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Exporting 4K 9:16 (2160 x 3840) downsizes to 1216 x 2160, why?

I have created a 4K 9:16 project (2160 x 3840), however when trying to export it the file that’s saved is only 1216 x 2160, which nowhere near 4K.


How can I create an mp4 or m4v in the correct size, 2160 x 3840. I have Compressor, but cannot find the option to alter the size. Perhaps I’m looking in the wrong places.


All suggestions are very appreciated!

Posted on Jan 10, 2020 10:52 AM

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Posted on Jan 10, 2020 11:09 AM

I tested in Compressor and FCP X and for Apple Devices 4K, the horizontal max is 2160.


Exporting a Master File as either ProRes or H264 in 2160x3840 DOES work.

Also, converting a ProRes file with these dimensions in the Finder (control-click, Services->Encode Selected Video Files) works, and lets you produce an H264 or HEVC file with the same dimensions.

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Jan 10, 2020 11:09 AM in response to Luis Sequeira1

I tested in Compressor and FCP X and for Apple Devices 4K, the horizontal max is 2160.


Exporting a Master File as either ProRes or H264 in 2160x3840 DOES work.

Also, converting a ProRes file with these dimensions in the Finder (control-click, Services->Encode Selected Video Files) works, and lets you produce an H264 or HEVC file with the same dimensions.

Jan 10, 2020 11:11 AM in response to Luis Sequeira1

I used a 4K preset I made in Compressor (I wanted a higher bitrate than the one available in the built in Apple Devices), I now see that I based it on the Apple Devices, just upped the bitrate.


Since I used a saved profile, I did not get any choices except file name.


If the limit is inherited from Apple Devices that would be the explanation.

Exporting 4K 9:16 (2160 x 3840) downsizes to 1216 x 2160, why?

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