Wrong resolution in export 4K presets?

[petermag78]

If i choose a H.264 4K preset for Youtube or Vimeo in the in export the outputfile resolution will be downscaled to 2976x1674 if i dont change it manually to 4K (3840x2160). Is there an error in the presets or does 4K on YouTube etc dont relly want full 4K?

[Ann Bens]

...so we dont have to download unknown files: we help you, you help us. Thanks! 

[Ann Bens]

That is an odd resolution.

Might want to start with resetting preferences.

FAQ: How to reset (trash) preferences.

[davidarbor]

Can you post a larger screenshot showing the Video tab? Is the checkbox next to the width and height checked? If you click the big "Match Source" button does that fix this?

Also, what happens if you queue this file to Adobe Media Encoder and apply the same preset there?

[RjL190365]

I have discovered exactly the same thing on my system, as well. It turned out that it's the limitation of Adobe's (or rather MainConcept's) implementation of the NVENC hardware encoder. 3k is the maximum that one can do for H.264 and still have hardware encoding even though NVENC technically supports true 4k. If you force 3840x2160, the encoder will default to software-only encoding.

[Michael Grenadier]

so this is a 3rd party plug-in???

[RjL190365]

No. It's just that Adobe never really had an in-house H.264 or HEVC encoder to begin with. In fact, all of Premiere Pro's MPEG encoders (this, by extension, includes the H.264 and HEVC encoders) are actually sourced or licensed from MainConcept.

[Ann Bens]

Are you sure. I dont see an odd resolution for 4K when HWE for Nvidia is set.

[RjL190365]

I'll get a 4k video imported some time later today.

[RjL190365]

That is the default setting for the preset. And the problem stems from the default profile setting as someone mentioned. Thus, it had to downscale the resolution according to the frame rate in order to deal with the limitations of the High 5.1 default.

[Averdahl]

Ann Bens, you will see it if you use the same frame rate as the TS, iow 50 fps. 🙂

I could not see it either until i realized that i tested on a 24 fps timeline. When i changed it from 24 to 50 i could reproduce it.

[Ann Bens]

50p: If you raise the level to 5.2 problem solved.

[Averdahl]

Huh, i went directly for the 6.2 setting...

[davidarbor · Accepted solution]

Try increasing the Profile Level to 5.2. 5.1 maxes out at 31.7 fps for 3840x2160: https://en.wikipedia.org/wiki/Advanced_Video_Coding

[petermag78]

Thanks that solved the problem!