FireRedVAD: A SOTA Industrial-Grade
Voice Activity Detection & Audio Event Detection

[Paper] [Code] [HuggingFace] [ModelScope]

FireRedVAD is a state-of-the-art (SOTA) industrial-grade Voice Activity Detection (VAD) and Audio Event Detection (AED) solution. It was introduced as part of FireRedASR2S.

FireRedVAD supports non-streaming/streaming VAD and non-streaming AED. It supports speech/singing/music detection in 100+ languages. Non-streaming VAD achieves 97.57% F1 on FLEURS-VAD-102, outperforming Silero-VAD, TEN-VAD, FunASR-VAD and WebRTC-VAD.

🔥 News

• [2026.03.12] 🔥 We release FireRedASR2S technical report. See arXiv.
• [2026.03.03] We release FireRedVAD as a standalone repository, along with model weights and inference code.
• [2026.02.12] We release FireRedASR2S (FireRedASR2-AED, FireRedVAD, FireRedLID, and FireRedPunc) with model weights and inference code.

Method

DFSMN-based non-streaming/streaming Voice Activity Detection and Audio Event Detection.

Evaluation

FireRedVAD

We evaluate FireRedVAD on FLEURS-VAD-102, a multilingual VAD benchmark covering 102 languages.

FireRedVAD achieves SOTA performance, outperforming Silero-VAD, TEN-VAD, FunASR-VAD, and WebRTC-VAD.

^*FLEURS-VAD-102: We randomly selected ~100 audio files per language from FLEURS test set, resulting in 9,443 audio files with manually annotated binary VAD labels (speech=1, silence=0). This VAD testset will be open sourced (coming soon).

Note: FunASR-VAD achieves low Miss Rate but at the cost of high False Alarm Rate (44.03%), indicating over-prediction of speech segments.

Quick Start

Setup

1. Create a clean Python environment:

$ conda create --name fireredvad python=3.10
$ conda activate fireredvad
$ git clone https://github.com/FireRedTeam/FireRedVAD.git
$ cd FireRedVAD  # or fireredvad

2. Install dependencies and set up PATH and PYTHONPATH:

$ pip install -r requirements.txt
$ export PATH=$PWD/fireredvad/bin/:$PATH
$ export PYTHONPATH=$PWD/:$PYTHONPATH

3. Download models:

# Download via ModelScope (recommended for users in China)
pip install -U modelscope
modelscope download --model xukaituo/FireRedVAD --local_dir ./pretrained_models/FireRedVAD

# Download via Hugging Face
pip install -U "huggingface_hub[cli]"
huggingface-cli download FireRedTeam/FireRedVAD --local-dir ./pretrained_models/FireRedVAD

4. Convert your audio to 16kHz 16-bit mono PCM format if needed:

$ ffmpeg -i <input_audio_path> -ar 16000 -ac 1 -acodec pcm_s16le -f wav <output_wav_path>

Script Usage

$ cd examples
$ bash inference_vad.sh
$ bash inference_stream_vad.sh
$ bash inference_aed.sh

Command-line Usage

Set up PATH and PYTHONPATH first: export PATH=$PWD/fireredvad/bin/:$PATH; export PYTHONPATH=$PWD/:$PYTHONPATH

$ vad.py --help
$ vad.py --use_gpu 0 --model_dir pretrained_models/FireRedVAD/VAD --smooth_window_size 5 --speech_threshold 0.4 \
    --min_speech_frame 20 --max_speech_frame 3000 --min_silence_frame 10 --merge_silence_frame 0 \
    --extend_speech_frame 0 --chunk_max_frame 30000 --write_textgrid 1 \
    --wav_path assets/hello_zh.wav --output out/vad.txt --save_segment_dir out/vad

$ stream_vad.py --help
$ stream_vad.py --use_gpu 0 --model_dir pretrained_models/FireRedVAD/Stream-VAD --smooth_window_size 5 --speech_threshold 0.3 \
    --pad_start_frame 5 --min_speech_frame 8 --max_speech_frame 2000 --min_silence_frame 20 \
    --chunk_max_frame 30000 --write_textgrid 1 \
    --wav_path assets/hello_en.wav --output out/vad.txt --save_segment_dir out/stream_vad

