pywhispercpp 1.4.1

Python bindings for whisper.cpp

pywhispercpp

Python bindings for whisper.cpp with a simple Pythonic API on top of it.

Table of contents

• Installation
  • From source
  • Pre-built wheels
  • NVIDIA GPU support
  • CoreML support
  • Vulkan support
• Quick start
• Examples
  • CLI
  • GUI
  • Assistant
• Advanced usage
• Discussions and contributions
• License

Installation

From source

• For the best performance, you need to install the package from source:

pip install git+https://github.com/absadiki/pywhispercpp

Pre-built wheels

• Otherwise, Basic Pre-built CPU wheels are available on PYPI

pip install pywhispercpp # or pywhispercpp[examples] to install the extra dependencies needed for the examples

[Optional] To transcribe files other than wav, you need to install ffmpeg:

# on Ubuntu or Debian
sudo apt update && sudo apt install ffmpeg

# on Arch Linux
sudo pacman -S ffmpeg

# on MacOS using Homebrew (https://brew.sh/)
brew install ffmpeg

# on Windows using Chocolatey (https://chocolatey.org/)
choco install ffmpeg

# on Windows using Scoop (https://scoop.sh/)
scoop install ffmpeg

NVIDIA GPU support

To Install the package with CUDA support, make sure you have cuda installed and use GGML_CUDA=1:

GGML_CUDA=1 pip install git+https://github.com/absadiki/pywhispercpp

CoreML support

Install the package with WHISPER_COREML=1:

WHISPER_COREML=1 pip install git+https://github.com/absadiki/pywhispercpp

Vulkan support

Install the package with GGML_VULKAN=1:

GGML_VULKAN=1 pip install git+https://github.com/absadiki/pywhispercpp

OpenBLAS support

If OpenBLAS is installed, you can use GGML_BLAS=1. The other flags ensure you're installing fresh with the correct flags, and printing output for sanity checking.

GGML_BLAS=1 pip install git+https://github.com/absadiki/pywhispercpp --no-cache --force-reinstall -v

OpenVINO support

Follow the the steps to download correct OpenVINO package (https://github.com/ggerganov/whisper.cpp?tab=readme-ov-file#openvino-support).

Then init the OpenVINO environment and build.

source ~/l_openvino_toolkit_ubuntu22_2023.0.0.10926.b4452d56304_x86_64/setupvars.sh 
WHISPER_OPENVINO=1 pip install git+https://github.com/absadiki/pywhispercpp --no-cache --force-reinstall

Note that the toolkit for Ubuntu22 works on Ubuntu24

** Feel free to update this list and submit a PR if you tested the package on other backends.

Quick start

from pywhispercpp.model import Model

model = Model('base.en')
segments = model.transcribe('file.wav')
for segment in segments:
    print(segment.text)

You can also assign a custom new_segment_callback

from pywhispercpp.model import Model

model = Model('base.en', print_realtime=False, print_progress=False)
segments = model.transcribe('file.mp3', new_segment_callback=print)

• The model will be downloaded automatically, or you can use the path to a local model.
• You can pass any whisper.cpp parameter as a keyword argument to the Model class or to the transcribe function.
• Check the Model class documentation for more details.

Examples

CLI

Just a straightforward example Command Line Interface. You can use it as follows:

pwcpp file.wav -m base --output-srt --print_realtime true

Run pwcpp --help to get the help message

usage: pwcpp [-h] [-m MODEL] [--version] [--processors PROCESSORS] [-otxt] [-ovtt] [-osrt] [-ocsv] [--strategy STRATEGY]
             [--n_threads N_THREADS] [--n_max_text_ctx N_MAX_TEXT_CTX] [--offset_ms OFFSET_MS] [--duration_ms DURATION_MS]
             [--translate TRANSLATE] [--no_context NO_CONTEXT] [--single_segment SINGLE_SEGMENT] [--print_special PRINT_SPECIAL]
             [--print_progress PRINT_PROGRESS] [--print_realtime PRINT_REALTIME] [--print_timestamps PRINT_TIMESTAMPS]
             [--token_timestamps TOKEN_TIMESTAMPS] [--thold_pt THOLD_PT] [--thold_ptsum THOLD_PTSUM] [--max_len MAX_LEN]
             [--split_on_word SPLIT_ON_WORD] [--max_tokens MAX_TOKENS] [--audio_ctx AUDIO_CTX]
             [--prompt_tokens PROMPT_TOKENS] [--prompt_n_tokens PROMPT_N_TOKENS] [--language LANGUAGE] [--suppress_blank SUPPRESS_BLANK]
             [--suppress_non_speech_tokens SUPPRESS_NON_SPEECH_TOKENS] [--temperature TEMPERATURE] [--max_initial_ts MAX_INITIAL_TS]
             [--length_penalty LENGTH_PENALTY] [--temperature_inc TEMPERATURE_INC] [--entropy_thold ENTROPY_THOLD]
             [--logprob_thold LOGPROB_THOLD] [--no_speech_thold NO_SPEECH_THOLD] [--greedy GREEDY] [--beam_search BEAM_SEARCH]
             media_file [media_file ...]

