一个FFMPEG视频转换的PHP类

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<?php
class local_video
{
    public $options;
    public $ffmpeg;
    public $phpcms_path;
    public $backup;
    function __construct($options,$ffmpeg,$backup=true)
    {
        $this->options=pc_base::load_config('convert');
        $this->options = array_filter($options) + $this->options;
        $this->ffmpeg=$ffmpeg;	//ffmpeg路径
        $this->backup=$backup;
    }
    //获取视频信息
    function video_info($file)
    {
        ob_start();
        passthru(sprintf($this->ffmpeg . ' -i "%s" 2>&1', $file));//ffmpeg -i test.avi 2>&1
        $info = ob_get_contents();
        ob_end_clean();
        // 通过使用输出缓冲，获取到ffmpeg所有输出的内容。
        $ret  = array();
        // Duration: 01:24:12.73, start: 0.000000, bitrate: 456 kb/s
        if (preg_match("/Duration: (.*?), start: (.*?), bitrate: (\d*) kb\/s/",$info, $match))
        {
            $ret['duration'] = $match[1]; // 提取出播放时间
            $da              = explode(':', $match[1]);
            $ret['seconds']  = $da[0] * 3600 + $da[1] * 60 + $da[2]; // 转换为秒
            $ret['start']    = $match[2]; // 开始时间
            $ret['bitrate']  = $match[3]; // bitrate 码率 单位 kb
        }
        // Stream #0.1: Video: rv40, yuv420p, 512x384, 355 kb/s, 12.05 fps, 12 tbr, 1k tbn, 12 tbc
        if (preg_match("/Video: (.*?), (.*?), (.*?)[,\s]/", $info, $match))
        {
            $ret['vcodec']     = $match[1]; // 编码格式
            $ret['vformat']    = $match[2]; // 视频格式
            $ret['resolution'] = $match[3]; // 分辨率
            $a                 = explode('x', $match[3]);
            $ret['width']      = $a[0];
            $ret['height']     = $a[1];
        }
        // Stream #0.0: Audio: cook, 44100 Hz, stereo, s16, 96 kb/s
        if (preg_match("/Audio: (\w*), (\d*) Hz/", $info, $match))
        {
            $ret['acodec']      = $match[1];       // 音频编码
            $ret['asamplerate'] = $match[2];  // 音频采样频率
        }
        if (isset($ret['seconds']) && isset($ret['start']))
        {
            $ret['play_time'] = $ret['seconds'] + $ret['start']; // 实际播放时间
        }
        $ret['size'] = filesize($file); // 文件大小
        return $ret;
    }
    function convert()
    {
        $verifyToken = md5('unique_salt' . $this->options['timestamp']);
        if ($verifyToken == $this->options['token'])
        {
            $orgFile  = $this->options['org_path'] . $this->options['org'];
            $setting=' ';
            if(isset($this->options['video_size']))
                $setting=$setting.'-vf scale="'.$this->options['video_size'].'"';
            $mp4      = $this->ffmpeg . ' -i  '  . $orgFile . ' -ss 00:01:02 -vcodec libx264 -strict -2 '.$setting.' ' . $this->options['mp4_path_temp'] . $this->options['org'] . '';	//转换视频
            exec($mp4);
            if(isset($this->options['watermark'])){
            	$watermark=' "'.$this->options['watermark'].'" ';
            	$mp4 = $this->ffmpeg.' -i '.$this->options['mp4_path_temp'] . $this->options['org'] . ''.' -vf '.$watermark.' '.$this->options['mp4_path'] . $this->options['org'] . '';	//增加水印
            	exec($mp4);
            	@unlink($this->options['mp4_path_temp'] . $this->options['org'] . '');
            }
            $duration = $this->video_info($orgFile);
            $seconds  = intval($duration['seconds']);
            $offset   = intval($seconds / 21);	//截图间隔 秒
            $thumbs = explode(',', $this->options['thumb_size']);
            for ($i = 0; $i <= count($thumbs); $i++)
            {
                $targetPath = $this->options['thumb_path'] . $this->options['org'] . '/';
                if (!file_exists($targetPath))
                    @mkdir(rtrim($targetPath, '/'), 0777);
                if ($i == 0)
                {
                    $time     = 1;
                    $name     = $i == 0 ? 'default.jpg' : $i . '.jpg';
                    $img_size = $this->options['main_size'];
                }
                else
                {
	                $time       = $i * $offset;
	                $name       = $i . '.jpg';
	                $img_size   = $thumbs[$i-1];
                }
                $jpg = $this->ffmpeg . ' -i  ' . $orgFile . ' -f  image2  -ss ' . $time . ' -vframes 1  -s ' . $img_size . ' ' . $targetPath . $name;	//截图
                @exec($jpg);
            }
            //复制文件到对应的FTP服务器
            $ftp_server    = pc_base::load_config('ftp_server');
            $remote_server = $_POST['remote_server'];
            $ftp_server    = $ftp_server[$remote_server];
            if($ftp_server['ftp_server'])
                pc_base::ftp_upload($orgFile,
                                $ftp_server['ftp_server'],
                                $ftp_server['ftp_user_name'],
                                $ftp_server['ftp_user_pass']);
            //备份到所有FTP服务器
            if($this->backup){
                $ftp_backup = pc_base::load_config('ftp_backup');
                foreach ($ftp_backup as $v)
                {
                    pc_base::ftp_upload( $orgFile,
                                        $ftp_backup['ftp_server'],
                                        $ftp_backup['ftp_user_name'],
                                        $ftp_backup['ftp_user_pass']);
                }
            }
            $result['url']=$ftp_server['ftp_server']['http_address']. $this->options['mp4_path'] . $this->options['uniqid'] . '.mp4';//记录视频播放地址
            $result['uniqid']=$this->options['uniqid'];
            $result['videoTime'] = $this->video_info($orgFile);
            $result['videoTime'] = $result['videoTime']['seconds'];
            return $result;//返回处理结果
        }
        else
            die('验证失败！');
    }
}
?>

参考

http://www.fieryrain.com/blog/FFMPEG_VIDEO_TIME

http://keren.iteye.com/blog/1773536

http://www.cnblogs.com/dwdxdy/p/3240167.html

http://www.cnblogs.com/chen1987lei/archive/2010/12/03/1895242.html