so-vits-svc - SoftVC VITS Singing Voice Conversion

Created at: 2023-03-10 17:31:09
Language: Python
License: BSD-3-Clause

SoftVC VITS Singing Voice Conversion

In the field of Singing Voice Conversion, there is not only one project, SoVitsSvc, but also many other projects, which will not be listed here. The project was officially discontinued for maintenance and Archived. However, there are still other enthusiasts who have created their own branches and continue to maintain the SoVitsSvc project (still unrelated to SvcDevelopTeam and the repository maintainers) and have made some big changes to it for you to find out for yourself.

A fork with a greatly improved interface: 34j/so-vits-svc-fork

A client supports real-time conversion: w-okada/voice-changer

This project is fundamentally different from Vits. Vits is TTS and this project is SVC. TTS cannot be carried out in this project, and Vits cannot carry out SVC, and the two project models are not universal


This project is an open source, offline project, and all members of SvcDevelopTeam and all developers and maintainers of this project (hereinafter referred to as contributors) have no control over this project. The contributor of this project has never provided any organization or individual with any form of assistance, including but not limited to data set extraction, data set processing, computing support, training support, infering, etc. Contributors to the project do not and cannot know what users are using the project for. Therefore, all AI models and synthesized audio based on the training of this project have nothing to do with the contributors of this project. All problems arising therefrom shall be borne by the user.

This project is run completely offline and cannot collect any user information or obtain user input data. Therefore, contributors to this project are not aware of all user input and models and therefore are not responsible for any user input.

This project is only a framework project, which does not have the function of speech synthesis itself, and all the functions require the user to train the model themselves. Meanwhile, there is no model attached to this project, and any secondary distributed project has nothing to do with the contributors of this project

📏 Terms of Use

Warning: Please solve the authorization problem of the dataset on your own. You shall be solely responsible for any problems caused by the use of non-authorized datasets for training and all consequences thereof.The repository and its maintainer, svc develop team, have nothing to do with the consequences!

  1. This project is established for academic exchange purposes only and is intended for communication and learning purposes. It is not intended for production environments.
  2. Any videos based on sovits that are published on video platforms must clearly indicate in the description that they are used for voice changing and specify the input source of the voice or audio, for example, using videos or audios published by others and separating the vocals as input source for conversion, which must provide clear original video or music links. If your own voice or other synthesized voices from other commercial vocal synthesis software are used as the input source for conversion, you must also explain it in the description.
  3. You shall be solely responsible for any infringement problems caused by the input source. When using other commercial vocal synthesis software as input source, please ensure that you comply with the terms of use of the software. Note that many vocal synthesis engines clearly state in their terms of use that they cannot be used for input source conversion.
  4. It is forbidden to use the project to engage in illegal activities, religious and political activities. The project developers firmly resist the above activities. If they do not agree with this article, the use of the project is prohibited.
  5. Continuing to use this project is deemed as agreeing to the relevant provisions stated in this repository README. This repository README has the obligation to persuade, and is not responsible for any subsequent problems that may arise.
  6. If you use this project for any other plan, please contact and inform the author of this repository in advance. Thank you very much.

🆕 Update!

Updated the 4.0-v2 model, the entire process is the same as 4.0. Compared to 4.0, there is some improvement in certain scenarios, but there are also some cases where it has regressed. Please refer to the 4.0-v2 branch for more information.

📝 4.0 Feature list of branches

Branch Feature whether compatible with the main branch model
4.0 main branch -
4.0v2 The VISinger2 model is used incompatibility
4.0-Vec768-Layer12 The feature input is the Layer 12 Transformer output of the Content Vec incompatibility

📝 Model Introduction

The singing voice conversion model uses SoftVC content encoder to extract source audio speech features, then the vectors are directly fed into VITS instead of converting to a text based intermediate; thus the pitch and intonations are conserved. Additionally, the vocoder is changed to NSF HiFiGAN to solve the problem of sound interruption.

