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PipeWire Screencast Info
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| #!/bin/sh | |
| pw-dump | jq -r '[.[] | select(.info.props."node.name" | IN("firefox","gnome-shell","kwin_wayland","obs","xdg-desktop-portal-wlr","xdp-screencast.py")) | .id] as $pw_node_ids | [ .[] | select(.info.props."node.id" | IN($pw_node_ids[])) | .id ] as $pw_port_ids | .[] | select(.id | IN(($pw_node_ids + $pw_port_ids)[]))' |
Thanks for clarifying. To be clear, I had checked both with and without an active screenshare, and the output was the same. I just checked again. I already went through the rest of the troubleshooting steps, so I can at least verify that all the pieces are running.
I assume that for some reason the screenshare isn't even starting properly. I tried seeing if firefox or xdg-desktop-portal-wlr showed any errors, because they did with previous issues I had before, but there's nothing I can see. I did capture wlr's debug logs, in case they shed any light - clearly it's trying to do something:
wlr debug logs
$ /usr/lib/xdg-desktop-portal-wlr -l DEBUG
2023/08/10 22:37:07 [INFO] - config: no config file found, using the default config
2023/08/10 22:37:07 [DEBUG] - config: outputname: (null)
2023/08/10 22:37:07 [DEBUG] - config: max_fps: 0.000000
2023/08/10 22:37:07 [DEBUG] - config: exec_before: (null)
2023/08/10 22:37:07 [DEBUG] - config: exec_after: (null)
2023/08/10 22:37:07 [DEBUG] - config: chooser_cmd: (null)
2023/08/10 22:37:07 [DEBUG] - config: chooser_type: default
2023/08/10 22:37:07 [DEBUG] - config: force_mod_linear: 0
2023/08/10 22:37:07 [DEBUG] - dbus: connected
2023/08/10 22:37:07 [DEBUG] - wlroots: wl_display connected
2023/08/10 22:37:07 [DEBUG] - pipewire: pw_loop created
2023/08/10 22:37:07 [DEBUG] - pipewire: establishing connection to core
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register wl_shm (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: |-- registered to interface wl_shm (Version 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register wl_drm (Version: 2)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwp_linux_dmabuf_v1 (Version: 4)
2023/08/10 22:37:07 [DEBUG] - wlroots: |-- registered to interface zwp_linux_dmabuf_v1 (Version 4)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register wl_compositor (Version: 5)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register wl_subcompositor (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register wl_data_device_manager (Version: 3)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwlr_gamma_control_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zxdg_output_manager_v1 (Version: 3)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register org_kde_kwin_idle (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register ext_idle_notifier_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwp_idle_inhibit_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwlr_layer_shell_v1 (Version: 4)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register xdg_wm_base (Version: 2)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwp_tablet_manager_v2 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register org_kde_kwin_server_decoration_manager (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zxdg_decoration_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwp_relative_pointer_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwp_pointer_constraints_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register wp_presentation (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwlr_output_manager_v1 (Version: 4)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwlr_output_power_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwp_input_method_manager_v2 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwp_text_input_manager_v3 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwlr_foreign_toplevel_manager_v1 (Version: 3)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register ext_session_lock_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register wp_drm_lease_device_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwlr_export_dmabuf_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwlr_screencopy_manager_v1 (Version: 3)
2023/08/10 22:37:07 [DEBUG] - wlroots: |-- registered to interface zwlr_screencopy_manager_v1 (Version 3)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwlr_data_control_manager_v1 (Version: 2)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwp_primary_selection_device_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register wp_viewporter (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register wp_single_pixel_buffer_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zxdg_exporter_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zxdg_importer_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zxdg_exporter_v2 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zxdg_importer_v2 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register xdg_activation_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwp_virtual_keyboard_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwlr_virtual_pointer_manager_v1 (Version: 2)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwlr_input_inhibit_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwp_keyboard_shortcuts_inhibit_manager_v1 (Version: 1)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register wl_seat (Version: 8)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register zwp_pointer_gestures_v1 (Version: 3)
