Concat

jub0t

9.1k stars1.1k forksRustAGPL-3.0

ffmpegfree-video-editormodel-context-protocolnon-linear-editoroffline-firstopen-source-video-editorself-hostedvideo-editingvideo-editing-automationvideo-editing-software

A free cross-platform CapCut replacement for editing and exporting videos locally without an account or watermark.

Unlike cloud-based editors, Concat keeps footage on your disk and runs captioning, voices, and cutouts locally after model downloads. Drop in footage, arrange and animate clips on timelines, then export finished video. It is beta software with desktop, Android, and sideloaded iOS builds.

For Video creators editing offline moving away from CapCut restrictions, and developers automating video edits

Desktop appv0.2.7

Use cases

Edit short-form videos offline without accounts or watermarks
Create captions for spoken footage with local Whisper models
Add narration from written scripts with local voices or cloning
Remove footage backgrounds for people or objects
Animate clips and effects with editable keyframes

Key features

Local-first editing: No uploads, account, subscription, or watermark
Auto-captions: Local Whisper models create styled timeline captions
Text-to-speech and voice cloning: Clone voices from a few recording seconds
Background removal: Masks people, objects, or hand-painted selections
Keyframe animation: Position, scale, rotation, opacity, volume, and effects
Effects and transitions: 100 GPU-rendered effects, filters, and transitions

Under the hood

4 parts

Edits are serializable commands against a headless project engine, while window-only state such as selection and zoom stays outside the document. Gestures preview against a cloned project and commit as one command, making undo operate on the completed gesture.

src/crates/concat/src/studio.rs; src/crates/concat-project/src/lib.rs

Project engine
Owns the document model, serializable commands, compatibility reader, writer, and undo stack.
src/crates/concat-project/src/lib.rs
Studio state
Publishes engine edits and window state into the Slint interface.
src/crates/concat/src/studio.rs
Export engine
Flattens timelines, resolves transitions, composites video, and plans audio rendering.
src/crates/concat-export/src/lib.rs
Effect catalogue
Loads built-in and user effect packages for FFmpeg or GPU shader backends.
src/crates/concat-effects/src/lib.rs

Built with

RustSlintFFmpeg via ffmpeg-the-third 6wgpu 30Serde 1whisper.cpp via whisper-rsONNX Runtime via ort 2.0.0-rc.13Clap 4

Generated 2 days ago

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