[calvin-archastro]

Basic OBS-style recording in Splice, as a Record tab beside Edit and Story.

What it does

• Sources: a display, a window or part of a display (with the pointer), a camera (Continuity Camera too), a microphone, and the sound the Mac plays. All are live in the tab, with level meters, and Splice keeps its own windows out of the shot.
• A file per source, like OBS's Source Record plugin: screen.mp4, camera.mp4, microphone.m4a and system.m4a go in one folder per take. They all start at the same moment on one clock.
• Scene: Screen, Bubble (corner, size, round or square), Side by side, or Camera. A take lands on the timeline as layers in those places. The scene is an edit, not baked in, so it can still be changed afterwards.
• Files: H.264 or HEVC at constant quality (Good, High, Best), 30 or 60 fps, and the screen at full size, 4K, 1440p or 1080p.
• Pause and resume. Files are written in one-second fragments; if the recorder dies, what it wrote comes in.
• Each project keeps its setup; "Make this my default" sets the one new projects start with.
• splice ctl record: sources, setup …, start, pause, resume, stop --wait, status.

How

• crates/splice-app/capture/main.swift is a small Swift helper using ScreenCaptureKit (screen and system audio) and AVFoundation (camera, mic, AVAssetWriter). build.rs compiles it with swiftc, and the binary carries it.
• Splice talks to it over stdin/stdout: JSON events plus small BGRA preview frames.
• The scene layouts are plain maths in splice-core/src/studio.rs, with tests.

Tested by hand (release build, run from the terminal):

• Display capture plus system audio at 1440p.
• Window capture: its sound comes from the whole display, since a window filter only hears its own app.
• The mic.
• Pause/resume: a sound played while paused is absent.
• Killing the helper mid-take: the partial take comes in and the sources restart.
• Two takes stacked on the timeline.

Not yet tested: the camera (waiting on a macOS permission prompt) and therefore the bubble and side-by-side placement with live footage. The layout maths is unit-tested.

🤖 Generated with Claude Code