---
license: mit
language:
- zh
pipeline_tag: text-to-speech
library_name: onnxruntime
tags:
- openvoice
- melotts
- onnx
- xrtranslate
base_model:
- myshell-ai/MeloTTS-Chinese
---

# XRTranslate OpenVoice ONNX

Community-maintained, reproducible ONNX conversions of official MyShell MeloTTS
language checkpoints for XRTranslate's pure-Rust OpenVoice V2 provider. These
are not official MyShell or NVIDIA artifacts.

## Packages

| Package | Language | Precision | Installed size | Base output |
| --- | --- | --- | ---: | ---: |
| `openvoice-v2-zh-onnx-fp16` | Chinese (mixed English) | FP32 text / FP16 acoustic | 460.9 MiB | 44,100 Hz |

Each package is self-contained: its language-specific frontend and feature
graph, MeloTTS acoustic graph, OpenVoice V2 converter, reference speaker
encoder, source tone embedding, licenses, and a machine-readable per-file
SHA-256 manifest. XRTranslate returns converted audio at 22,050 Hz mono PCM16.

## Reproducibility

The production graphs are exported in the existing `torch211cu128` Conda
environment with Python 3.10, PyTorch `2.11.0+cu128`, CUDA 12.8, ONNX 1.22.0,
ONNX Runtime 1.23.2, and opset 16. PyTorch is not upgraded or downgraded.

```powershell
conda run -n torch211cu128 python third_party/openvoice_onnx_export/build.py `
  --language <language-key> `
  --output runtime/.temp/openvoice-onnx-export
```

Exact upstream commits, source hashes, graph tensor contracts, conversion
versions, smoke-test results, and produced file hashes are recorded in each
`packages/<language-key>/v1/package-manifest.json`.

## Upstream and licenses

- [MeloTTS](https://github.com/myshell-ai/MeloTTS) and
  [OpenVoice](https://github.com/myshell-ai/OpenVoice) are MIT licensed.
- Each package manifest pins its exact MeloTTS checkpoint repository and commit.
- Source tone embeddings come from
  [`myshell-ai/OpenVoiceV2`](https://huggingface.co/myshell-ai/OpenVoiceV2).
- Language-specific BERT/tokenizer, G2P, dictionary, and normalization notices
  are preserved inside that package.

See each package's `licenses/` directory before redistribution.

## Limitations

The packages require a compatible CUDA ONNX Runtime in XRTranslate. They are
not standalone Python TTS APIs. Voice cloning transfers tone color;
pronunciation, accent, and prosody remain controlled by the selected MeloTTS
language pack.