Trackdub

A local-first, editorial-grade AI dubbing workstation for Windows, macOS, and Linux.

CI · Docs · Investor Brief · Apache-2.0 License

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Trackdub is a cross-platform desktop application and reusable inference engine that automates the full speech dubbing pipeline: language detection, speech recognition (ASR), translation, text-to-speech (TTS), timing reconciliation, and audio export.

The product philosophy is simple: a reliable workstation where every pipeline stage produces durable artifacts, users can inspect and edit intermediate results, and the UI tells the truth about what the model actually did.

This repository is the public core of Trackdub: the engine, SDK, CLI, pipeline, inference runtime, media processing, licensing mechanisms, tooling, and tests. The proprietary desktop product lives in a separate private repository.

Why Trackdub

AI dubbing today is either a black-box cloud service that ships raw media off-device with limited editability, or a fragmented collection of Python scripts and Conda environments that require technical expertise to assemble. Neither is suitable for professional editorial workflows.

Trackdub is built for the gap between them: a local-first, stage-aware, editable dubbing workstation that keeps content on the user's machine and routes to cloud providers only with explicit consent and disclosure.

Key differentiators

• Local-first by default. Media and inference run on the user's hardware. Cloud lanes exist but are gated by explicit consent; nothing leaves the machine silently.
• Stage-aware workflow. Each stage has defined inputs, outputs, status, warnings, and artifacts. Projects are resumable and inspectable. Completed stages are never recomputed; failed or skipped stages leave prior artifacts in place with explicit reasons.
• Honest readiness states. Provider registered, model downloaded, stage ran, and stage succeeded are tracked as distinct states. The UI never claims "GPU ready" when only a DLL is present.
• Model governance by design. Only ONNX models with verified commercial licenses are used. Unknown or non-commercial licenses are treated as unsafe and blocked. The bundled manifest is the single source of truth for model inventory.
• Hardware-aware inference. The runtime probes and falls back across TensorRT-RTX, DirectML, Windows ML, MIGraphX, and CPU. Unsupported acceleration never blocks a workflow; the app explains the fallback.
• Cross-platform desktop shell. Avalonia on .NET 10, with Windows, macOS, and Linux as first-class targets. No browser shell, no one-click SaaS demo.
• Engineering discipline. Clean layered architecture (Domain depends on nothing), architecture tests that enforce dependency direction, fake-backed application tests, and immutable execution snapshots for pipeline stages.

Pipeline

media ingest
  -> audio preparation
  -> optional speech/noise split or dialogue/stem separation
  -> VAD
  -> diarization
  -> ASR
  -> transcript confidence review
  -> translation
  -> glossary / terminology hints
  -> speaker and voice assignment
  -> TTS
  -> timing reconciliation
  -> optional audio-level lip alignment
  -> preview mix
  -> export
  -> optional visual dubbing / generated portrait branches

Status

The foundation (M0-M7) and the workstation spine (M8-M16) are mostly implemented in this repository: repo structure, model manifest policy, SQLite project spine, media ingest, runtime planning, transcript generation, translation, video playback, segment editing, diarization, transcript confidence, Kokoro TTS, timing reconciliation, Spleeter separation, preview mix, voice cloning, export, and hardware acceleration.

Advanced lanes (M17+) are tracked but not claimed as shipped: managed glossary analyzers, Japanese/Chinese/Arabic tokenization, visual dubbing, and generated portrait branches. The current source is the source of truth for what is actually implemented.

Commercial model

Trackdub operates an open-core model:

• Public core (this repo, Apache-2.0): the reusable engine, SDK, CLI, pipeline, inference, media, licensing mechanisms, tooling, and tests.
• Private product (Trackdub-gated): the proprietary desktop product with the Avalonia shell, branding, installer, signing, activation, and tier gating.
• Future private services: api.trackdub, portal.trackdub, and trackdub.com are reserved for server-side activation, product API, portal, and marketing site.
• Contributor licensing: a contributor license agreement lets Trackdub LLC relicense contributions under commercial terms.

This split enables developer adoption through the public core while the commercial product carries tiered features, activation, and support.

Components

Requirements

• .NET 10 SDK (10.0.300+)
• FFmpeg (for audio/video processing)
• libmpv or LibVLC (for playback)

Build

dotnet build Trackdub.slnx -m:1

Test

dotnet test Trackdub.slnx -m:1

Tests that require ONNX models or specific fixtures skip cleanly when dependencies are unavailable.

CLI

dotnet run --project src/Trackdub.Cli -- --help
dotnet run --project src/Trackdub.Cli -- dub --media input.mp4 --target-language es
dotnet run --project src/Trackdub.Cli -- doctor

Solution Filters

• Trackdub.Inference.slnx — Inference, Composition, benchmarks, and tests
• Trackdub.Sdk.slnx — SDK, CLI, and SDK tests

Architecture

Strict layered dependency direction. Domain depends on nothing:

Application -> Contracts, Domain, Licensing
Infrastructure -> Application, Contracts, Domain
Media -> Application, Analyzers, Contracts, Domain
Media.Playback -> Application, Domain
Inference -> Contracts, Domain
Inference.Onnx -> Inference, Contracts, Domain
Composition -> Application, Inference, Inference.Onnx, Infrastructure, Licensing, Media, Media.Playback
Sdk -> Application, Composition, Licensing
Cli -> Sdk
DubBench -> Benchmarks, Domain, Inference, Inference.Onnx
Benchmarks -> Application, Composition, Domain, Inference, Inference.Onnx, Infrastructure
Tools -> Application, Domain, Infrastructure, Media
Contracts -> Domain
Licensing -> (nothing)
Analyzers -> (nothing)
OnnxRuntime.Dnnl.Native -> (nothing)
Domain -> (nothing)

Trust and operations

• CI builds and tests run on Windows, macOS, and Linux.
• CodeQL and Dependabot are configured; security audit documents are maintained under docs/audits/.
• Model manifests are validated in CI for schema, SHA-256 alignment, and commercial license gating.
• No secrets, customer data, pricing policy, or activation server code lives in the public core.
• dotnet format Trackdub.slnx --verify-no-changes is the lint/format gate.

Model Governance

Only ONNX models with verified commercial licenses are supported. The bundled model manifest (src/Trackdub.Inference/Runtime/ModelManifest/bundled-models.manifest.json) is the single source of truth for model inventory.

Documentation

See docs/index.md for the categorized documentation index (ADRs, architecture, specs, audits, operations, and more). Governance and contribution guidelines are in docs/repository-policy.md. For the investor-facing narrative, see investor-deck-brief.md.

License

Apache-2.0. See LICENSE and NOTICE.