Mouse sensitivity is different between large resolution / ultra wide frontend and standard 1080p

[DenisTensorWorks]

Originally opened by @adrian-j-programmer

UE Version:
E.g. UE 5.2.1

Problem component
Pixel Streaming Input

Description
In projects where mouse axis input is used to pan the camera, the perceived mouse sensitivity is different between ultra-wide, 4k and 1080p resolutions.

We use the new dynamic resolution feature, so the resolution of the application adjusts to the stream viewport size. The issue seems to be connected to the resolution of the monitor somehow.

Steps to Reproduce:

1. PixelStream the Third Person Example project to a local browser tab when display resolution is set to standard 1920x1080
2. Repeat step 1 with ultra-wide display resolution
3. Repeat step 1 with display resolution set to 4k
4. Notice mouse sensitivity of camera panning increases the higher the display resolution is

Expected behavior
Mouse sensitivity is the same regardless of the display resolution used by stream receiver.

Platform (please complete the following information):

• Windows 11 Home 22H2
• Firefox 116.0.3

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Moved from EpicGames/PixelStreamingInfrastructure#351