2018
  • 1 reply
  • 2902 views

Hey guys,

I was recently tasked with some wire removal work which I did in AE (mostly using CC Simple Wire Removal).  I did the work and it looks great in the comp window and in a progressive export.  I did an interlaced export also but only scrubbed it as I had already QC'd the progressive.  I sent the clip in and they sent it back to clean up a couple of spots where the wire shows back up.  So, I bring the clip into AE and none of the problem areas I can see when looking at the clip in QT are present in the footage once imported in AE - meaning AE is doing something to this footage on the way in. I did of course check the footage interpolation settings, and the are set to separating (upper).  I don't understand then why the imported footage looks so different.  I can't very well fix the problem footage if I can't see the problem, so this is pretty big pickle I find myself in.

Any ideas?

(AE 2017 OSX 10.14.1)

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    1 reply

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    Willie FrazierAuthor
    Known Participant
    December 11, 2018

    To illustrate the problem, here is a frame in Quicktime, followed by the exact same frame in AE:

    I have been working in 2017, but I brought the footage in to 2018 to see if it would be any different

    W
    Willie FrazierAuthor
    Known Participant
    December 11, 2018

    Ok, so after some more digging, it seems the solution is to actually change the interpretation of the interlaced source to make it progressive.  Them After Effects generates a 1:1 preview with the interlaced source when viewed literally anywhere else.

    EXTREMELY counter-intuitive, but at least I am not hosed.

    Cheers

    Warren Heaton
    Community Expert
    Warren HeatonCommunity Expert
    Community Expert
    December 12, 2018

    It's been forever since I've worked with interlaced source, but if I remember correctly you want to go into Interpret Footage and set "Separate Fields" to off.  Then, work with the footage in a Comp that's double the frame rate (so, 59.94 for i29.97 source or 50 for i25 source). 

    If rendering back to i29.97, you can set custom Render Settings for the p59.94 Comp with the frame rate at 29.97 with correct Field Rendering Order enabled.

    -Warren

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