🆕 4.0 Version Update Content

  • Feature input is changed to Content Vec
  • The sampling rate is unified to use 44100Hz
  • Due to the change of hop size and other parameters, as well as the streamlining of some model structures, the required GPU memory for inference is significantly reduced. The 44kHz GPU memory usage of version 4.0 is even smaller than the 32kHz usage of version 3.0.
  • Some code structures have been adjusted
  • The dataset creation and training process are consistent with version 3.0, but the model is completely non-universal, and the data set needs to be fully pre-processed again.
  • Added an option 1: automatic pitch prediction for vc mode, which means that you don't need to manually enter the pitch key when converting speech, and the pitch of male and female voices can be automatically converted. However, this mode will cause pitch shift when converting songs.
  • Added option 2: reduce timbre leakage through k-means clustering scheme, making the timbre more similar to the target timbre.
  • Added option 3: Added NSF-HIFIGAN Enhancer, which has certain sound quality enhancement effect on some models with few train-sets, but has negative effect on well-trained models, so it is closed by default

💬 About Python Version

After conducting tests, we believe that the project runs stably on Python 3.8.9.

📥 Pre-trained Model Files


# contentvec
wget -P hubert/
# Alternatively, you can manually download and place it in the hubert directory

Optional(Strongly recommend)

  • Pre-trained model files: G_0.pth D_0.pth
    • Place them under the logs/44k directory

Get them from svc-develop-team(TBD) or anywhere else.

Although the pretrained model generally does not cause any copyright problems, please pay attention to it. For example, ask the author in advance, or the author has indicated the feasible use in the description clearly.

Optional(Select as Required)

If you are using the NSF-HIFIGAN enhancer, you will need to download the pre-trained NSF-HIFIGAN model, or not if you do not need it.

  • Pre-trained NSF-HIFIGAN Vocoder:
    • Unzip and place the four files under the pretrain/nsf_hifigan directory
# nsf_hifigan
# Alternatively, you can manually download and place it in the pretrain/nsf_hifigan directory
# URL:

📊 Dataset Preparation

Simply place the dataset in the dataset_raw directory with the following file structure.

│   ├───xxx1-xxx1.wav
│   ├───...
│   └───Lxx-0xx8.wav

You can customize the speaker name.


🛠️ Preprocessing

0. Slice audio

Slice to 5s - 15s, a bit longer is no problem. Too long may lead to torch.cuda.OutOfMemoryError during training or even pre-processing.

By using audio-slicer-GUI or audio-slicer-CLI

In general, only the Minimum Interval needs to be adjusted. For statement audio it usually remains default. For singing audio it can be adjusted to 100 or even 50.

After slicing, delete audio that is too long and too short.

1. Resample to 44100Hz and mono


2. Automatically split the dataset into training and validation sets, and generate configuration files.


3. Generate hubert and f0


After completing the above steps, the dataset directory will contain the preprocessed data, and the dataset_raw folder can be deleted.

You can modify some parameters in the generated config.json

  • keep_ckpts: Keep the last keep_ckpts models during training. Set to 0 will keep them all. Default is 3.

  • all_in_mem: Load all dataset to RAM. It can be enabled when the disk IO of some platforms is too low and the system memory is much larger than your dataset.

🏋️‍♀️ Training

python -c configs/config.json -m 44k

🤖 Inference


# Example
python -m "logs/44k/G_30400.pth" -c "configs/config.json" -s "nen" -n "君の知らない物語-src.wav" -t 0

Required parameters:

  • -m | --model_path: Path to the model.
  • -c | --config_path: Path to the configuration file.
  • -s | --spk_list: Target speaker name for conversion.
  • -n | --clean_names: A list of wav file names located in the raw folder.
  • -t | --trans: Pitch adjustment, supports positive and negative (semitone) values.

Optional parameters: see the next section

  • -a | --auto_predict_f0: Automatic pitch prediction for voice conversion. Do not enable this when converting songs as it can cause serious pitch issues.
  • -cl | --clip: Voice forced slicing. Set to 0 to turn off(default), duration in seconds.
  • -lg | --linear_gradient: The cross fade length of two audio slices in seconds. If there is a discontinuous voice after forced slicing, you can adjust this value. Otherwise, it is recommended to use. Default 0.
  • -cm | --cluster_model_path: Path to the clustering model. Fill in any value if clustering is not trained.
  • -cr | --cluster_infer_ratio: Proportion of the clustering solution, range 0-1. Fill in 0 if the clustering model is not trained.
  • -fmp | --f0_mean_pooling: Apply mean filter (pooling) to f0, which may improve some hoarse sounds. Enabling this option will reduce inference speed.
  • -eh | --enhance: Whether to use NSF_HIFIGAN enhancer. This option has certain effect on sound quality enhancement for some models with few training sets, but has negative effect on well-trained models, so it is turned off by default.

