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Google speech API - php returns nothing

My code is inspired by this version of the PHP version of the full-duplex speech API for speech-text: http://mikepultz.com/2013/07/google-speech-api-full-duplex-php-version/

I have several flac files that work and give the result of an array, as described in Mike's post. But for multiple flac files, it just returns nothing as output. For example: http://gavyadhar.com/video/upload/Pantry_Survey.flac , the result is not returned.

But the same code works for this flac file: http://gavyadhar.com/video/upload/pantry_snack_video.flac and returns the output of the array as follows:

--------- Answer 1: your face is a pantry and one of the main stacks. I usually reusable Wesley Rd rasa crackers, and I like them because they are pretty healthy for you and [...] ... etc. 5 answers.

Can someone tell me why some flac files do not work? Or is there a way to catch exceptions thrown by the Google API and display them for troubleshooting?

Thank. Attaching my code here to two php files:

PHP file which passes the API key and the FLAC file with its sample rate. 

<?php
include 'GoogleSpeechToText.php';


ini_set('display_errors',1);
ini_set('display_startup_errors',1);
error_reporting(-1); 		

// Your API Key goes here.
$apiKey = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX'; // my API server key
$speech = new GoogleSpeechToText($apiKey);

#var_dump($speech);

$file = realpath('upload/Pantry_Survey.flac'); // Full path to the file.

echo "<BR><BR>file : ", $file ;

#print_r("<br>-------------------");
#print_r($file1);
#print_r("<br>-------------------");

$bitRate = 44100; // The bit rate of the file.
$result = $speech->process($file, $bitRate, 'en-US');

print_r($result);

echo "<BR><BR>-------------";

$responses = $result[0]['alternative'];

$i = 0;
foreach ($responses as $response) {
	$i = $i + 1;
	#echo $response['transcript'];
	echo "<br><br> ---------response $i : ", $response['transcript'];
	
}

?>
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GoogleSpeechToText.php

<?php
/**
 * Convert FLAC files to Text using the Google Speech API
 *
 * Credit due to Mike (mike@mikepultz.com) for his first version of this.
 *
 * @version 0.1
 * @author Roger Thomas
 * @see
 *
 */
class GoogleSpeechToText
{
    /**
     * URL of the Speech API
     * @var string
     */
    const SPEECH_BASE_URL = 'https://www.google.com/speech-api/full-duplex/v1/';

	
	
    /**
     * A 'unique' string to use for the requests
     *
     * @var string
     */
    private $requestPair;

    /**
     * The Google Auth API Key
     *
     * @var string
     */
    private $apiKey;

    /**
     * CURL Upload Handle
     *
     * @var resource
     */
    private $uploadHandle;

    /**
     * CURL Download Handle
     *
     * @var resource
     */
    private $downloadHandle;

    /**
     * Construct giving the Google Auth API Key.
     *
     * @param string $apiKey
     * @throws Exception
     */
    public function __construct($apiKey)
    {
        if (empty($apiKey)) {
            throw new Exception('$apiKey should not be empty.');
        }
        $this->apiKey = $apiKey;
        $this->requestPair = $this->getPair();
        $this->setupCurl();
    }

    /**
     * Setup CURL requests, both up and down.
     */
    private function setupCurl()
    {
        $this->uploadHandle = curl_init();
        $this->downloadHandle = curl_init();
        
		curl_setopt($this->downloadHandle, CURLOPT_URL, self::SPEECH_BASE_URL . 'down?pair=' . $this->requestPair );
		
		#echo "<br>downloadHandle :: ", self::SPEECH_BASE_URL . 'down?pair=' . $this->requestPair;

        curl_setopt($this->downloadHandle, CURLOPT_RETURNTRANSFER, true);

        curl_setopt($this->uploadHandle,CURLOPT_RETURNTRANSFER,true);

        curl_setopt($this->uploadHandle,CURLOPT_POST,true);
		
