PHP正则匹配获取视频信息

   $video_info = shell_exec('ffmpeg -i input.mp4 2>&1');
    // 使用输出缓冲，获取ffmpeg所有输出内容
    $ret = array();
    // Duration: 00:33:42.64, start: 0.000000, bitrate: 152 kb/s
    if (preg_match("/Duration: (.*?), start: (.*?), bitrate: (\d*) kb\/s/", $video_info, $matches)){
        $ret['duration'] = $matches[1]; // 视频长度
        $duration = explode(':', $matches[1]);
        $ret['seconds'] = $duration[0]*3600 + $duration[1]*60 + $duration[2]; // 转为秒数
        $ret['start'] = $matches[2]; // 开始时间
        $ret['bitrate'] = $matches[3]; // bitrate 码率 单位kb
    }
    // Stream #0:1: Video: rv20 (RV20 / 0x30325652), yuv420p, 352x288, 117 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
    // Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 544x960, 1229 kb/s, 29.58 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
    if(preg_match("/Video: (.*?)[\s\(].*?, (.*?)[,\(].*?(\d*[x]\d*)[,\s]", $video_info, $matches)){
        $ret['vcodec'] = $matches[1];     // 编码格式
        $ret['vformat'] = $matches[2];    // 视频格式
        $ret['resolution'] = $matches[3]; // 分辨率
        list($width, $height) = explode('x', $matches[3]);
        $ret['width'] = $width;
        $ret['height'] = $height;
    }
    // Stream #0:0: Audio: cook (cook / 0x6B6F6F63), 22050 Hz, stereo, fltp, 32 kb/s
    if(preg_match("/Audio: (.*), (\d*) Hz/", $video_info, $matches)){
        $ret['acodec'] = $matches[1];      // 音频编码
        $ret['asamplerate'] = $matches[2]; // 音频采样频率
    }
    //旋转度数
    if (preg_match("/rotate\s*:\s(\d*)/", $video_info, $matches)) {
                if ($matches[1] > 0) $rotate = intval($matches[1]);
            }
    if(isset($ret['seconds']) && isset($ret['start'])){
        $ret['play_time'] = $ret['seconds'] + $ret['start']; // 实际播放时间
    }
 
    $ret['size'] = filesize($file); // 视频文件大小