stream's FPS not adhering to setting.

[jdancouga]

First of all, thank you all for this wonderful work. One thing that I missed from Nvidia cards was the ability to gamestream using moonlight. AMD's equivalent offerings are abysmal. Even parsec isn't as good as sunshine.

My rig is Ryzen 5900x & RX 6800xt. Overall, it works like a charm. The latency/decoding total is around 50msec even when I VPN (wireguard) from outside the house, which is totally acceptable for the games I play. However, the stream's FPS is one thing that got me scratching my head.

I have set moonlight app to 60fps, and tried all the combinations of rate control/quality setting/HW encode/SW encode/stream resolution&bitrate/minimum threads, etc., but my stream will always be lower than the 60fps setting. I am getting 50fps when streaming inside LAN, and 30fps or lower when streaming from WAN. I understand my crappy xfinity internet's 10mbps upload speed is not great, but Nvidia card did not have this problem as long as the bitrate/resolution is adjusted accordingly.

Is there a setting I mis-configured or overlooked? Or this is a limitation of AMD GPU?

[loki-47-6F-64]

On Windows, Sunshine grabs new frames when they are available. So the FPS you're setting as effectively merely an upper bound.

Still, I'd expect the FPS you're getting from LAN to be identical to WAN.
That's the odd part.

[jdancouga]

I did some more testing. It seems like my stream's FPS is dynamically adjusting even when I stream within LAN.

For example, I start a stream at the desktop, the FPS will stay around 10~20fps. Once I started moving the mouse around, the stream will slowly go up to 60fps. However, I am still getting 30fps in game no matter what.

Since I was seeing dynamic fps, I thought my freesync monitor was involved somehow. I turn off the freesync feature, but problem persists.

[BarryHuffman]

I'm just spitballing but do you use any traffic shaping on your LAN? (QoS, CAKE, ect)

Not specific to Sunshine but I've heard of steam stream without proper hardware encoding(GPU) on RADV has resorted to software encoding (CPU) with similar characteristics of throttling or choppyness.

My AMD GPU is much older but comparisons with AMDGPU-Pro encoding or on a intel iGPU using VAAPI encoding might be worth testing to rule out network related or driver related problems.

[jdancouga]

Update: Saw someone's reported Issues#253, and it is very similar to the problem I am experiencing. Tried v0.9.0 as suggested, and no longer suffer from low fps issue.