		//----added by asmi shah - 7 jan 2015
		curl_setopt($this->uploadHandle, CURLOPT_MAX_SEND_SPEED_LARGE, 30000);
		curl_setopt($this->uploadHandle, CURLOPT_LOW_SPEED_TIME, 9999);
		curl_setopt($this->downloadHandle, CURLOPT_LOW_SPEED_TIME, 9999);
		//----

    }

    /**
     * Generate a Pair for the request. This identifies the requests later.
     *
     * @return string
     */
    private function getPair()
    {
        $c = '0123456789';
        $s = '';
        for ($i=0; $i<16; $i++) {
            $s .= $c[rand(0, strlen($c) - 1)];
        }
		echo "pair : ",$s;
        return $s;
		
    }

    /**
     * Make the request, returning either an array, or boolean false on
     * failure.
     *
     * @param string $file the file name to process
     * @param integer $rate the bitrate of the flac content (example: 44100)
     * @param string $language the ISO language code
     *      (en-US has been confirmed as working)
     * @throws Exception
     * @return array|boolean false for failure.
     */
    public function process($file, $rate, $language = 'en-US')
    {
        if (!$file || !file_exists($file) || !is_readable($file)) {
            throw new Exception(
                '$file must be specified and be a valid location.'
            );
        }
		else { echo "<br>file exists"; }

        $data = file_get_contents($file);
		
		#var_dump($rate);
        if (!$data) {
            throw new Exception('Unable to read ' . $file);
        }
		else { echo "<br>file is readable"; }
		
		
		$upload_data = array(
					"Content_Type"  =>  "audio/x-flac; rate=". $rate,
					"Content"       =>  $data,
		);
		

        if (empty($rate) || !is_integer($rate)) {
            throw new Exception('$rate must be specified and be an integer');
        }
		else { echo "<br>sample rate is received :" . $rate ; }

        curl_setopt($this->uploadHandle,CURLOPT_URL,self::SPEECH_BASE_URL . 'up?lang=' .$language . '&lm=dictation&timeout=20&client=chromium&pair=' .$this->requestPair . '&key=' . $this->apiKey);
        
		curl_setopt($this->uploadHandle,CURLOPT_HTTPHEADER,array('Transfer-Encoding: chunked','Content-Type: audio/x-flac; rate=' . $rate));
        
		curl_setopt($this->uploadHandle,CURLOPT_POSTFIELDS,$upload_data);
		
		#echo "<br><br>------ data : ", $data;
		#echo "<br><br>------";
		#echo "<BR><BR> URL made up : ", self::SPEECH_BASE_URL . 'up?lang=' .$language . '&lm=dictation&client=chromium&pair=' .$this->requestPair . '&key=' . $this->apiKey;
		

        $curlMulti = curl_multi_init();

        curl_multi_add_handle($curlMulti, $this->downloadHandle);
        curl_multi_add_handle($curlMulti, $this->uploadHandle);
		
        $active = null;
        do {
            curl_multi_exec($curlMulti, $active);
        } while ($active > 0);

        $res = curl_multi_getcontent($this->downloadHandle);

		#var_dump($this->downloadHandle);
		#echo "resource type ::".get_resource_type($this->downloadHandle);
        
		$output = array();
        $results = explode("\n", $res);
		
		
		#var_dump($results);
		#$i = 0;
        foreach ($results as $result) {
			#$i = $i + 1;
			#echo "<BR><BR><BR>--------------- string ||$i|| : ", $result;
			
            $object = json_decode($result, true);
            if (
                (isset($object['result']) == true) &&
                (count($object['result']) > 0)
            ) {
                foreach ($object['result'] as $obj) {
                    $output[] = $obj;
                }
            }
        }

        curl_multi_remove_handle($curlMulti, $this->downloadHandle);
        curl_multi_remove_handle($curlMulti, $this->uploadHandle);
        curl_multi_close($curlMulti);

        if (empty($output)) {
			echo "<BR><br>output is empty<BR>";
            return false;
        }
		echo "<BR><BR>";
        return  $output;
    }

    /**
     * Close any outstanding connections in the destruct
     */
    public function __destruct()
    {
        curl_close($this->uploadHandle);
        curl_close($this->downloadHandle);
    }
}

?>
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