🤔 Optional Settings

If the results from the previous section are satisfactory, or if you didn't understand what is being discussed in the following section, you can skip it, and it won't affect the model usage. (These optional settings have a relatively small impact, and they may have some effect on certain specific data, but in most cases, the difference may not be noticeable.)

Automatic f0 prediction

During the 4.0 model training, an f0 predictor is also trained, which can be used for automatic pitch prediction during voice conversion. However, if the effect is not good, manual pitch prediction can be used instead. But please do not enable this feature when converting singing voice as it may cause serious pitch shifting!

  • Set auto_predict_f0 to true in inference_main.

Cluster-based timbre leakage control

Introduction: The clustering scheme can reduce timbre leakage and make the trained model sound more like the target's timbre (although this effect is not very obvious), but using clustering alone will lower the model's clarity (the model may sound unclear). Therefore, this model adopts a fusion method to linearly control the proportion of clustering and non-clustering schemes. In other words, you can manually adjust the ratio between "sounding like the target's timbre" and "being clear and articulate" to find a suitable trade-off point.

The existing steps before clustering do not need to be changed. All you need to do is to train an additional clustering model, which has a relatively low training cost.

  • Training process:
    • Train on a machine with good CPU performance. According to my experience, it takes about 4 minutes to train each speaker on a Tencent Cloud machine with 6-core CPU.
    • Execute python cluster/ The output model will be saved in logs/44k/
  • Inference process:
    • Specify cluster_model_path in
    • Specify cluster_infer_ratio in, where 0 means not using clustering at all, 1 means only using clustering, and usually 0.5 is sufficient.

F0 mean filtering

Introduction: The mean filtering of F0 can effectively reduce the hoarse sound caused by the predicted fluctuation of pitch (the hoarse sound caused by reverb or harmony can not be eliminated temporarily). This function has been greatly improved on some songs. However, some songs are out of tune. If the song appears dumb after reasoning, it can be considered to open.

  • Set f0_mean_pooling to true in

Open in Colab sovits4_for_colab.ipynb

[23/03/16] No longer need to download hubert manually

[23/04/14] Support NSF_HIFIGAN enhancer

📤 Exporting to Onnx


  • Create a folder named checkpoints and open it
  • Create a folder in the checkpoints folder as your project folder, naming it after your project, for example aziplayer
  • Rename your model as model.pth, the configuration file as config.json, and place them in the aziplayer folder you just created
  • Modify "NyaruTaffy" in path = "NyaruTaffy" in to your project name, path = "aziplayer"
  • Run
  • Wait for it to finish running. A model.onnx will be generated in your project folder, which is the exported model.

UI support for Onnx models

Note: For Hubert Onnx models, please use the models provided by MoeSS. Currently, they cannot be exported on their own (Hubert in fairseq has many unsupported operators and things involving constants that can cause errors or result in problems with the input/output shape and results when exported.)

CppDataProcess are some functions to preprocess data used in MoeSS

🤔The relationship between original project(so-vits-svc by original author), this project and so-vits-svc-5.0

If the original project is equivalent to the Roman Empire, This project is Eastern Roman Empire(The Byzantine Empire) and so-vits-svc-5.0 is Kingdom of Romania

☀️ Previous contributors

For some reason the author deleted the original repository. Because of the negligence of the organization members, the contributor list was cleared because all files were directly reuploaded to this repository at the beginning of the reconstruction of this repository. Now add a previous contributor list to

Some members have not listed according to their personal wishes.








📚 Some legal provisions for reference

Any country, region, organization, or individual using this project must comply with the following laws.











💪 Thanks to all contributors for their efforts