Those will cover the capture plugins, but OBS still needs XWayland to run due to...

Jnr · on April 1, 2020

There is an even cooler pull request that adds zero-copy screen capture. https://github.com/obsproject/obs-studio/pull/1758

I think this is a better way to go to get the same performance and low latency gaming capture as on Windows with gaming GPUs.

The guy who made that PR frequently streams coding sessions on Youtube. I think he made it because he wanted a better way to stream some cool live opengl coding sessions. And even though that code isn't production ready, he has used it for some time now and it seems to work great.

If there is some company that slightly cares about Linux desktop and gaming on Linux, I would suggest helping with that pull request and getting it merged. (Anyone from Steam, AMD or Nvidia here?)

cycloptic · on April 1, 2020

Some of the EGL portions of that PR are actually included in the one I linked :) At some point my plan is to go through and merge these all together if no one else does it, but streaming has not been a priority for me at the moment.

lvh · on April 1, 2020

Whoa, that's awesome! I tried to get the same thing working with ffmpeg, a la:

  ffmpeg -device /dev/dri/card1 -f kmsgrab -i -
    -vf 'crop=4096:2160:0:0,hwmap=derive_device=vaapi,scale_vaapi=w=4096:h=2160:format=nv12'
    -c:v h264_vaapi -qp 24 output.mp4

... and that process was, um, exciting, but not in a good way if you care about having an MP4 at the end with minimal fuss.

lvh · on April 1, 2020

Right, I figured capturing is the big ticket item, and that most people wouldn't care what OBS itself runs on. Is there a reason to care about it running on XWayland other than being able to say you don't need X at all anymore? Would you expect to see major improvements for apps that are already doing all their heavy lifting in GLX on X11?

cycloptic · on April 1, 2020

>Is there a reason to care about it running on XWayland other than being able to say you don't need X at all anymore?

I personally don't on my setup but the reason to do it is so other plugins can make use of EGL extensions. Native Wayland support just comes along with that trivially. Future development on platform-integration extensions is expected to happen in EGL instead of in GLX. For a current example the other PR that does direct KMS capture needs EGL to work, even with the X11 backend.