Blackscreen only on Wayland Gnome 3.36.2

[jvellojin]

On Gnome Wayland 3.36.2, after installing the obs-gnome-screencast I having only a black screen. The screen sharing on Gnome settings is activated and gstreamer pipewire elements are installed, as suggested in the instructions. I am on Arch.

[fzwoch]

Did you check if the log gives a hint of where it fails?

[jvellojin]

Did you check if the log gives a hint of where it fails?

Yes, it doesn't show anything to be worried, although the issue is present only on my desktop PC. I have not been able to reproduce it in my laptop.

My desktop is an i7 6700k with 16GB ram and intel gpu HD530, while my laptop is a Thinkpad X1 carbon 6th with 16GB ram and intel gpu HD620.

Maybe is a driver issue (or a missing package that is installed in the laptop, but not in the desktop...).

[fzwoch]

In theory it should not matter what GPU is being used. The API is supposed to work with X11 as well as wayland. Even a software renderer should work I believe.

You can try to add GStreamer debbuging in case the plugin makes it that far. E.g.

GST_DEBUG=3 obs

You can also try higher numbers to get more information. Perhaps this reveals a hint.

[jvellojin]

In theory it should not matter what GPU is being used. The API is supposed to work with X11 as well as wayland. Even a software renderer should work I believe.

You can try to add GStreamer debbuging in case the plugin makes it that far. E.g.

GST_DEBUG=3 obs

You can also try higher numbers to get more information. Perhaps this reveals a hint.

Below is the original log file from OBS. Maybe I'm missing something...
How can I run the suggested test with GST_DEBUG=3 obs?

`16:41:18.424: CPU Name: Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
16:41:18.424: CPU Speed: 2170.324MHz
16:41:18.425: Physical Cores: 4, Logical Cores: 8
16:41:18.425: Physical Memory: 15459MB Total, 13716MB Free
16:41:18.425: Kernel Version: Linux 5.7.3-arch1-1
16:41:18.425: Distribution: "Arch Linux" Unknown
16:41:18.426: Window System: X11.0, Vendor: The X.Org Foundation, Version: 1.20.8
16:41:18.428: Portable mode: false
16:41:18.508: OBS 25.0.8-1 (linux)
16:41:18.508: ---------------------------------
16:41:18.509: ---------------------------------
16:41:18.509: audio settings reset:
16:41:18.509: samples per sec: 44100
16:41:18.509: speakers: 2
16:41:18.515: ---------------------------------
16:41:18.515: Initializing OpenGL...
16:41:18.585: Loading up OpenGL on adapter Intel Mesa Intel(R) HD Graphics 530 (SKL GT2)
16:41:18.585: OpenGL loaded successfully, version 4.6 (Core Profile) Mesa 20.1.1, shading language 4.60
16:41:18.629: ---------------------------------
16:41:18.629: video settings reset:
16:41:18.629: base resolution: 1920x1080
