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1080i / Broadcast Question

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Eric Guiliani
1080i / Broadcast Question
on Jun 15, 2017 at 3:42:39 pm

Hey Everyone,

I need to supply a TV spot in either of these ways resolutions and framerates:

- 1080i (29.97)
- 1080p (23.98)
- 720p (59.94)

I set up my main comp to the 1920x1080 HDTV 29.97 setting in AE, which I believe is 1080p. Does anyone know how to convert it or export it to 1080i? Not sure why the 1080p would only allow 23.98 and the "i" version the 29.97.

Also, which would be the better version to deliver? I tried dropping the comp into a 23.98 comp and it looked choppier, obviously. This is my first real TV commercial so any help appreciated! My experience is more animation/mograph for web and social... not broadcast!


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Richard Garabedain
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 3:50:00 pm

Composition add to- adobe media encoder...thats where you can change all these settings more easily


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Eric Guiliani
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 3:51:35 pm

Thanks. So I can literally just downsample/downgrade to 1080i no issues? Will it still look good? (Hope so!)


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Richard Garabedain
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 4:16:30 pm

Oh you wanted to downgrade to 720p...I thought you wanted 1080 Interlaced...but yes either way media encoder is the answer...just note that in media encoder 1080 i is interlaced.


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Eric Guiliani
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 5:01:31 pm

No, I def want to make my 1080p to 1080i, I figured that was "downgrading" but maybe I'm wrong.


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Dave LaRonde
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 5:06:06 pm
Last Edited By Dave LaRonde on Jun 15, 2017 at 5:06:30 pm

[Eric Guiliani] "I need to supply a TV spot in either of these ways resolutions and framerates:

- 1080i (29.97)
- 1080p (23.98)
- 720p (59.94)"


Is there any live-action footage in your composition? It makes a big difference. If yes, how was it shot -- frame rate, progressive/interlaced, horizontal/vertical dimensions?

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Eric Guiliani
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 5:21:47 pm

Yes, there is live action. Its all stock footage, some at 23.98fps and some at 29.97fps.

The question is, what will look better, keeping the 29.97 framerate and exporting that to 1080i with the same framerate... or throwing my main comp into another comp, changing that framerate of that "container" comp to 23.98 and exporting to 1080p?


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Dave LaRonde
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 6:06:55 pm
Last Edited By Dave LaRonde on Jun 15, 2017 at 6:07:37 pm

Since you're mixing frame rates -- a very bad idea indeed -- your frame rate and resolution options are limited to a grand total of one (1). You'll need to do the following:
  • Change the frame rate of your current 1080 comp to 59.94. Yes -- change it.
  • Create a 1280x720, 59.94 frames/sec comp
  • Nest the 1080 comp in the 720 comp and scale the nested comp to fit in the new 720 comp.
  • Use the new 720 comp for export for final delivery.

Your error was in mixing frame rates. The ONLY frame rate that can accommodate both 29.97 and 23.976 is 59.94, and the ONLY resolution capable of accommodating 59.94 is 1280x720.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Eric Guiliani
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 6:23:57 pm

Thanks Dave. I don't really see another way around things considering the stock footage was what it was (different frame rates); I had to mix it. Also the live action footage is used in artistic ways, its not really full screen and "in your face." It seems bringing an exported 1080p MOV into media encoder and making a 1080i MOV looks OK. Anything wrong with that? Also, I'd prefer 1080 resolution rather than 720. Do I have other options?


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Eric Guiliani
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 6:26:15 pm

Oh I should have also mentioned I even have a 25fps video in there as well. I thought AE takes care of framerates for you and adjusts accordingly?


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Dave LaRonde
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 6:33:17 pm

[Eric Guiliani] "I thought AE takes care of framerates for you and adjusts accordingly?"

It does not. It never has. It simply accommodates them, and the result is often irregular choppy motion. That's why mixing frame rates is such a big no-no.

But hey -- if upon scrutinizing the motion in your exported 1080 file things look okay, you might have lucked out. I stress the "lucked out" part.

Unless you understand how the software deals with various frame rates and you have experience in which frame rates can be mixed without problems, I STRONGLY advise against doing so.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Eric Guiliani
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 7:05:16 pm

So if you have a project with multiple stock clips at different framerates, what would you do? Real world = not everything is shot with the same camera / framerate.

Also, what can I do if I want to still have 1080 resolution? I only did a test file that I told you about (media encoder 1080i), I have some time so willing to fix things to make it right.


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Eric Guiliani
Re: 1080i / Broadcast Question
on Jun 15, 2017 at 7:12:22 pm

This is a motion graphics piece. I just looked and I literally have texture footage, live action footage and literally have 23.97, 25, 29.97 and 30 fps videos all being placed into a 29.97 main comp. Things look ok when I export to .MOV 1080p 29.97. What I'm worried about is the file I need to convert for broadcast. So its really that main aforementioned movie that needs converting.


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Dave LaRonde
Re: 1080i / Broadcast Question
on Jun 16, 2017 at 2:16:48 am
Last Edited By Dave LaRonde on Jun 16, 2017 at 2:43:50 am

Real world=you make damn well sure they do match, either by conversion, knowledge of what works or conforming.
It's the ONLY way to guarantee that motion will work as expected, especially if you have to deal with interlacing.

End of story. So get smart about this stuff, or suffer the consequences in the future.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Eric Guiliani
Re: 1080i / Broadcast Question
on Jun 16, 2017 at 4:32:32 am

Dave, ever work with big household name clients that have art directors and producers select stock footage you have to use? None of this is not being smart. This was a messy project before I got involved. I have about 30 different required clips, all varying frame rates and resolutions and on a tight time crunch. I'm using many of them as artistic elements and textures. No time to convert them all as some are only up on screen for a second. Just not worth it for what, a few dropped frames? And you don't just convert each video without expensive services or software I don't have. Any converting I do will have to be on adobe.

Either way, if I check the preserve frame rate in the comps holding the footage, is that a work around? Seems it would still have to convert somehow if the main comp is 29.97.

The CC and trafficking pub said I can supply them with a 1080p, 29.97 ProRes, which was my original question.


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