Code change:
Project description This flag is available in most other major distros. It is necessary to enable screen sharing on wayland inside of chromium, combined with xlr-desktop-portal-wlr and pipewire. It requires the build flag and a dependency on libpipewire02. See as an example. Metadata homepage URL: source URL: license: mit, bsd, gpl2+ , ... platforms: unix, linux, darwin, ...
that would definitely be nice to have :) I actually also noticed this but unfortunately cannot test this easily as I'm not using screen sharing. If you could contribute a PR that would be awesome (but be aware that Chromium does unfortunately take quite some time to compile). Alternatively (but less preferably) we could make the required changes with the next update and test the core functionality (as always) and you could test screen sharing after the new version is available in the binary caches. Additionally we would need to package in Nixpkgs to make this work on wlroots based compositors. On Gnome/KDE this might work out-of-the-box, but I don't know what they currently implement/provide.
was just merged w/ . I'll try building chromium w/ the flag - as you say it takes a while, so I can leave it overnight and give it a shot.
how does the situation look like with ? Is the flag available there, as in, screensharing with wayland already works there?
yes, it's available in google-chrome. ! I'm still trying to get it to work with xlr-desktop-portal-wlr - I've done this in the past, but it's not working out of the box yet with
And just to make sure, you also did set as described there?
yes I did. I'm almost got it working I think. There are a few issues out of the box: -chrome is missing the pipewire 0.2 runtime dependency, so I it as (I'm on 20.03 so pkgs.pipewire is 0.2): .pipewire service doesn't work - it doesn't seem to be setting up the path correctly. I'm trying to fix this now: My current config on 20.03 looks like: Where is the same package that was recently merged.
yeah, I'm currently already looking at it - pipewire wants to execute , but it's not in . We can patch to contain the absolute path. I'll check if it works and will get back to you.
Btw, we /really/ need a sway NixOS test, and better documentation on how to use sway. I was trying stuff until it worked, and does autologin me into a sway, but there might be a smarter way to do this, without also starting X.
The sway recommendation is to just run sway from the terminal after login - that's how I do it at least. I was able to workaround the environment issue by doing (but this is a kludge I think and shouldn't be necessary). But unfortunately it's now crashing and I'm not sure why:
Yeah, even my sddm config I also had to , otherwise pipewire complained about not being able to reach dbus: Afterwards, it segfaulted, as it wasn't able to find ; I patched to be able to find the path to , and that error message is gone. Now (apart from not being able to find bluez or rtkit) it /might/ only be some version incompatibilities, not sure: I'll see if I can get as far with your chromium PR, will merge that then, and also submit the pipewire patch.
Okay, with the pipewire patch and , It seems I'm able to share at least my own application window :tada:. I don't know yet why the alacritty window nearby isn't shown, and why "Entire Screen" is black, but that's probably due to me running sway inside X via ssdm.
pipewire PRs:
I don't think you're using pipewire in that case. xdg-desktop-portal-wlr only supports full screen sharing atm. If it is black that means it's not working. By the way I had to add pipewire02 to my system packages to prevent xdg-desktop-portal from crashing. But now there seems to be some incompatibility in the pipewire service logs when chrome tries to connect:
you should be able to cherry-pick the to not have to manually add this to $PATH.
Thanks! I'm suspecting google-chrome is compiled with a too old version of pipewire. Enabling pipewire debug logs, it seems to be sending an incompatible format to the pipewire server (similar to ). I have got this working with chromium compiled against pipewire 0.2.7 in the past, so I'm pretty sure it should work assuming the client library is recent enough. Once the chromium package has that flag enabled I'll try to retest.
I just confirmed my last comment by building chromium locally w/ rtcusepipewire=true. It works perfectly for fullscreen sharing.
Hmm take that back - it worked the first time but not anymore :/. Not sure what lib is missing where.
Seems like xdg-desktop-portal is crashing:
This might be yet another version incompatibility problem. I propose merging (as it's built with 0.2 everywhere else too), and then see if we can get it to work if the system pipewire also is 0.2. I asked upstream about these problems in - maybe 0.3 needs to support 0.2 clients for some time until we should switch.
Heads-up: the bad client situation should have been fixed with the latest pipewire release, PR at
Thanks for your help! I'm still getting the xdg-desktop-portal crash, however. I'm guessing there is something missing from my dbus environment - or perhaps it's trying to access a file/directory not available in nixos.
could you open a new issue with some more details, like logs etc.?
Okay, I made

Related discussion:
text: # added later in the wrapped -wv build or downloaded from Google. enable_widevine = true; use_cups = cupsSupport; <ins> # Provides the enable-webrtc-pipewire-capturer flag to support Wayland screen capture. rtc_use_pipewire = true; </ins> treat_warnings_as_errors = false; is_clang = stdenv.cc.isClang;