i'm trying to implement google speech to text for live audio streams. I have been able to implement for location audio file correctly. However, live audio content is not successful.

I am using V1 of the speech-to-text api. I have gRPC installed already.

This is my PHP script

require 'vendor/autoload.php';
$conn= new mysqli('localhost',"", "", "");

use Google\Cloud\Speech\V1\SpeechClient;
use Google\Cloud\Speech\V1\RecognitionConfig;
use Google\Cloud\Speech\V1\RecognitionAudio;
use Google\Cloud\Speech\V1\StreamingRecognitionConfig;
use Google\Cloud\Speech\V1\StreamingRecognizeRequest;
use Google\Cloud\Speech\V1\StreamingRecognizeResponse;
use Google\Cloud\Speech\V1\StreamingRecognitionResult;
use Google\Cloud\Speech\V1\SpeechContext;
use Google\Cloud\Speech\V1\SpeakerDiarizationConfig;
use Google\Cloud\Speech\V1\WordInfo;
use Google\Cloud\Speech\V1\RecognitionConfig\AudioEncoding;

putenv('GOOGLE_APPLICATION_CREDENTIALS=' . __DIR__ . '/xxx-455121-be3eb805f1d7.json');


$ffmpegCommand = "ffmpeg -re -i  -ac 1 -ar 16000 -f s16le pipe:1";
$handle = popen($ffmpegCommand, "r");

try {
    $client = new SpeechClient(['transport' => 'grpc', 'credentials' => json_decode(file_get_contents(getenv('GOOGLE_APPLICATION_CREDENTIALS')), true)]);
} catch (Exception $e) {
    echo 'Error: ' . $e->getMessage(); 
    exit;
}

$encoding = AudioEncoding::MP3;
try {
$config = (new RecognitionConfig())
        ->setEncoding($encoding)
        ->setSampleRateHertz(24000)
        ->setLanguageCode('en-US')
        ->setEnableAutomaticPunctuation(true);
} catch (Exception $e) {
    echo 'Error: ' . $e->getMessage(); 
    exit;
}

try {
    $streamConfig = new StreamingRecognitionConfig([
        'config' => $config,
        'interim_results' => true,
    ]);
} catch (Exception $e) {
    echo 'Error: ' . $e->getMessage();
    exit;
}
try {
    $stream = $client->streamingRecognize();
    $stream->write(new StreamingRecognizeRequest([
        'streaming_config' => $streamConfig
    ]));
} catch (Exception $e) {
    echo 'Error: ' . $e->getMessage(); 
    exit;
}


while (!feof($handle)) {
    usleep(5000);
    $chunk = fread($handle, 4096);
    printf('chunk: ' . $chunk);
    if ($chunk !== false) {
        try {
            $stream->write(new StreamingRecognizeRequest([
                'audio_content' => $chunk
            ]));
        } catch (Exception $e) {
            printf('Errorc: ' . $e->getMessage());
        }
    }
}

print_r($stream->responses());
foreach ($stream->responses() as $response) {
    mysqli_query($conn, "INSERT INTO transcriptions (transcript) VALUES ('loop1')");
    foreach ($response->getResults() as $result) {
        mysqli_query($conn, "INSERT INTO transcriptions (transcript) VALUES ('loop2')");
        foreach ($result->getAlternatives() as $alternative) {
            $trans = $alternative->getTranscript();
            mysqli_query($conn, "INSERT INTO transcriptions (transcript) VALUES ('$trans')");
            printf('Transcript: %s' . PHP_EOL, $alternative->getTranscript());
            printf('loop');
        }
    }
}

pclose($handle);
$stream->close();
$client->close();

?>`

The script breaks at $chunk = fread($handle, 4096)

This is the error message

Please assist