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MediaNerdNL
MediaNerdNL
Participant
February 3, 2026

After Effects 26.0.0 incorrectly renders to interlaced files

  • February 3, 2026
  • 13 replies
  • 418 views

As of AE version 26.0.0 renders that should be rendered to an interlaced format end up as incorrect.
The duration of the export is correct, though the content is playing at 200% and the rest is filled with a solid black (No transparancy)

This workflow has worked for me for 20+ years. Unless I’ve fundamentally messed something up in my workflow this seems like a pretty severe bug, as the reality is that most of linair television still runs on interlaced.

  1. Create new composition at 25 fps (in PAL-cases)
  2. Add content
  3. Add composition to render queue
  4. in Render Settings change Field Render to Upper Field First
  5. Change output to Quicktime (422, 4444, animation; all have the same outcome)
  6. Render

    13 replies

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    MediaNerdNL
    MediaNerdNLAuthor
    Participant
    February 5, 2026

    So the only setting I’ve changed for this example is setting the field render to Upper Field.
    It doesn’t matter if I render with or without alpha. The bug occurs in all the cases.

    I’ve made an example project with some simple text. The render queue is already set up with the aformentioned render settings. (So all the 50i renders have the same issue. regardless with or without alpha).
    It doubles the content speed and fills the 2nd half of the file with black

     

     


    I’ve rendered a short 2sec example which you can replicate:

    Rendered as 25p Rendered as 50i
    25P NO ALPHA @ 00:01:00

     
    50i NO ALPHA @ 00:01:00

     
    25p ALPHA @ 00:01:00

     
    50i ALPHA @ 00:01:00

     

     

      R
      Community Expert
      Rick GerardCommunity Expert
      Community Expert
      February 5, 2026

      I opened your sample comp, added one more copy to the Render Queue, rendered, then imported the videos. All were the same length as the comp. No problems were found.

       

      R
      Community Expert
      Rick GerardCommunity Expert
      Community Expert
      February 4, 2026

      What are your Alpha Channel settings in the Render Queue…


      You can only see Alpha Channels in an editing app like Premiere Pro, Davinci or After Effects. Video Players do not honor the transparency.

      A
      A Boo
      Participant
      February 4, 2026

      These are the settings. I have been using this setup for over 10 years. Also the problem is ot the players. The rendered file is incorect we imported into davinchi. For examble for a video of 10 seconds duration the video plays 200% faster. So you end up having a video that plays your content for 5 sec and the next 5 sec is solid black as “MediaNerdNL” mention too.

      So it has nothing to do with the settings.

       

       

        A
        A Boo
        Participant
        February 4, 2026

        We are experiencing the same problem. Please advise.

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