Why is my App Store Connect 'app preview' the wrong size?

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I'm trying to create an App Preview for my ios app in App Store Connect. I'm targeting 6.5" displays.

I successfully created the .mov file using QuickTime, recording my app activity on my iPhone XR. However, when I uploaded the file to App Store Connect, it said App preview dimensions should be: 1920x886, 886x1920.

According to Apple, the Accepted resolution is different than the Native resolution (see image below).

How can I create an App Preview if the native size isn't the correct size? Is there a way to use QuickTime or iMovie to either edit or record the right size?

Also, I'm not using Xcode as this is a phonegap project.

Thanks for your help!

You will need to resize the video. Record it first on the targeted device in full resolution. After that you can resize it with tools like iMovie, AfterEffects, ffmpeg or similar.

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It happened to me as well and I needed to change the format with ffmpeg from .mov to .mp4 in order for the video to be accepted by the App Store Connect.

This command line did the job:

ffmpeg -i input.mov -acodec copy -crf 12 -vf scale=886:1920,setsar=1:1 output.mp4

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If you have ffmpeg installed, here's the copy-paste command (from here):

ffmpeg -i input.avi -vf scale=320:240 output.avi

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Comments
  • Thanks for the response. The problem is, the native resolution is a different aspect-ratio than the accepted resolution. This means that scaling the video alone won't work; the video would actually need to be cropped first, then scaled. iMovie doesn't seem to allow precise cropping -- it's done by hand, which won't work because it's not precise.
  • Difference is 1-2px. You can definitely size it with ffmpeg or AfterEffects and you won't notice the distortion. (2688/1920 = 1,4; 1242/1,4 = 887,14)