In my opinion, version 5.4 did not stream on Linux because I found that it uses Invenc12, but Nvidia officials told Invenc12 that driver 550.54 is required. At the same time, Vulkan 1.3.250 in UE5.4 does not support Nvidia driver 550.54 and higher versions. Currently, it only supports driver 550.40 and lower versions, which means that the Nvidia driver version on Linux is not compatible with the Vulkan version in Unreal Engine