Composer

Run the video Composer locally.

Composer is Flowcorder's local timeline for trimming captures, adding camera movement, applying frames and backgrounds, and exporting demo videos.

Local First

Composer ships with the CLI. flowcorder open starts a local sidecar server, serves the Studio UI, reads captures from .flowcorder/, and renders with local FFmpeg. Captures do not need to be uploaded to a hosted editor.

flowcorder open

# Opens local Studio with:
# - flow list
# - live capture preview
# - capture library
# - Composer timeline
# - render presets
# - local export jobs

Capture library

Browse .flowcorder captures with recording.webm, steps.json, cursor-track.json, and final.png.

Timeline

Trim a capture, reorder scenes, and adjust pacing without rewriting the flow.

Camera

Add zooms, focus moves, and baseline camera motion based on UI elements or manual regions.

Voiceover

Generate per-beat narration from a script with ElevenLabs, OpenAI, or Descript voices, synced to the timeline.

Export

Render landscape, vertical, and social presets locally through the compose engine.

CLI Pairing

Everything Composer does visually should have a matching CLI path so teams can render demos in CI or from an agent-generated script.

flowcorder run onboarding
flowcorder compose onboarding-1778352213555 --preset landscape-1080p
flowcorder compose onboarding-1778352213555 --preset vertical-1080p

Voiceover

Add narration to a composition by authoring beats in your composition file. Flowcorder generates per-beat audio with your chosen provider, caches it locally, and concatenates it into a single narration track synced to the timeline. Supported providers: elevenlabs, openai, and descript.

flowcorder voiceover validate composition.ts
flowcorder voiceover generate composition.ts
flowcorder compose run composition.ts --generate-voiceover