WhisperLive

A nearly-live implementation of OpenAI's Whisper.

This project is a real-time transcription application that uses the OpenAI Whisper model to convert speech input into text output. It can be used to transcribe both live audio input from microphone and pre-recorded audio files.

Installation

• Install PyAudio and ffmpeg

 bash scripts/setup.sh

• Install whisper-live from pip

 pip install whisper-live

Setting up NVIDIA/TensorRT-LLM for TensorRT backend

• Please follow TensorRT_whisper readme for setup of NVIDIA/TensorRT-LLM and for building Whisper-TensorRT engine.

Getting Started

The server supports two backends faster_whisper and tensorrt. If running tensorrt backend follow TensorRT_whisper readme

Running the Server

• Faster Whisper backend

python3 run_server.py --port 9090 \
                      --backend faster_whisper
  
# running with custom model
python3 run_server.py --port 9090 \
                      --backend faster_whisper \
                      -fw "/path/to/custom/faster/whisper/model"

• TensorRT backend. Currently, we recommend to only use the docker setup for TensorRT. Follow TensorRT_whisper readme which works as expected. Make sure to build your TensorRT Engines before running the server with TensorRT backend.

# Run English only model
python3 run_server.py -p 9090 \
                      -b tensorrt \
                      -trt /home/TensorRT-LLM/examples/whisper/whisper_small_en

# Run Multilingual model
python3 run_server.py -p 9090 \
                      -b tensorrt \
                      -trt /home/TensorRT-LLM/examples/whisper/whisper_small \
                      -m

Controlling OpenMP Threads

To control the number of threads used by OpenMP, you can set the OMP_NUM_THREADS environment variable. This is useful for managing CPU resources and ensuring consistent performance. If not specified, OMP_NUM_THREADS is set to 1 by default. You can change this by using the --omp_num_threads argument:

python3 run_server.py --port 9090 \
                      --backend faster_whisper \
                      --omp_num_threads 4

Single model mode

By default, when running the server without specifying a model, the server will instantiate a new whisper model for every client connection. This has the advantage, that the server can use different model sizes, based on the client's requested model size. On the other hand, it also means you have to wait for the model to be loaded upon client connection and you will have increased (V)RAM usage.

When serving a custom TensorRT model using the -trt or a custom faster_whisper model using the -fw option, the server will instead only instantiate the custom model once and then reuse it for all client connections.

If you don't want this, set --no_single_model.

Running the Client

• Initializing the client with below parameters:
  • lang: Language of the input audio, applicable only if using a multilingual model.
  • translate: If set to True then translate from any language to en.
  • model: Whisper model size.
  • use_vad: Whether to use Voice Activity Detection on the server.
  • save_output_recording: Set to True to save the microphone input as a .wav file during live transcription. This option is helpful for recording sessions for later playback or analysis. Defaults to False.
  • output_recording_filename: Specifies the .wav file path where the microphone input will be saved if save_output_recording is set to True.
  • max_clients: Specifies the maximum number of clients the server should allow. Defaults to 4.
  • max_connection_time: Maximum connection time for each client in seconds. Defaults to 600.

from whisper_live.client import TranscriptionClient
client = TranscriptionClient(
  "localhost",
  9090,
  lang="en",
  translate=False,
  model="small",                                      # also support hf_model => `Systran/faster-whisper-small`
  use_vad=False,
  save_output_recording=True,                         # Only used for microphone input, False by Default
  output_recording_filename="./output_recording.wav", # Only used for microphone input
  max_clients=4,
  max_connection_time=600
)

It connects to the server running on localhost at port 9090. Using a multilingual model, language for the transcription will be automatically detected. You can also use the language option to specify the target language for the transcription, in this case, English ("en"). The translate option should be set to True if we want to translate from the source language to English and False if we want to transcribe in the source language.

• Transcribe an audio file:

client("tests/jfk.wav")

• To transcribe from microphone:

client()

• To transcribe from a RTSP stream:

client(rtsp_url="rtsp://admin:[email protected]/rtsp")

• To transcribe from a HLS stream:

client(hls_url="http://as-hls-ww-live.akamaized.net/pool_904/live/ww/bbc_1xtra/bbc_1xtra.isml/bbc_1xtra-audio%3d96000.norewind.m3u8")

Browser Extensions

• Run the server with your desired backend as shown here.
• Transcribe audio directly from your browser using our Chrome or Firefox extensions. Refer to Audio-Transcription-Chrome and Audio-Transcription-Firefox for setup instructions.

Whisper Live Server in Docker

• GPU

  • Faster-Whisper

  docker run -it --gpus all -p 9090:9090 ghcr.io/collabora/whisperlive-gpu:latest

  • TensorRT.

  docker run -p 9090:9090 --runtime=nvidia --gpus all --entrypoint /bin/bash -it ghcr.io/collabora/whisperlive-tensorrt
  
  # Build small.en engine
  bash build_whisper_tensorrt.sh /app/TensorRT-LLM-examples small.en        # float16
  bash build_whisper_tensorrt.sh /app/TensorRT-LLM-examples small.en int8   # int8 weight only quantization
  bash build_whisper_tensorrt.sh /app/TensorRT-LLM-examples small.en int4   # int4 weight only quantization
  
  # Run server with small.en
  python3 run_server.py --port 9090 \
                        --backend tensorrt \
                        --trt_model_path "/app/TensorRT-LLM-examples/whisper/whisper_small_en_float16"
                        --trt_model_path "/app/TensorRT-LLM-examples/whisper/whisper_small_en_int8"
                        --trt_model_path "/app/TensorRT-LLM-examples/whisper/whisper_small_en_int4"

• CPU

docker run -it -p 9090:9090 ghcr.io/collabora/whisperlive-cpu:latest

Note: By default we use "small" model size. To build docker image for a different model size, change the size in server.py and then build the docker image.

Future Work

• Add translation to other languages on top of transcription.
• TensorRT backend for Whisper.

Contact

We are available to help you with both Open Source and proprietary AI projects. You can reach us via the Collabora website or [email protected] and [email protected].

Citations

@article{Whisper
  title = {Robust Speech Recognition via Large-Scale Weak Supervision},
  url = {https://arxiv.org/abs/2212.04356},
  author = {Radford, Alec and Kim, Jong Wook and Xu, Tao and Brockman, Greg and McLeavey, Christine and Sutskever, Ilya},
  publisher = {arXiv},
  year = {2022},
}

@misc{Silero VAD,
  author = {Silero Team},
  title = {Silero VAD: pre-trained enterprise-grade Voice Activity Detector (VAD), Number Detector and Language Classifier},
  year = {2021},
  publisher = {GitHub},
  journal = {GitHub repository},
  howpublished = {\url{https://github.com/snakers4/silero-vad}},
  email = {hello@silero.ai}
}