OBS stream lags

[Lucky5]

For starters here are my settings: 3500 bitrate x264 encoder set to faster, the output is 720p being scaled down from 1440p, Lanczos 32 sample 60fps process priority is normal
PC specs: ryzen 7 1700 stable 3.9ghz, 16gb 2933mhz ram 14cl, vega 64 (undervolted and stable) cpu stays below 70c and gpu stays under 80c for core and hbm when trying to stream/play games
When I try to stream to twitch the stream will be extremely choppy, lag behind and be a complete mess, I've played around with lower bitrate, higher bitrate, and the sample rates as well as changing the CPU encoder priority

Sorry if I didn't put important info I'm tired and really annoyed that it won't work, I just want buttery smooth 720p 60fps streaming.

[Skiiwee29]

The problem is because of a GPU Allocation bug in OBS. Basically, when your GPU is over 85-90% used, OBS starts losing frames and no longer outputs a smooth 60 fps. You will need to cap your FPS to lower your GPU usage to allow enough overhead. With my 2080ti at 1440p/144hz I have mine capped at about 80fps with Nvidia Inspector and this provides enough GPU resources left for it to be able to render. Since you have a Vega 64 card, you will need to use Rivatuner to cap your FPS. 

[Lucky5]

1 minute ago, Skiiwee29 said:

The problem is because of a GPU Allocation bug in OBS. Basically, when your GPU is over 85-90% used, OBS starts losing frames and no longer outputs a smooth 60 fps. You will need to cap your FPS to lower your GPU usage to allow enough overhead. With my 2080ti at 1440p/144hz I have mine capped at about 80fps with Nvidia Inspector and this provides enough GPU resources left for it to be able to render. Since you have a Vega 64 card, you will need to use Rivatuner to cap your FPS. 

I forget to mention I'm using streamlabs obs, and I also do 144hz so capping to something like 80fps would not be a very enjoyable experience, also how can a bug like this still be a thing? it has to be more specific than just gpu usage at 85-90%, also I thought x264 was for cpu so why would gpu affect performance in obs in the first place?

[Skiiwee29]

Just now, Lucky5 said:

I forget to mention I'm using streamlabs obs, and I also do 144hz so capping to something like 80fps would not be a very enjoyable experience, also how can a bug like this still be a thing? it has to be more specific than just gpu usage at 85-90%, also I thought x264 was for cpu so why would gpu affect performance in obs in the first place?

OBS still needs to render some frames in the GPU to display. The encoding is done through the CPU, not the frame rendering, thats still done on the GPU side. 

[Lucky5]

Just now, Skiiwee29 said:

OBS still needs to render some frames in the GPU to display. The encoding is done through the CPU, not the frame rendering, thats still done on the GPU side. 

is there any other way to fix this without having to cap my in-game fps to lower gpu usage?

[Skiiwee29]

Just now, Lucky5 said:

is there any other way to fix this without having to cap my in-game fps to lower gpu usage?

Sadly no. Ive done 10+ hours of research in the past few weeks and tweaking and testing myself and this is the only way to fix it without having a dual streaming PC setup. 

[Lucky5]

Just now, Skiiwee29 said:

Sadly no. Ive done 10+ hours of research in the past few weeks and tweaking and testing myself and this is the only way to fix it without having a dual streaming PC setup. 

was planning on getting a 3700 or 3900x and whatever navi card beats the 64, I guess i could reuse my old 1700 as a server/streaming pc

[Skiiwee29]

Just now, Lucky5 said:

was planning on getting a 3700 or 3900x and whatever navi card beats the 64, I guess i could reuse my old 1700 as a server/streaming pc

Would be the best way to do it so you can game at full power on your main rig. 

[SubTract]

You can use Radeon chill under the wattman tab to limit your fps if you want to. 

 

I would try setting the affinity of obs to use threads 8-15 (I'm unsure of how windows assigns threads, you may end up wanting to assign 4-7 and 12-15 instead)

 

It might not help but it's worth a try.