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Google Cloud Speech

These samples show how to use the Google Cloud Speech API to transcribe audio files.

  1. It takes mp4 files as argument
  2. Converts it to audio in FLAC encoding (lossless encoding ) and Breaks the audio file into 10 secs clips
  3. transcribes each 10 sec audio file and prints the speech to text result on console.

Pre-requisite

  1. Setup Google Cloud Speech Project
  2. Install ffmpeg on your machine (linux)

Installation

Install the dependencies for this library via composer

$ cd /path/to/speech_to_text
$ composer install

Configure your project using [Application Default Credentials]

$ export GOOGLE_APPLICATION_CREDENTIALS=/path/to/credentials.json

Usage

To run the Speech Samples:

$ php speech.php

Cloud Speech

Usage:
  command [options] [arguments]

Options:
  -h, --help            Display this help message
  -q, --quiet           Do not output any message
  -V, --version         Display this application version
      --ansi            Force ANSI output
      --no-ansi         Disable ANSI output
  -n, --no-interaction  Do not ask any interactive question
  -v|vv|vvv, --verbose  Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug

Available commands:
  help                    Displays help for a command
  list                    Lists commands
  transcribe              Transcribe an video file using Google Cloud Speech API

Help

  $ php speech.php transcribe --help

Usage:
    transcribe [options] [--] <video-file>

Arguments:
    video-file                   The video file to transcribe

Options:
    -l, --language=LANGUAGE      The language to transcribe [default: "en-US"]
    -e, --encoding=ENCODING      The encoding of the audio file. This is required if the encoding is unable to be determined. [default: 2]
    -b, --brand-file=BRAND-FILE  The brand names for speech context to transcribe [default: "brands"]
    -r, --rate-hertz=RATE-HERTZ  The sample rate (in Hertz) of the supplied video [default: 48000]
    -h, --help                   Display this help message
    -q, --quiet                  Do not output any message
    -V, --version                Display this application version
        --ansi                   Force ANSI output
        --no-ansi                Disable ANSI output
    -n, --no-interaction         Do not ask any interactive question
    -v|vv|vvv, --verbose         Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug

Help:
    Transcribe an video file using Google Cloud Speech API
    The transcribe command transcribes video from a file using the
    Google Cloud Speech API.
    
    php speech.php transcribe video_file.mp4

Just send the speech sample, send it through the speech API using the transcribe command:

php speech.php transcribe [path to audio/video file]