[FoxForceFive]

Ok, it was mentioned earlier in the thread that the firestick was displaying 4k files in 1080p resolution, & TBH, it was driving me mad.

Set out to reproduce it, & I've tracked the culprit down after reading the logs.

In Settings>Display, Set GUI resolution limit is affecting video playback (despite it clearly saying that it doesn't affect video playback).

If you set this to Unlimited, your 4k files will play perfectly at the correct frame rate. The downside is all files will play at 4k resolution, but they'll be in the correct frame rate (basically the firestick will be doing the upscaling for you).

If set to Auto, your 4k files will only play at 1080p at the correct frame rate. The upside is all files will play at their correct native resolution & frame rate.

For me setting it to Unlimited is a decent workaround for the time being, the upscaling isn't far off what my set does itself.

I've created two bug logs, one with unlimited set & one with auto, & will submit it to the bug tracker later this evening or this weekend (when I get the time).

I hope this helps some of you, it's certainly good for those of us who need frame rate switching & want to watch 4k at the correct resolution.