No, Premiere Pro does not output 4K files that will be "unstable" for only some YT players/devices, after YT has transcoded the file created by Premiere Pro. If you upload 4K, 4K is what you get. If you don´t, there is an issue with YouTube and the way it streams to different devices and or the devices as well. Post your question in a YouTube forum/facebook group/etc/etc as well for best help since you have an issue with YouTube, not Premiere Pro. 🙂
If you can watch the uploaded file in 4K at device A, there is not Premiere Pro´s fault that you cant see it at device B and C.
I have never heard of a similar issue, iow that one upload a (any resolution) file to YT and that Premiere Pro adds some code to the file so that some users on YT can only look at the file in lets say 720p though the file uploaded were 4K. If it happens, it always boils down to the device/player/streaming platform that for some odd reason fails to playback in max resolution. Update the web browser could fix it in some cases, as could Flash Player back in the day.
I can playback the youtube link as 4K in my web browser.
Maybe someone chimes in with a correct answer here. 🙂
Maybe there was a bug in 25.4 which made 4K output "unstable", throwing off recent changes in the YouTube 4K processor. I have no idea whether 25.5 adds any rendering-related changes, but I guess it's worth a shot.
Can you think of anything else I can test?
By @Tripecac2
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