Mortiflix

A motion design studio on your own machine.
Claude makes the video step by step. You approve every stage.

Most "AI video" tools are one prompt and a slot machine. Mortiflix works like a real motion design studio:
a brief, a script, style frames, an animatic, a final, and you review each stage before the next one starts.
You pin a note on the exact spot of a frame or the exact moment of a video. The next version answers every note,
one by one, and shows you what changed.

It's built for one person: you write the briefs, you review every stage, and the studio runs on your machine.
The work is done by Claude through your own Claude Code login or your own Anthropic API key. Mortiflix is
the harness around it: the pipelines, the gates, the review room, and the memory that carries a project across
sessions and days.

 brief ──▶ script ──▶ style frames ──▶ animatic ──▶ build ──▶ final ──▶ delivered
   ▲          ▲            ▲              ▲                     ▲
   └── you ───┴──── you ───┴───── you ────┴──────── you ────────┘
       approve, pin notes, answer questions (the session stops at every gate)

Why it's built this way

• Sessions end at gates. A Claude session works until it has something for you to review, submits it, writes a
  handoff and stops. When you respond, a fresh session picks up from the journal. Waiting on you costs nothing,
  for hours or for days.
• The rules live in code, not in the prompt. Only you can approve a step you review. A submission is refused if
  it doesn't report every error check for its kind of work, or if it doesn't answer each note you left on the last
  version. What you reviewed is copied out of the session's reach, so it can't change afterwards.
• It learns your studio. When you point out a real mistake, the session proposes a new check ("text never
  touches the frame edge"). Approve it once and every future video runs it. Your taste carries across projects in
  TASTE.md.
• Pipelines are folders. A pipeline is a pipeline.json (steps, how each is reviewed, the error checks), a
  PIPELINE.md (the craft), and skills. Anyone can write one: that's the point of open-sourcing it.

Quick start

You need Node 20+ and ffmpeg. For real videos you also need one of:

• Claude Code, logged in (your plan pays), or
• an Anthropic API key (you pay per token).

git clone https://github.com/GTKottman/mortiflix-oss.git && cd mortiflix-oss
npm install
npm link                 # puts `mortiflix` on your PATH (or use: node bin/mortiflix)

mortiflix init           # makes the studio folder (~/Mortiflix), picks a backend it finds, asks for your keys
mortiflix demo           # a full walk-through with placeholder work: free, no Claude needed

Then either:

A. In the terminal

mortiflix new explainer          # asks the brief's questions
mortiflix run                    # sessions run until something waits on you
mortiflix review                 # read the note, answer questions, pin notes, approve or ask for changes
mortiflix run                    # ...and so on until it's delivered

B. In the browser

mortiflix serve                  # http://127.0.0.1:4646

The web studio shows what's waiting on you, a live log of what Claude is doing, and the review room: click a frame
to pin a note, pause a video to note a moment, comment on a paragraph of the script, answer the session's questions,
and approve. Sessions start by themselves while serve runs. To use it from another device, run
mortiflix serve --host 0.0.0.0: you then get a private link with an access token (put it behind HTTPS if it leaves
your network).

Backends

Pick one with mortiflix init --backend …, mortiflix config backend …, or Settings in the web studio.

Your keys

Mortiflix runs on your own accounts: there's nothing to sign up for. mortiflix init asks for your keys, and
mortiflix keys changes them any time (Settings › Keys in the web studio does the same):

Anthropic API key   only for the anthropic-api backend (Claude Code uses your own login)
ElevenLabs API key  only for ElevenLabs narration, sound effects and music
Other keys          anything a pipeline's tools read from the environment, e.g. GEMINI_API_KEY

Typing is hidden, each key is checked with a free API call before it's saved, and they're written to the studio
folder only (secrets.json and session.env, mode 600). If a project needs a key you haven't added, it asks
before it starts (mortiflix new, or the web studio's Start button) instead of failing halfway through.
For scripts: echo "$KEY" | mortiflix keys set elevenlabs.

What it can make today

They build in Remotion (React video) and check every render with ffmpeg (qc.mjs:
format, black or frozen frames, loudness, a frame sheet Claude has to look at). Remotion has its own license: free for individuals and small teams, a company
license above that. Check it for your case.

Narration

Pick a voice in Settings › Narration (or mortiflix voice):

• ElevenLabs: connect your key and choose from your voices, the default voices or the Voice Library, with
  Eleven v4 by default and every option the API offers (models, stability and similarity, language, text
  normalization, pronunciation dictionaries, audio format, data-residency servers), plus sound effects and music
  beds. Settings shows your plan, credits, and whether you may use the audio commercially (the free plan doesn't).
• This computer: Qwen3-TTS (open, Apache-2.0) through ComfyUI on your graphics card: free and private. Mortiflix
  checks your GPU and offers it when it fits (4 GB for the 0.6B voice, 8 GB for the 1.7B voice with delivery
  instructions).
• None: on-screen text and music.

Every line is checked by speech to text and retaken if words go missing; word timings drive the animation.
Details: docs/VOICE.md.

Make your own pipeline

cp -r pipelines/logo-sting ~/Mortiflix/pipelines/my-pipeline   # the studio's own pipelines override built-ins
$EDITOR ~/Mortiflix/pipelines/my-pipeline/pipeline.json
mortiflix pipelines                                             # validates it
mortiflix new my-pipeline --backend demo                        # walk its gates for free

Read docs/PIPELINES.md. This is where help is most wanted: music videos, product films,
data stories, kinetic type, 3D in Blender, captions for existing footage. If you can describe how a good studio
makes it, it can be a pipeline.

How it works

• OVERVIEW.html: the whole project on one page, with UML diagrams (download it and open it in a browser)
• docs/ARCHITECTURE.md: the runner, the bridge (mfx), the gates, the session brief, the backends
• docs/PIPELINES.md: the pipeline format and how to write a good one
• harness/GATES.md: the protocol every session follows
• docs/SECURITY.md: what a session can and can't reach, and the web server's guards
• docs/COMPUTE.md: where the tokens, time and disk go, measured on a real project
• docs/VOICE.md: narration with ElevenLabs or on your own GPU, and every option

Where it came from

Mortiflix began as a hosted motion design studio, where every video was made stage by stage behind the same kind of
gates, with clients approving each one. This repository is that process, boiled down to one machine and opened up,
so it can be improved by more people than one studio.

Not here yet (from the hosted studio, contributions welcome): a recording booth for your own narration, the music
system (compose in Strudel, produce in openDAW), workflow preferences learned from your pins, redo rounds on a
delivered video, share links, and more pipelines (codebase explainers, 3D music videos, real estate films).

Contributing

See CONTRIBUTING.md. Tests run in about a second (npm test) and never call the network.

License

AGPL-3.0. If you run a modified Mortiflix as a service for others, share your changes.
The bundled fonts (Sora, Unbounded) are under the SIL Open Font License (web/fonts/).