Online převod flv do mp3.

   <?php       
        
        // On form submission...
        if ($_POST['submit'])
        {
            // Instantiate converter class
            include 'YouTubeToMp3Converter.class.php';
            $converter = new YouTubeToMp3Converter();            
            
            // Print "please wait" message and preview image
            $vidID = $vidTitle = '';
            $urlQueryStr = parse_url(trim($_POST['youtubeURL']), PHP_URL_QUERY);
            if ($urlQueryStr !== false && !empty($urlQueryStr))
            {
                $kvPairs = explode('&', $urlQueryStr);
                foreach ($kvPairs as $v)
                {
                    $kvPair = explode('=', $v);
                    if ($kvPair[0] == 'v')
                    {
                        $vidID = $kvPair[1];
                        break;
                    }
                }

                echo '<div id="preview" style="display:block"><p>...Please wait while I try to convert:</p>';
                echo '<p><img src="http://img.youtube.com/vi/'.$vidID.'/1.jpg" alt="preview image" /></p>';
                echo '<p>'.$converter->ExtractSongTrackName(trim($_POST['youtubeURL']), 'url').'</p></div>';
                flush();
            }
            
            // Main Program Execution
            if ($converter->DownloadVideo(trim($_POST['youtubeURL'])))
            {
                echo ($converter->GenerateMP3($_POST['quality'])) ? '<p>Success!</p>' : '<p>Error generating MP3 file!</p>';
            }
            else
            {
                echo '<p>Error downloading video!</p>';
            }
        }
    ?>
    <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
        <p>Enter a valid YouTube.com video URL:</p>
        <p><input type="text" name="youtubeURL" /></p>
        <p><i>(i.e., "<span style="color:red">http://www.youtube.com/watch?v=HMpmI2F2cMs</span>")</i></p>
        <p style="margin-top:20px">Choose the audio quality (better quality results in larger files):</p>
        <p style="margin-bottom:25px"><input type="radio" value="64" name="quality" />Low &nbsp; <input type="radio" value="128" name="quality" checked="checked" />Medium &nbsp; <input type="radio" value="320" name="quality" />High</p>
        <p><input type="submit" name="submit" value="Create MP3 File" /></p>
    </form>
    <script type="text/javascript">
        window.onload = function()
        {
            if (document.getElementById('preview'))
            {
                document.getElementById('preview').style.display = 'none';
            }
        };
    </script>

    // Conversion Class
    class YouTubeToMp3Converter
    {
        // Private Fields
        private $_songFileName = '';
        private $_flvUrl = '';
        private $_audioQualities = array(64, 128, 320);
        private $_tempVidFileName;
        private $_vidSrcTypes = array('source_code', 'url');

        // Constants
        const _TEMPVIDDIR = 'videos/';
        const _SONGFILEDIR = 'mp3/';
        const _FFMPEG = 'ffmpeg.exe';
        
        #region Public Methods
        function __construct()
        {
        }
        
        function DownloadVideo($youTubeUrl)
        {
            $file_contents = file_get_contents($youTubeUrl);
            if ($file_contents !== false)
            {
                $this->SetSongFileName($file_contents);
                $this->SetFlvUrl($file_contents);
                if ($this->GetSongFileName() != '' && $this->GetFlvUrl() != '')
                {
                    return $this->SaveVideo($this->GetFlvUrl());
                }
            }
            return false;
        } 
        
        function GenerateMP3($audioQuality)
        {
            $qualities = $this->GetAudioQualities();
            $quality = (in_array($audioQuality, $qualities)) ? $audioQuality : $qualities[1];            
            $exec_string = self::_FFMPEG.' -i '.$this->GetTempVidFileName().' -y -acodec libmp3lame -ab '.$quality.'k '.$this->GetSongFileName();
            exec($exec_string);
            $this->DeleteTempVid();
             return is_file($this->GetSongFileName());
        }
        
        function ExtractSongTrackName($vidSrc, $srcType)
        {
            $name = '';
            $vidSrcTypes = $this->GetVidSrcTypes();
            if (in_array($srcType, $vidSrcTypes))
            {
                $vidSrc = ($srcType == $vidSrcTypes[1]) ? file_get_contents($vidSrc) : $vidSrc;
                if ($vidSrc !== false && eregi('eow-title',$vidSrc))
                {
                    $name = end(explode('eow-title',$vidSrc));
                    $name = current(explode('">',$name));
                    $name = ereg_replace('[^-_a-zA-Z,"\' :0-9]',"",end(explode('title="',$name)));
                }
            }
            return $name;
        }        
        #endregion

        #region Private "Helper" Methods
        private function SaveVideo($url)
        {
            $this->SetTempVidFileName(time());
            $file = fopen($this->GetTempVidFileName(), 'w');
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_FILE, $file);
            curl_setopt($ch, CURLOPT_HEADER, 0);
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
            curl_setopt($ch, CURLOPT_COOKIEFILE, COOKIE);
            curl_setopt($ch, CURLOPT_COOKIEJAR, COOKIE);
            curl_exec($ch);
            curl_close($ch);
            fclose($file);
            return is_file($this->GetTempVidFileName());
        }
        
        private function DeleteTempVid()
        {
            if (is_file($this->GetTempVidFileName())) 
            {
                unlink($this->GetTempVidFileName());
            }        
        }
        #endregion
        
        #region Properties
        public function GetSongFileName()
        {
            return $this->_songFileName;
        }        
        private function SetSongFileName($file_contents)
        {
            $vidSrcTypes = $this->GetVidSrcTypes();
            $trackName = $this->ExtractSongTrackName($file_contents, $vidSrcTypes[0]);
            $this->_songFileName = (!empty($trackName)) ? self::_SONGFILEDIR . preg_replace('/_{2,}/','_',preg_replace('/ /','_',preg_replace('/[^A-Za-z0-9 _-]/','',$trackName))) . '.mp3' : '';
        }

        public function GetFlvUrl()
        {
            return $this->_flvUrl;
        }            
        private function SetFlvUrl($file_contents)
        { 
            $vidUrl = '';
            if (eregi('fmt_url_map',$file_contents))
            {
                $vidUrl = end(explode('&fmt_url_map=',$file_contents));
                $vidUrl = current(explode('&',$vidUrl));
                $vidUrl = current(explode('%2C',$vidUrl));
                $vidUrl = urldecode(end(explode('%7C',$vidUrl)));
            }
            $this->_flvUrl = $vidUrl;
        }
        
        public function GetAudioQualities()
        {
            return $this->_audioQualities;
        }    
        
        private function GetTempVidFileName()
        {
            return $this->_tempVidFileName;
        }
        private function SetTempVidFileName($timestamp)
        {
            $this->_tempVidFileName = self::_TEMPVIDDIR . $timestamp .'.flv';
        }
        
        public function GetVidSrcTypes()
        {
            return $this->_vidSrcTypes;
        }
        #endregion
    }