I have in input a DNxHD 120 in mov container 25fps interlaced upper field, I have to do various kind of edits, cuts, replace some pieces with after effects compositions and at the end of all the job export everything as a MXF 25fps again interlaced upper field.

Until now I always worked only with progressive contents so I'm unsure if what I'm doing is correct:

  • I imported the footage into the project

  • Created a new sequence based on what i think is the correct format: 1080 25fps interlaced upper field

  • Started cutting, pasting and replaced some after effects comps

  • Export with media encoder using the DNxHD SD 1080i 50 (i wonder why i can't find a 1080i 25 preset), however even if is writtend 50 it seems i can pick 25 fps.

Is all this correct ? I mean what's the best practice ? I'm keeping everything interlaced upper field. I think Premiere is a professional software able to handle all the footage in interlaced without problems.


Should I instead convert and make everything progressive first and then export again back in interlaced? (i fear this solution is not very good)

I also have this error if i try to rotobrush the footage:

enter image description here

This is starting to confuse me even more, why i should use a 50fps ?

  • interlacing means half resolution fields at double the frame rate. Hence the 50fps.
    – stib
    Commented Nov 23, 2017 at 22:33

1 Answer 1


As for how to work... it all depends on what your final destination is. Are you working on a piece to be broadcasted, or for the Web? In the latter case, the final product should be progressive. If the former... the in turn it depends on your source material, which seems to be interlaced.

So you should:

  1. Create an interlaced project, "1080i50". The "50", in this case, doesn't mean "frames per second", but "fields per second" (2 fields = 1 frame).
  2. Work as you would normally in Premiere.
  3. Export it in an interlaced format too. "1080i50" sounds good, but again, that depends on the final destination of your piece.
  • Regarding the after effects warning do you have some ideas ? Commented Nov 28, 2017 at 15:41
  • It's been a while since I've had to work with interlaced content, so I don't remember offhand, but doing a quick Google search finds this: forums.adobe.com/thread/730692
    – PaulJ
    Commented Nov 28, 2017 at 18:20

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