Let people pick which audio output gets recorded - #210
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Some clips arrive with the microphone intact but part or all of the PC audio missing, most often Discord's voice. System audio is captured as a WASAPI loopback on the default *console* render endpoint, while Windows keeps a second default for communications that voice apps follow. When those two point at different devices, Discord plays somewhere we never listened. Add an `audio.output_device` setting with a picker in the settings app next to the microphone one: the active output endpoints on Windows, the PipeWire sinks on Linux, and on macOS a hint, since ScreenCaptureKit's loopback always follows the system output and takes no device. On Windows, also open a second loopback on the communications endpoint whenever it differs from the console one and the user has not named an output themselves, so the common case fixes itself for people who never open the settings. Both defaults are logged at startup, which is the diagnostic the reports were missing. A configured output that has gone away now warns and falls back to the default instead of leaving the clips silent. Microphones deliberately keep the hard error: quietly recording a different mic than the one that was picked is not a friendly failure.
A failed spawn of the communications-endpoint stream was propagating out of startup, which both contradicts the stream's optional status and detaches the system capture that was spawned a few lines above it. Log it and carry on instead. Also prefer an exact endpoint-name match over a merely containing one, so a device called "Headset" can no longer resolve onto "Headset Earphone" and sum the same audio into the mixer twice.
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This repository does not receive automatic reviews because it has fewer than 10 stars. ⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Advanced Run ID: 📝 WalkthroughWalkthroughThe change adds persisted system-audio output selection, platform-specific output discovery, fallback handling, and Windows communications-endpoint capture. Settings expose the picker where supported, while recording uses the configured output across Linux, Windows, and macOS. ChangesAudio output selection
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature · Severity of issue fixed: Medium Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant Settings UI
participant Config
participant Output Discovery
participant Recording
participant WASAPI
Settings UI->>Output Discovery: enumerate system-audio outputs
Output Discovery-->>Settings UI: return output device names
Settings UI->>Config: persist selected output device
Recording->>Config: read configured output device
Recording->>WASAPI: open configured render endpoint
WASAPI-->>Recording: provide system-audio stream
Merge Risk: 🟠 High · up to The Windows path can omit communications audio on systems with distinct endpoints sharing a display name, so the recording behavior should be corrected before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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🧪 Generate unit tests (beta)
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In `@crates/capture/src/windows/wasapi_audio.rs`:
- Around line 104-105: Update default_render_endpoints and its callers to
preserve endpoint identity using endpoint IDs or IMMDevice handles instead of
relying on friendly names. Ensure the communications stream is compared and
opened by endpoint identity while retaining friendly names for logging, and add
coverage for distinct endpoint IDs that share a friendly name.
In `@crates/config/src/devices.rs`:
- Line 210: Update the media-class check around media_class.starts_with(class)
to accept only an exact class match or a class followed by “/”, rejecting
near-prefix values such as Audio/Sinkhole. Add a focused near-match test
covering this boundary.
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📒 Files selected for processing (8)
crates/app/src/main.rscrates/capture/src/macos/audio.rscrates/capture/src/windows/mod.rscrates/capture/src/windows/wasapi_audio.rscrates/config/src/devices.rscrates/config/src/lib.rscrates/config/src/schema.rscrates/settings/src/main.rs
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Windows gives two endpoints from identical hardware the same friendly name, so comparing names could call a genuinely separate communications default "the same device" and skip its stream. Compare endpoint IDs instead, and let the resolver match one, so the stream opens the exact endpoint Windows named. Also tighten the PipeWire media-class filter: it matched by prefix, so a hypothetical "Audio/Sinkhole" counted as a sink. Only the class itself and its "/"-suffixed variants do now.
This was referenced Sep 12, 2026
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Closes #209.
Clips have been arriving with the microphone intact but part or all of the PC audio missing, most often Discord's voice. System audio is captured as a WASAPI loopback on the default console render endpoint, while Windows keeps a second default for communications that voice apps follow. When those two point at different devices, Discord plays on an endpoint we never listened to. The "no system sound at all" reports are the same mechanism with the roles swapped: the console default is an endpoint nothing actually plays on.
What changed
A system-audio device picker, in the settings app next to the microphone one, backed by a new
audio.output_deviceconfig key. It lists the active render endpoints on Windows and the PipeWire sinks on Linux; on macOS it gives way to a hint, since ScreenCaptureKit's loopback always follows the system output and takes no device at all. Empty stays the default, as with the microphone.A second loopback on the communications endpoint (Windows), opened whenever it differs from the console default and the user has not named an output themselves, summed into the same mixer. That fixes the reported case for people who never open the settings; an explicit pick is left exactly as picked. Both defaults are logged at startup, which is the diagnostic these reports were missing.
Softer failure for a device that has gone away. A configured output that no longer exists warns, lists what does exist, and falls back to the system default rather than leaving the clips silent. Microphones keep the hard error on purpose: quietly recording a different mic than the one that was picked is not a friendly failure. An exact name match now wins over a substring one, so "Headset" cannot resolve onto "Headset Earphone".
The macOS backend no longer errors when a config carries an
output_devicefrom another machine; it warns and ignores it, so a synced config cannot cost a Mac its system audio.Internally, the microphone and system-audio fields now share one
device_pickerhelper in the settings app, and the Windows endpoint walk and the Linuxpw-dumpparse are each parameterized instead of duplicated.Testing
cargo build --workspace,cargo clippy --workspace --all-targets -- -D warnings,cargo fmt --all --check,cargo test --workspaceall green, pluscargo clippy --target x86_64-pc-windows-msvc -p rewynd-capture.output_device, and thepw-dumpsink filtering.Summary by CodeRabbit
New Features
Bug Fixes