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FFmpeg VAD Streaming

Streaming inference from arbitrary source (FFmpeg input) to STT, using VAD (voice activity detection). A fairly simple example demonstrating the STT streaming API in Node.js.

This example was successfully tested with a mobile phone streaming a live feed to a RTMP server (nginx-rtmp), which then could be used by this script for near real time speech recognition.

Installation

npm install

Moreover FFmpeg must be installed:

sudo apt-get install ffmpeg

Usage

Here is an example for a local audio file:

node ./index.js --audio <AUDIO_FILE> \
                --model $HOME/models/model.tflite

Here is an example for a remote RTMP-Stream:

node ./index.js  --audio rtmp://<IP>:1935/live/teststream \
                 --model $HOME/models/model.tflite

Examples

Real time streaming inference with STT's example audio (audio-0.4.1.tar.gz).

node ./index.js --audio $HOME/audio/2830-3980-0043.wav \
                --scorer $HOME/models/kenlm.scorer \
                --model $HOME/models/model.tflite
node ./index.js --audio $HOME/audio/4507-16021-0012.wav \
                --scorer $HOME/models/kenlm.scorer \
                --model $HOME/models/model.tflite
node ./index.js --audio $HOME/audio/8455-210777-0068.wav \
                --scorer $HOME/models/kenlm.scorer \
                --model $HOME/models/model.tflite

Real time streaming inference in combination with a RTMP server.

node ./index.js --audio rtmp://<HOST>/<APP>/<KEY> \
                --scorer $HOME/models/kenlm.scorer \
                --model $HOME/models/model.tflite

Notes

To get the best result mapped on to your own scenario, it might be helpful to adjust the parameters VAD_MODE and DEBOUNCE_TIME.