Read wav audio files and get their audio chunks transcribed by Google Speech API in real time.
This program takes an audio file as an input and uses Google Speech API to output a text transcription. The audio file is read in real time (bitrate is taken from the .wav header information), and synchronized transcription requests are made to Google's server over the nodejs-speech NPM package.
version 5 and above should work
The GOOGLE_APPLICATION_CREDENTIALS must be properly set and point to a
valid service account file.
If you need to get service account, you need to :
- Create or select a project
- Enable the Cloud Speech API for that project
- Create a service account
- Download a private key as JSON
And then set the environment variable GOOGLE_APPLICATION_CREDENTIALS to the
file path of the JSON file that contains your service account key.
More info here : https://cloud.google.com/nodejs/
git clone https://github.com/phsultan/real-time-audio-transcription.git
cd real-time-audio-transcription
npm install
Usage: node readAndTranscribe.js [options] [filename]
finename Audio file to transcribe, a WAV container. If not
present, audio is read from standard input.
Options:
-l, --lang Transcription language code, e.g. : en-US, fr-FR.
Defaults to en-US.
-s, --silence Frames with energy under this value will be considered
to be silent. Defaults to 100 (purely arbitrary !).
-e, --eof The maximum number of tries to consider that the
end of file (EOF) has been reached. Useful if you run
this program to transcribe a file that is being
continuously fed with new audio data. Defaults to 4.
-m, --minaudio The minimum acceptable duration of speech to trigger
a recognition request. More audio data will be collected
if we're under this value before issuing a recognition
request. Defaults to 2 seconds.
-M, --maxaudio The maximum acceptable duration of speech to trigger
a recognition request. If we don't detect any silence
and the audio buffer is about to exceed this value,
then we force a recognition request to Google.
Defaults to 10 seconds.
-d, --debug Run in debug mode.
-h, --help Show this help message.
Read content from a local audio file /tmp/audio-content.wav, get a Spanish transcription :
$ node readAndTranscribe.js /tmp/audio-content.wav --lang=en-ES
Read content from a URL, transcribe with default options (US English transcription) :
$ curl -s -X GET 'http://mydomain.com/audio-content.wav' | node readAndTranscribe.js