Can't export at the same frame than sequence

[Grafema]

Hello, 

I've read other topics, but I can't find a solution.

I'm trying to export a banner for a stadium with the following setting (required by the advertising agency): 
1920x90 pixel format .mp4 codec h264, 60 fps

I set "Custom"in Editing Mode and then I set other parameters without problem, but when I try to export (in Premiere Pro or with Media Encoder) I can't do it at 1920x90 pixel. 
If I unchain the proportion block, I can chose only 88 or 92 as height. 
I know some codec requires divisibility for 4 or 8, but I'm using H.264, so I can't find the problem... I'm a graphic designer and I'm still learn how to use Premiere.
Here's the screenshots:

My sequence settingsThe export settings

[Ann Bens]

Resolution parameters need to be divide by 4 for H.264, hence the 88.

[Grafema]

Thank you. I thought it should be divide by 2... do you think the parameters I had from the agency are incorrect?

[Ann Bens]

Sorry you can export 1920x90. Dont uncheck the chain.

[Grafema]

If I don't uncheck the chain, I export only 1920x88.

[Ann Bens]

You changed the aspect ratio from 1.0 to 1.33.

[Grafema]

I tried both...

[Grafema]

And now I tried "Custom" 1:1 too.

[Ann Bens]

Leave the box on the right checked.

[Grafema]

I did. When I open the export settings window, the square box is already checked and the resolution is already fix at 1920x88.

[Ann Bens]

Make new sequence, give it a different name. Copy everything over and try again.

[Stan Jones · Accepted solution]

I assume the "prima campo superiore" in your sequence settings is upper field first. When I create a test using progressive, I have no problem getting h.264 export at 1920x90. As soon as I switch to upper field, the pixel size goes to 1920x88. Is the spec supposed to be progressive?

[Grafema]

Hello Stan,
yes, "prima campo superiore" is "upper field first". Now I tried to change my sequence setting and it works, as you said. I don't know much about spec, I just follow the parameters from agency, so I think that's okay now. 

Thank you everyone!