On 2/19/25 18:17, Snyder, Alexander J wrote:
On Wayland, x11grab won't work because there is no direct access to
the display like in Xorg. Instead, you'll need to use PipeWire and
wf-recorder or obs-v4l2sink.
Solution Using PipeWire (wf-recorder and v4l2loopback)
1. Install required dependencies (if not already installed):
sudo apt install wf-recorder v4l2loopback-utils v4l2loopback-dkms
2. Load the v4l2loopback module (if not already loaded):
sudo modprobe v4l2loopback devices=1 video_nr=10 card_label="Virtual
Camera" exclusive_caps=1
This creates /dev/video10, which you will use as your virtual camera.
3. Capture the second monitor and send it to /dev/video10:
wf-recorder -o HDMI-A-1 -f - | ffmpeg -i - -f v4l2 -vcodec rawvideo
-pix_fmt yuv420p /dev/video10
Replace HDMI-A-1 with your monitor's correct name. Find your available
outputs with:
swaymsg -t get_outputs
I tried swaymsg and got this
$ swaymsg -t get_outputs
00:00:00.040 [swaymsg/main.c:494] Unable to retrieve socket path
I tried to find another way to get the same information. I ended up
trying ls /sys/class/drm and found card1-HDMI_A_1 among the contents of
that folder.
Next I tried the wf-recorder command you said to try. I got the
following and Zoom didn't detect a camera. Do I have something missing?
$ wf-recorder -o HDMI-A-1 -f - | ffmpeg -i - -f v4l2 -vcodec rawvideo
-pix_fmt yuv420p /dev/video10
ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 13 (Ubuntu 13.2.0-23ubuntu3)
configuration: --prefix=/usr --extra-version=3ubuntu5
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
--incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl
--disable-stripping --disable-omx --enable-gnutls --enable-libaom
--enable-libass --enable-libbs2b --enable-libcaca --enable-libcdio
--enable-libcodec2 --enable-libdav1d --enable-libflite
--enable-libfontconfig --enable-libfreetype --enable-libfribidi
--enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz
--enable-libmp3lame --enable-libmysofa --enable-libopenjpeg
--enable-libopenmpt --enable-libopus --enable-librubberband
--enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex
--enable-libtheora --enable-libtwolame --enable-libvidstab
--enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265
--enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal
--enable-opencl --enable-opengl --disable-sndio --enable-libvpl
--disable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883
--enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray
--enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist
--enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264
--enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2
--enable-libplacebo --enable-librav1e --enable-pocketsphinx
--enable-librsvg --enable-libjxl --enable-shared
libavutil 58. 29.100 / 58. 29.100
libavcodec 60. 31.102 / 60. 31.102
libavformat 60. 16.100 / 60. 16.100
libavdevice 60. 3.100 / 60. 3.100
libavfilter 9. 12.100 / 9. 12.100
libswscale 7. 5.100 / 7. 5.100
libswresample 4. 12.100 / 4. 12.100
libpostproc 57. 3.100 / 57. 3.100
compositor doesn't support wlr-screencopy-unstable-v1
[in#0 @ 0x639aee7d2cc0] Error opening input: Invalid data found when
processing input
Error opening input file -.
Error opening input files: Invalid data found when processing input
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