Add the translation service to the translation demo#78
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Pull request overview
This PR adds a dedicated Python “translation service” to the translation-demo so the web app can discover and subscribe to live, AI-translated MoQ audio (and transcript/captions) tracks announced alongside source broadcasts.
Changes:
- Introduces a new
translation-demo/servicePython project (moq-live-translation) that watches relay announcements and publishes on-demand translated audio + transcript tracks (Gemini Live via the “google” provider). - Adds provider-neutral translation plumbing (media pipeline, provider contracts, dynamic track handling, transcript publishing, session stats).
- Updates demo documentation and environment templates to include service credentials and runtime instructions.
Reviewed changes
Copilot reviewed 21 out of 22 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| translation-demo/src/utils/translation.ts | Adjusts translation provider label mapping used by the web UI. |
| translation-demo/service/uv.lock | Adds uv lockfile for the new Python translation service dependencies. |
| translation-demo/service/src/moq_live_translation/translator.py | Orchestrates per-track translation (decode → provider → encode) and optional transcript handling. |
| translation-demo/service/src/moq_live_translation/transcript.py | Publishes translated transcript updates to a dedicated MoQ text track (<lang>/transcript.json). |
| translation-demo/service/src/moq_live_translation/stats.py | Implements per-session timing/latency statistics collection and periodic logging. |
| translation-demo/service/src/moq_live_translation/service.py | Core async service: watches announcements, publishes translation broadcasts, serves dynamic requested tracks. |
| translation-demo/service/src/moq_live_translation/providers/google.py | Google Gemini Live translation provider implementation over websockets. |
| translation-demo/service/src/moq_live_translation/providers/base.py | Provider-neutral datatypes and Protocol interfaces for providers/sessions. |
| translation-demo/service/src/moq_live_translation/providers/init.py | Re-exports provider contract symbols for convenient imports. |
| translation-demo/service/src/moq_live_translation/moq_compat.py | Compatibility shims/monkeypatching for differing MoQ Python wrapper capabilities. |
| translation-demo/service/src/moq_live_translation/media.py | Provider-neutral audio decode/resample/encode pipeline using PyAV. |
| translation-demo/service/src/moq_live_translation/fishjam.py | Fetches MoQ access tokens from Fishjam for authenticated relay connections. |
| translation-demo/service/src/moq_live_translation/cli.py | CLI entrypoint and flags to run the translation service (direct relay or Fishjam). |
| translation-demo/service/src/moq_live_translation/catalog.py | Builds publishable output track parameters from Hang catalog audio entries. |
| translation-demo/service/src/moq_live_translation/main.py | Enables python -m moq_live_translation execution. |
| translation-demo/service/src/moq_live_translation/init.py | Exposes the CLI main entrypoint as the package API. |
| translation-demo/service/README.md | Documents how to run/configure the translation service and its track contracts. |
| translation-demo/service/pyproject.toml | Defines the new Python project, dependencies, and moq-live-translation script. |
| translation-demo/service/.python-version | Pins the Python version for the service directory. |
| translation-demo/README.md | Updates demo-level docs to include the new service and required credentials. |
| translation-demo/.gitignore | Ignores the service venv and Python cache artifacts. |
| translation-demo/.env.example | Adds Fishjam + Gemini environment variables needed by the service. |
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| self.model_latency.record( | ||
| self.latest_model_input_end_us - self.latest_model_output_end_us | ||
| ) |
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| "translationConfig": { | ||
| "targetLanguageCode": self.context.target_language, | ||
| "echoTargetLanguage": True, | ||
| }, |
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| const PROVIDER_LABELS: Record<string, string> = { | ||
| openai: "OpenAI", | ||
| google: "Google", | ||
| }; |
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Qizot
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Jul 22, 2026
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My only concern is having a top-level generic name translation-demo where in face this is moq-specific translation demo/service.
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