2023/08/10 22:37:07 [DEBUG] - wlroots: interface to register wl_output (Version: 4)
2023/08/10 22:37:07 [DEBUG] - wlroots: |-- registered to interface wl_output (Version 4)
2023/08/10 22:37:07 [DEBUG] - wayland: registry listeners run
2023/08/10 22:37:07 [DEBUG] - wlroots: linux_dmabuf_feedback_handle_main_device called
2023/08/10 22:37:07 [INFO] - xdpw: Using render node /dev/dri/renderD128
2023/08/10 22:37:07 [DEBUG] - wlroots: linux_dmabuf_feedback_format_table called
2023/08/10 22:37:07 [DEBUG] - wlroots: linux_dmabuf_feedback_tranche_target_devices called
2023/08/10 22:37:07 [DEBUG] - wlroots: linux_dmabuf_feedback_tranche_flags called
2023/08/10 22:37:07 [DEBUG] - wlroots: linux_dmabuf_feedback_tranche_formats called
2023/08/10 22:37:07 [DEBUG] - wlroots: linux_dmabuf_feedback_tranche_done called
2023/08/10 22:37:07 [DEBUG] - wlroots: linux_dmabuf_feedback_handle_done called
2023/08/10 22:37:07 [DEBUG] - wayland: dmabuf_feedback listeners run
2023/08/10 22:37:15 [INFO] - dbus: create session method invoked
2023/08/10 22:37:15 [INFO] - dbus: request_handle: /org/freedesktop/portal/desktop/request/1_28/webrtc_107886671
2023/08/10 22:37:15 [INFO] - dbus: session_handle: /org/freedesktop/portal/desktop/session/1_28/webrtc_session557058456
2023/08/10 22:37:15 [INFO] - dbus: app_id:
2023/08/10 22:37:15 [INFO] - dbus: select sources method invoked
2023/08/10 22:37:15 [INFO] - dbus: request_handle: /org/freedesktop/portal/desktop/request/1_28/webrtc1001353819
2023/08/10 22:37:15 [INFO] - dbus: session_handle: /org/freedesktop/portal/desktop/session/1_28/webrtc_session557058456
2023/08/10 22:37:15 [INFO] - dbus: app_id:
2023/08/10 22:37:15 [DEBUG] - dbus: select sources: found matching session /org/freedesktop/portal/desktop/session/1_28/webrtc_session557058456
2023/08/10 22:37:15 [INFO] - dbus: option types:3
2023/08/10 22:37:15 [INFO] - dbus: option multiple: 0
2023/08/10 22:37:15 [INFO] - dbus: option persist_mode:1
2023/08/10 22:37:15 [INFO] - wlroots: capturable output: Chimei Innolux Corporation model: 0x140A: id: 44 name: eDP-1
2023/08/10 22:37:15 [DEBUG] - wlroots: output chooser called
2023/08/10 22:37:15 [DEBUG] - wlroots: output chooser called
2023/08/10 22:37:16 [DEBUG] - wlroots: output chooser selects eDP-1
2023/08/10 22:37:16 [INFO] - xdpw: screencast instance 0x55664db234b0 has 1 references
2023/08/10 22:37:16 [INFO] - xdpw: 1 active screencast instances
2023/08/10 22:37:16 [INFO] - wlroots: output: eDP-1
2023/08/10 22:37:16 [INFO] - dbus: session closed
2023/08/10 22:37:16 [DEBUG] - dbus: destroying session 0x55664db0db00
2023/08/10 22:37:16 [DEBUG] - xdpw: screencast instance 0x55664db234b0 now has 0 references
2023/08/10 22:37:16 [DEBUG] - xdpw: destroying cast instance
What's really interesting is that Chromium's "share entire screen" preview works - I can see the small screen there after selecting it. But then, once I start the screenshare, nothing - just like on Firefox.
Finally found the culprit: an assertion is failing over on PipeWire:
'loop->recurse > 0' failed at ../pipewire/src/pipewire/thread-loop.c:426 pw_thread_loop_wait()
I also found that OBS can screenshare just fine. It seems like jumping from the "preview" to the actual screenshare on firefox/chromium is what causes the error. I filed a pipewire issue to see if the failed assertion can get us anywhere: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/3428
Ah, this is fixed in Firefox Beta 117.0b8, so it was clearly a problem on their side. I initially thought it was https://bugzilla.mozilla.org/show_bug.cgi?id=1841851, but updating regular firefox to 116.0.3 did not fix it. Either way, apologies for the noise, I was just frantically trying to debug the breakage :)
Nice. Glad you got it sorted.
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@mvdan You should be screensharing when running the script. E.g. After correcting the above, if I visit https://webrtc.github.io/samples/src/content/getusermedia/getdisplaymedia/ in firefox, start a screenshare, accept the browser permissions, and complete output selection, I get the following output from the script:
gojq script output
{ "firefox": { "formats": [ { "format": "BGRA", "modifiers": [ "0x0000000000000000", "0x0100000000000001", "0x0100000000000002", "0x0100000000000006", "0x0100000000000007", "0x0100000000000008", "0x00ffffffffffffff" ] }, { "format": "RGBA", "modifiers": [ "0x0000000000000000", "0x0100000000000001", "0x0100000000000002", "0x0100000000000006", "0x0100000000000007", "0x0100000000000008", "0x00ffffffffffffff" ] }, { "format": "BGRx", "modifiers": [ "0x0000000000000000", "0x0100000000000001", "0x0100000000000002", "0x0100000000000006", "0x0100000000000007", "0x0100000000000008", "0x00ffffffffffffff" ] } ], "id": 59, "type": "PipeWire:Interface:Node" }, "xdg-desktop-portal-wlr": { "formats": [ { "format": "BGRx", "modifiers": [ "0x0100000000000002" ] }, { "format": "BGRx", "modifiers": [ "0x0000000000000000", "0x0100000000000001", "0x0100000000000002" ] } ], "id": 58, "type": "PipeWire:Interface:Node" } }BGRx+0x01000000000002 is I915_FORMAT_MOD_Y_TILED and supported by both applications. The xpdw formats are those offered by sway, the firefox ones are those currently supported in webrtc on my platform.