5100d78aa8
BUG-2 (HIGH): SHM Buffer event caused permanent hang In the ZwlrScreencopyFrameV1 dispatcher, receiving a SHM Buffer event left in_flight_surface stuck at AllocQueued forever, preventing queue_alloc_frame() from requesting new frames. Fix: treat Buffer as a metadata offer (v3 protocol), wait for BufferDone to decide failure, and add AllocQueued state guard to LinuxDmabuf handler. BUG-3 (MEDIUM): Portal backend picked wrong GPU on multi-GPU systems state_portal.rs hardcoded /dev/dri/renderD128 then renderD129, which selects the wrong GPU when PipeWire uses a different device. Fix: extract find_drm_render_nodes() as shared utility; defer DRM device selection to first PipeWire frame; test each candidate with av_hwframe_transfer_data to find the GPU that can actually import the DMA-BUF frame. BUG-4 (LOW): VAAPI device context created twice unnecessarily try_finalize_output() created an AvHwDevCtx stored in EverythingButFmt, but negotiate_format() discarded it (_hw_device_ctx) and EncState::new created a new one. Fix: thread the existing hw_device_ctx through negotiate_format() and create_encoder() to EncState::new() which reuses it when provided.
wl-webrtc
Wayland screen capture and encoding tool.
Prerequisites
- Rust toolchain (1.70+):
rustup default stable - FFmpeg 6.0+ dev libraries with VAAPI support:
- Arch:
pacman -S ffmpeg - Ubuntu/Debian:
apt install libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libva-dev - Fedora:
dnf install ffmpeg-devel libva-devel
- Arch:
- Wayland dev libraries:
- Arch:
pacman -S wayland-protocols - Ubuntu/Debian:
apt install libwayland-dev wayland-protocols - Fedora:
dnf install wayland-devel wayland-protocols-devel
- Arch:
- DRM dev libraries:
- Arch:
pacman -S libdrm - Ubuntu/Debian:
apt install libdrm-dev - Fedora:
dnf install libdrm-devel
- Arch:
Build
cargo build --release
Run
# Basic capture to file
wl-webrtc --output output.mp4
# With custom FPS and bitrate
wl-webrtc --output output.mp4 --fps 60 --bitrate 8000000
# Specify DRM device for hardware encoding
wl-webrtc --output output.mp4 --drm-device /dev/dri/renderD128
# Verbose mode
wl-webrtc --output output.mp4 -v
CLI Arguments
| Argument | Default | Description |
|---|---|---|
-o, --output |
(required) | Output file path (e.g., output.mp4) |
--output-name |
auto | Wayland output name to capture |
--fps |
30 | Target frames per second |
--codec |
h264 | Video codec (h264 only for MVP) |
--hw-accel |
vaapi | Hardware acceleration method |
--drm-device |
auto | DRM render device path |
--bitrate |
auto | Target bitrate in bps |
--gop-size |
auto | Group of Pictures size |
-v, --verbose |
false | Enable verbose logging |
--port |
0 | WebTransport server port (unused in MVP) |