# Protocol

## Gradio endpoint

- API name: `/process_single`
- Audio input parameter: `audio_file`
- Video input parameter: `video_file`
- Output component: single `gr.Video`

The function returns a video object compatible with Gradio client responses:

```json
{
  "video": "D:/path/to/result.mp4",
  "subtitles": null
}
```

## Notes

The upstream desktop app reads `result["video"]` from `scripts/digital_human_process.py`, so this service intentionally exposes one video output instead of multiple outputs. Adding extra Gradio outputs would change `client.predict` into a tuple and break compatibility.