$ aed.py --help
$ aed.py --use_gpu 0 --model_dir pretrained_models/FireRedVAD/AED --smooth_window_size 5 --speech_threshold 0.4 \
    --singing_threshold 0.5 --music_threshold 0.5 --min_event_frame 20 --max_event_frame 3000 \
    --min_silence_frame 10 --merge_silence_frame 0 --extend_speech_frame 0 --chunk_max_frame 30000 --write_textgrid 1 \
    --wav_path assets/event.wav --output out/aed.txt --save_segment_dir out/aed

Python API Usage

Set up PYTHONPATH first: export PYTHONPATH=$PWD/:$PYTHONPATH

Non-streaming VAD

from fireredvad import FireRedVad, FireRedVadConfig

vad_config = FireRedVadConfig(
    use_gpu=False,
    smooth_window_size=5,
    speech_threshold=0.4,
    min_speech_frame=20,
    max_speech_frame=2000,
    min_silence_frame=20,
    merge_silence_frame=0,
    extend_speech_frame=0,
    chunk_max_frame=30000)
vad = FireRedVad.from_pretrained("pretrained_models/FireRedVAD/VAD", vad_config)

result, probs = vad.detect("assets/hello_zh.wav")

print(result)
# {'dur': 2.32, 'timestamps': [(0.44, 1.82)], 'wav_path': 'assets/hello_zh.wav'}

Streaming VAD

from fireredvad import FireRedStreamVad, FireRedStreamVadConfig

vad_config=FireRedStreamVadConfig(
    use_gpu=False,
    smooth_window_size=5,
    speech_threshold=0.4,
    pad_start_frame=5,
    min_speech_frame=8,
    max_speech_frame=2000,
    min_silence_frame=20,
    chunk_max_frame=30000)
stream_vad = FireRedStreamVad.from_pretrained("pretrained_models/FireRedVAD/Stream-VAD", vad_config)

frame_results, result = stream_vad.detect_full("assets/hello_en.wav")

print(result)
# {'dur': 2.24, 'timestamps': [(0.28, 1.83)], 'wav_path': 'assets/hello_en.wav'}

Non-streaming AED

from fireredvad import FireRedAed, FireRedAedConfig

aed_config=FireRedAedConfig(
    use_gpu=False,
    smooth_window_size=5,
    speech_threshold=0.4,
    singing_threshold=0.5,
    music_threshold=0.5,
    min_event_frame=20,
    max_event_frame=2000,
    min_silence_frame=20,
    merge_silence_frame=0,
    extend_speech_frame=0,
    chunk_max_frame=30000)
aed = FireRedAed.from_pretrained("pretrained_models/FireRedVAD/AED", aed_config)

result, probs = aed.detect("assets/event.wav")

print(result)
# {'dur': 22.016, 'event2timestamps': {'speech': [(0.4, 3.56), (3.66, 9.08), (9.27, 9.77), (10.78, 21.76)], 'singing': [(1.79, 19.96), (19.97, 22.016)], 'music': [(0.09, 12.32), (12.33, 22.016)]}, 'event2ratio': {'speech': 0.848, 'singing': 0.905, 'music': 0.991}, 'wav_path': 'assets/event.wav'}

FAQ

Q: What audio format is supported?

16kHz 16-bit mono PCM wav. Use ffmpeg to convert other formats: ffmpeg -i <input_audio_path> -ar 16000 -ac 1 -acodec pcm_s16le -f wav <output_wav_path>

Citation

@article{xu2026fireredasr2s,
  title={FireRedASR2S: A State-of-the-Art Industrial-Grade All-in-One Automatic Speech Recognition System},
  author={Xu, Kaituo and Jia, Yan and Huang, Kai and Chen, Junjie and Li, Wenpeng and Liu, Kun and Xie, Feng-Long and Tang, Xu and Hu, Yao},
  journal={arXiv preprint arXiv:2603.10420},
  year={2026}
}