ALVR: Bad visual quality when using hardware encoder

Description

In hardware encoder mode, if you don’t move the headset, the color of the screen gradually changes, so after 10 minutes it becomes so pixelated that you can’t see anything.

The problem arises in three ways.

1. Erroneous color that ripples from left to right, and fades slowly. At this time, it is only in the left eye, and there is no problem in the right eye, but if the left eye is almost completely smeared, the right eye will also gradually develop. Solved by restarting ALVR or use software encoder.
2. This occurs when ALVR is turned on for the first time. Bitrate drops to 0.05 ~ 0.003 Mbps and the screen cannot be read properly. (Using CBR 30Mbps) This problem can be solved by using a software encoder.
3. If you don’t move the headset (example - VR movies), pixelation will gradually progress with the wrong colors, and the screen will turn completely white after about 10 minutes. This problem can be solved by moving the headset over 200 degrees to change what is displayed on the screen or use software encoder.

General Troubleshooting

• I carefully followed the instructions in the README and successfully completed the setup wizard
• I read the ALVR Wikis here and here

Environment

Hardware

https://linux-hardware.org/?probe=d1da7498da

Installation

ALVR Version: v20.0.0-dev07+nightly.2023.3.15

SteamVR Version: 1.25.7

Install Type:

• Packaged (exe, deb, rpm, etc)
• Portable (zip)
• Source

OS Name and Version : Ubuntu 22.04.1 LTS