positional arguments:
  media_file            The path of the media file or a list of filesseparated by space

options:
  -h, --help            show this help message and exit
  -m MODEL, --model MODEL
                        Path to the `ggml` model, or just the model name
  --version             show program's version number and exit
  --processors PROCESSORS
                        number of processors to use during computation
  -otxt, --output-txt   output result in a text file
  -ovtt, --output-vtt   output result in a vtt file
  -osrt, --output-srt   output result in a srt file
  -ocsv, --output-csv   output result in a CSV file
  --strategy STRATEGY   Available sampling strategiesGreefyDecoder -> 0BeamSearchDecoder -> 1
  --n_threads N_THREADS
                        Number of threads to allocate for the inferencedefault to min(4, available hardware_concurrency)
  --n_max_text_ctx N_MAX_TEXT_CTX
                        max tokens to use from past text as prompt for the decoder
  --offset_ms OFFSET_MS
                        start offset in ms
  --duration_ms DURATION_MS
                        audio duration to process in ms
  --translate TRANSLATE
                        whether to translate the audio to English
  --no_context NO_CONTEXT
                        do not use past transcription (if any) as initial prompt for the decoder
  --single_segment SINGLE_SEGMENT
                        force single segment output (useful for streaming)
  --print_special PRINT_SPECIAL
                        print special tokens (e.g. <SOT>, <EOT>, <BEG>, etc.)
  --print_progress PRINT_PROGRESS
                        print progress information
  --print_realtime PRINT_REALTIME
                        print results from within whisper.cpp (avoid it, use callback instead)
  --print_timestamps PRINT_TIMESTAMPS
                        print timestamps for each text segment when printing realtime
  --token_timestamps TOKEN_TIMESTAMPS
                        enable token-level timestamps
  --thold_pt THOLD_PT   timestamp token probability threshold (~0.01)
  --thold_ptsum THOLD_PTSUM
                        timestamp token sum probability threshold (~0.01)
  --max_len MAX_LEN     max segment length in characters
  --split_on_word SPLIT_ON_WORD
                        split on word rather than on token (when used with max_len)
  --max_tokens MAX_TOKENS
                        max tokens per segment (0 = no limit)
  --audio_ctx AUDIO_CTX
                        overwrite the audio context size (0 = use default)
  --prompt_tokens PROMPT_TOKENS
                        tokens to provide to the whisper decoder as initial prompt
  --prompt_n_tokens PROMPT_N_TOKENS
                        tokens to provide to the whisper decoder as initial prompt
  --language LANGUAGE   for auto-detection, set to None, "" or "auto"
  --suppress_blank SUPPRESS_BLANK
                        common decoding parameters
  --suppress_non_speech_tokens SUPPRESS_NON_SPEECH_TOKENS
                        common decoding parameters
  --temperature TEMPERATURE
                        initial decoding temperature
  --max_initial_ts MAX_INITIAL_TS
                        max_initial_ts
  --length_penalty LENGTH_PENALTY
                        length_penalty
  --temperature_inc TEMPERATURE_INC
                        temperature_inc
  --entropy_thold ENTROPY_THOLD
                        similar to OpenAI's "compression_ratio_threshold"
  --logprob_thold LOGPROB_THOLD
                        logprob_thold
  --no_speech_thold NO_SPEECH_THOLD
                        no_speech_thold
  --greedy GREEDY       greedy
  --beam_search BEAM_SEARCH
                        beam_search

GUI

If you prefer a Graphical User Interface, you can use the pwcpp-gui command which will launch A simple graphical interface built with PyQt5.

• First you need to install the GUI dependencies:

pip install pywhispercpp[gui]

• Then you can run the GUI with:

pwcpp-gui

The GUI provides a user-friendly way to:

• Select audio files
• Choose models
• Adjust basic transcription settings
• View and export transcription results

Assistant

This is a simple example showcasing the use of pywhispercpp to create an assistant like example. The idea is to use a Voice Activity Detector (VAD) to detect speech (in this example, we used webrtcvad), and when some speech is detected, we run the transcription. It is inspired from the whisper.cpp/examples/command example.

You can check the source code here or you can use the class directly to create your own assistant:

from pywhispercpp.examples.assistant import Assistant

my_assistant = Assistant(commands_callback=print, n_threads=8)
my_assistant.start()

Here, we set the commands_callback to a simple print function, so the commands will just get printed on the screen.

You can also run this example from the command line.

$ pwcpp-assistant --help

usage: pwcpp-assistant [-h] [-m MODEL] [-ind INPUT_DEVICE] [-st SILENCE_THRESHOLD] [-bd BLOCK_DURATION]

options:
  -h, --help            show this help message and exit
  -m MODEL, --model MODEL
                        Whisper.cpp model, default to tiny.en
  -ind INPUT_DEVICE, --input_device INPUT_DEVICE
                        Id of The input device (aka microphone)
  -st SILENCE_THRESHOLD, --silence_threshold SILENCE_THRESHOLD
                        he duration of silence after which the inference will be running, default to 16
  -bd BLOCK_DURATION, --block_duration BLOCK_DURATION
                        minimum time audio updates in ms, default to 30

---

• Check the examples folder for more examples.

Advanced usage

• First check the API documentation for more advanced usage.
• If you are a more experienced user, you can access the exposed C-APIs directly from the binding module _pywhispercpp.

import _pywhispercpp as pwcpp

ctx = pwcpp.whisper_init_from_file('path/to/ggml/model')

Discussions and contributions

If you find any bug, please open an issue.

If you have any feedback, or you want to share how you are using this project, feel free to use the Discussions and open a new topic.

License

This project is licensed under the same license as whisper.cpp (MIT License).