16:41:18.629: output resolution: 1280x720
16:41:18.629: downscale filter: Bicubic
16:41:18.629: fps: 30/1
16:41:18.629: format: NV12
16:41:18.629: YUV mode: 601/Partial
16:41:18.629: NV12 texture support not available
16:41:18.632: Audio monitoring device:
16:41:18.632: name: Por defecto
16:41:18.632: id: default
16:41:18.632: ---------------------------------
16:41:18.638: Failed to load 'en-US' text for module: 'decklink-ouput-ui.so'
16:41:18.732: A DeckLink iterator could not be created. The DeckLink drivers may not be installed
16:41:18.732: No blackmagic support
16:41:18.769: os_dlopen(libnvidia-encode.so.1->libnvidia-encode.so.1): libnvidia-encode.so.1: no se puede abrir el fichero del objeto compartido: No existe el fichero o el directorio
16:41:18.769:
16:41:18.769: FFMPEG VAAPI supported
16:41:18.799: VLC found, VLC video source enabled
16:41:18.799: ---------------------------------
16:41:18.799: Loaded Modules:
16:41:18.799: vlc-video.so
16:41:18.799: text-freetype2.so
16:41:18.799: rtmp-services.so
16:41:18.799: obs-x264.so
16:41:18.799: obs-transitions.so
16:41:18.799: obs-outputs.so
16:41:18.799: obs-libfdk.so
16:41:18.799: obs-filters.so
16:41:18.799: obs-ffmpeg.so
16:41:18.799: linux-v4l2.so
16:41:18.799: linux-pulseaudio.so
16:41:18.799: linux-jack.so
16:41:18.799: linux-decklink.so
16:41:18.799: linux-capture.so
16:41:18.799: linux-alsa.so
16:41:18.799: image-source.so
16:41:18.799: gnome-mutter-screencast.so
16:41:18.799: frontend-tools.so
16:41:18.799: decklink-ouput-ui.so
16:41:18.799: ---------------------------------
16:41:18.799: ==== Startup complete ===============================================
16:41:18.800: Service '' not found
16:41:18.801: No scene file found, creating default scene
16:41:18.801: All scene data cleared
16:41:18.801: ------------------------------------------------
16:41:18.805: pulse-input: Server name: 'pulseaudio 13.0'
16:41:18.805: pulse-input: Audio format: s16le, 44100 Hz, 2 channels
16:41:18.805: pulse-input: Started recording from 'alsa_output.pci-0000_00_1f.3.analog-stereo.monitor'
16:41:18.807: pulse-input: Server name: 'pulseaudio 13.0'
16:41:18.807: pulse-input: Audio format: s16le, 44100 Hz, 1 channels
16:41:18.807: pulse-input: Started recording from 'alsa_input.usb-Microsoft_Microsoft___LifeCam_HD-3000-02.mono-fallback'
16:41:18.807: Switched to scene 'Escena'
16:41:18.807: Failed to glob scene collections
16:41:19.469: [rtmp-services plugin] Successfully updated file 'services.json' (version 133)
16:41:19.469: [rtmp-services plugin] Successfully updated package (version 133)
16:41:19.595: adding 46 milliseconds of audio buffering, total audio buffering is now 46 milliseconds (source: Mic/Aux)
16:41:19.595:
16:41:29.315:
16:41:29.315: ==== Auto-config wizard testing commencing ======

