Miraiclip is a developer library for building a video editor that runs in a browser—not a finished editor application. Its headless core models projects and editing operations; a separate renderer handles playback and media output. That split lets developers create their own interface, but means they must also build the user experience and account for browser and codec support.
What Miraiclip provides—and what you still build
The project describes Miraiclip as a framework-agnostic library. You can build an interface with your preferred framework or plain JavaScript, while Miraiclip provides infrastructure for representing and changing an edit. It does not arrive as a ready-to-use timeline UI or consumer video editor. Miraiclip overview
The architecture separates two jobs:
@miraiclip/core: headless project state and editing commands. It does not decode media.@miraiclip/renderer: browser-facing playback and rendering, documented around WebCodecs, PixiJS compositing, and Web Audio scheduling. Rendering guide
This separation is useful if you want control over the editor experience or need to integrate editing into an existing product. It also means the interface, media workflow, and integration work remain your responsibility.
How projects and edits are represented
The quickstart models a project as a Zustand-backed store containing assets, tracks, and clips. Its examples create a composition, register media metadata, add tracks and clips, and then dispatch editing commands such as moving or splitting a clip. The examples express timeline positions and durations in microseconds. Quickstart
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Rather than changing timeline state through arbitrary UI mutations, an application dispatches commands. The documentation describes commands as deterministic, undoable, and serializable. Related changes can be grouped in a transaction so they appear as one history entry. Project changes are emitted as granular patches, and project data can be serialized to JSON for saving and later restoration.
In practical terms, your UI needs to translate user actions—such as dragging a clip or pressing Undo—into the appropriate project operations, then reflect the resulting state and patches. Persistence is based on project data; the documentation does not make the core itself a media decoder or a complete storage service.
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Browser playback and media compatibility
The renderer relies on browser capabilities, including WebCodecs and WebGL; the rendering guide also describes Web Audio. Miraiclip’s compatibility page lists these browser minimums for its renderer: compatibility documentation
| Browser | Documented minimum |
|---|---|
| Chrome and Edge | 94 or later |
| Safari | 16.4 or later |
| Firefox | 130 or later |
These are the project’s documented minimums, not an independent compatibility test. The guide recommends checking runtime support before enabling the rendering pipeline. A browser meeting the listed version alone does not guarantee that every media file will play: decoding depends on the combination of container, codec, browser, and platform support available through WebCodecs.
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Export formats and server-side rendering
The documentation describes browser export paths for MP4 using H.264 video and AAC audio, and WebM using VP9 video and Opus audio. The MP4 path requires a browser with the relevant encoders; codec availability therefore matters as much as the file extension. Compatibility documentation
For server-side export, Miraiclip’s guide describes launching headless Chrome from Node.js. It recommends real Chrome for MP4 in its setup because free Chromium builds may lack the proprietary encoders used by that route; the guide says WebM works more broadly. This is a description of Miraiclip’s documented setup, not a guarantee about every Chromium distribution or deployment environment. Server-side export guide
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Before choosing an export path, verify that the target runtime has the encoders and browser APIs your workflow needs, and test representative input files. A container listed in the documentation does not by itself establish that all files in that container are decodable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.MCP integration: editing through an agent client
Miraiclip documents an MCP server that exposes project operations—including editing commands, previews, undo/redo, and export—to a client that supports MCP. The server guide describes a stdio-based integration. For server export, it uses headless Chrome from Node.js. MCP server guide
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This adds an agent-accessible route to the editing engine; it does not supply a finished editor for human users. You still need to build or provide the client experience and handle the project’s browser, media, and export requirements.
Maturity and adoption considerations
Miraiclip’s quickstart labels the project pre-1.0 and warns that APIs may change between minor versions. Treat adoption as a technical evaluation: inspect the current package and documentation, pin versions, and validate the operations and media formats your product depends on before building a critical workflow around them. Quickstart
The npm page for @miraiclip/core listed version 0.1.0 and an MIT license at the time it was checked; package versions and publication details can change, so confirm the current registry listing before relying on those specifics. @miraiclip/core on npm
Quick Recap
Who should consider Miraiclip?
- Consider it if you are a developer building a custom browser-based editor and want command-driven, serializable project state with undo/redo infrastructure.
- Plan additional work if you need a polished editor UI, a persistence layer, or a production media workflow: the library is an engine, not a complete application.
- Validate first if your users need broad device support, particular codecs, or MP4 server export. Browser APIs and encoder availability can determine whether the intended workflow works.
- Be cautious about long-lived integrations because the project is pre-1.0 and documents possible minor-version API changes.
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