16:41:29.365: ---------------------------------
16:41:29.365: video settings reset:
16:41:29.365: base resolution: 1920x1080
16:41:29.365: output resolution: 1920x1080
16:41:29.365: downscale filter: Bicubic
16:41:29.365: fps: 30/1
16:41:29.365: format: NV12
16:41:29.365: YUV mode: 601/Partial
16:41:29.365: NV12 texture support not available
16:41:29.369: ---------------------------------
16:41:29.369: [x264 encoder: 'test_x264'] preset: veryfast
16:41:29.369: [x264 encoder: 'test_x264'] profile: high
16:41:29.370: [x264 encoder: 'test_x264'] settings:
16:41:29.370: rate_control: CRF
16:41:29.370: bitrate: 0
16:41:29.370: buffer size: 0
16:41:29.370: crf: 20
16:41:29.370: fps_num: 30
16:41:29.370: fps_den: 1
16:41:29.370: width: 1920
16:41:29.370: height: 1080
16:41:29.370: keyint: 250
16:41:29.370:
16:41:29.379: ---------------------------------
16:41:29.380: [FFmpeg aac encoder: 'test_aac'] bitrate: 32, channels: 2, channel_layout: 3
16:41:29.380:
16:41:34.387: Output 'null': stopping
16:41:34.388: Output 'null': Total frames output: 123
16:41:34.388: Output 'null': Total drawn frames: 150
16:41:34.536: ---------------------------------
16:41:34.536: video settings reset:
16:41:34.536: base resolution: 1920x1080
16:41:34.536: output resolution: 1280x720
16:41:34.536: downscale filter: Bicubic
16:41:34.536: fps: 30/1
16:41:34.536: format: NV12
16:41:34.536: YUV mode: 601/Partial
16:41:34.536: NV12 texture support not available
16:41:34.537: ---------------------------------
16:41:34.537: [x264 encoder: 'test_x264'] preset: veryfast
16:41:34.537: [x264 encoder: 'test_x264'] profile: high
16:41:34.537: [x264 encoder: 'test_x264'] settings:
16:41:34.537: rate_control: CRF
16:41:34.537: bitrate: 0
16:41:34.537: buffer size: 0
16:41:34.537: crf: 20
16:41:34.537: fps_num: 30
16:41:34.537: fps_den: 1
16:41:34.537: width: 1280
16:41:34.537: height: 720
16:41:34.537: keyint: 250
16:41:34.537:
16:41:34.540: ---------------------------------
16:41:34.540: [FFmpeg aac encoder: 'test_aac'] bitrate: 32, channels: 2, channel_layout: 3
16:41:34.540:
16:41:39.541: Output 'null': stopping
16:41:39.541: Output 'null': Total frames output: 122
16:41:39.541: Output 'null': Total drawn frames: 150
16:41:39.637: ---------------------------------
16:41:39.637: video settings reset:
16:41:39.637: base resolution: 1920x1080
16:41:39.637: output resolution: 1148x646
16:41:39.637: downscale filter: Bicubic
16:41:39.637: fps: 30/1
16:41:39.637: format: NV12
16:41:39.637: YUV mode: 601/Partial
16:41:39.637: NV12 texture support not available
16:41:39.639: ---------------------------------
16:41:39.639: [x264 encoder: 'test_x264'] preset: veryfast
16:41:39.639: [x264 encoder: 'test_x264'] profile: high
16:41:39.639: [x264 encoder: 'test_x264'] settings:
16:41:39.639: rate_control: CRF
16:41:39.639: bitrate: 0
16:41:39.639: buffer size: 0
16:41:39.639: crf: 20
16:41:39.639: fps_num: 30
16:41:39.639: fps_den: 1
16:41:39.639: width: 1148
16:41:39.639: height: 646
16:41:39.639: keyint: 250
16:41:39.639:
16:41:39.642: ---------------------------------
16:41:39.642: [FFmpeg aac encoder: 'test_aac'] bitrate: 32, channels: 2, channel_layout: 3
16:41:39.642:
16:41:44.642: Output 'null': stopping
16:41:44.642: Output 'null': Total frames output: 122
16:41:44.642: Output 'null': Total drawn frames: 150
16:41:44.740: ---------------------------------
16:41:44.740: video settings reset:
16:41:44.740: base resolution: 1920x1080
16:41:44.740: output resolution: 1280x720
16:41:44.740: downscale filter: Bicubic
16:41:44.740: fps: 30/1
16:41:44.740: format: NV12
16:41:44.740: YUV mode: 601/Partial
16:41:44.740: NV12 texture support not available
16:42:21.010: ---------------------------------
16:42:21.010: video settings reset:
16:42:21.010: base resolution: 1920x1080
16:42:21.010: output resolution: 1920x1080
16:42:21.010: downscale filter: Bicubic
16:42:21.010: fps: 30/1
16:42:21.010: format: NV12
16:42:21.010: YUV mode: 601/Partial
16:42:21.010: NV12 texture support not available
16:42:21.017:
16:42:21.017: ==== Auto-config wizard testing stopping ========

16:42:29.366: User added source 'GNOME Mutter Screen Cast' (gnome-mutter-screencast-source) to scene 'Escena'`

[fzwoch]

Run it from a terminal.

[jvellojin]

Run it from a terminal.

I have been able to fix it. The plugin was installed using an AUR PKGBUILD. Instead of that, I extracted the file from master release to /usr/lib/obs-plugins and everything is working now.
Thank you for your time and thank you for the plugin. This issue can be closed now.

[fzwoch]

Glad to hear that it works 👍