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? ? 在这里简要介绍一下搭建视频网站所需要的软件，这些软件包括ffmpeg、mplayer。它们主要用来负责视频的转码工作，ffmpeg基本上对所有格式的视频文件都可以处理，但是对rmvb和rm格式的视频无法转码，这个时候，就需要通过MPlayer转码工具的协助，完成转码任务。

? ? 如果要在网页上播放，就需要转码。如果采用flash播放器播放视频，这个时候就需要转码出flv格式的视频；如果采用html5或者pad播放，就需要转码出MP4格式的视频。在转码的处理中，我们通常会分别转码出两种视频，分别是高清和流畅视频，方便不同网速的用户观看。class VideoConvert{//视频的原始文件var $src;//后缀名var $suffix;//视频实际类型var $format;//视频md5value: 在tester中主要用于生成同级目录下的缩略图的初始位置var $md5value;//视频长度var $ori_length;//视频信息var $src_identify = array();//错误日志var $err_log = array();//指令地址var $system_mencoder = '/usr/bin/mencoder ';var $system_ffmpeg = '/usr/local/bin/ffmpeg ';var $system_mplayer = '/usr/bin/mplayer ';var $system_yamdi = '/usr/local/bin/yamdi ';var $system_qtfaststart = '/usr/local/bin/qt-faststart ';function __construct($filePath) {$this->src = $filePath;//源文件不存在if (!file_exists($this->src)) {print_r("the file[$this->src] not exists.\r\n

");} else {print_r("the file[$this->src] exists.\r\n

");}}function init() {//截取后缀名$this->suffix = strtolower(substr($this->src, strrpos($this->src, '.'))); //读取文件内容的前3个字节，判断真实文件格式$handle = fopen($this->src, 'r'); $this->format = strtolower(fread($handle, 3)); fclose($handle);//视频的md5值$this->md5value = md5_file( $this->src );//inentify$this->src_identify =$this->getIdentify($this->src);//视频长度$this->ori_length = $this->src_identify['id_length'];$this->ori_length = empty($this->ori_length)?0:$this->ori_length;}function showInfo() {$this->pr("后缀类型：$this->suffix");$this->pr("实际类型：$this->format");$this->pr("md5value：$this->md5value");$this->pr("ori_length：$this->ori_length");$this->pr("id_demuxer：".$this->src_identify['id_demuxer']);$this->pr("id_video_format：".$this->src_identify['id_video_format']);}function rmvb2avi($src, $dst, $identify) {//$cmd = $this->system_mencoder." $src -o ".$src."_ -of avi -oac mp3lame -ovc xvid -xvidencopts bitrate=$datarate";if($identify['id_video_format'] == 'WMV3') {$cmd = $this->system_mencoder." $src -o $dst -of avi -oac mp3lame -ovc copy";} else {$cmd = $this->system_mencoder." $src -o $dst -of avi -oac mp3lame -ovc xvid -xvidencopts fixed_quant=11";}$this->pr($cmd);$handle = @popen($cmd, 'r');while (!feof($handle)) {$line = fgets($handle, 1024);}@pclose($handle);return true;}function video2f4v($src, $dst, $datarate) {$cmd = $this->system_ffmpeg." -i ".$src." -f flv -acodec libfaac -ab 16k -vcodec libx264 -coder 1 -g 250 -keyint_min 25 -sc_threshold 40 -bf 3 -b_strategy 1 -partitions +parti8x8+parti4x4+partp8x8+partb8x8 -directpred 1 -flags +loop -deblockalpha 0 -deblockbeta 0 -flags2 +fastpskip+wpred-dct8x8 -me_method hex -me_range 16 -subq 6 -trellis 1 -b ".$datarate."k -qcomp 1 -i_qfactor 0.71 -qmin 10 -qmax 51 -qdiff 4 -r 29.97 -y ".$dst;//." 2>&1";$this->pr($cmd);$handle = @popen($cmd, 'r');while(!feof($handle)) {$line = fgets($handle, 1024);}@pclose($handle);return true;}function video2flv($src, $dst) {$cmd = $this->system_ffmpeg." -i $src -f flv -vcodec flv -ar 22050 -acodec libmp3lame -y $dst";// 2>&1";$this->pr($cmd);$handle = @popen($cmd, 'r');while(!feof($handle)) {$line = fgets($handle, 1024);}@pclose($handle);return true;}//转换mp4供iphone和ipad看function video2mp4($src, $dst, $rate) {file_exists($dst.".mp4")[email protected]($dst.".mp4"):'';$cmd = $this->system_ffmpeg." -threads 4 -i ".$src." -r 29.97 -vcodec libx264 -flags +loop -cmp +chroma -deblockalpha 0 -crf 24 -bt ".$rate."k -refs 1 -coder 0 -subq 5 -partitions +parti4x4+parti8x8+partp8x8 -g 250 -keyint_min 25 -level 30 -qmin 10 -qmax 51 -trellis 2 -sc_threshold 40 -i_qfactor 0.71 -acodec libfaac -ab 128k -ar 48000 -f mp4 ".$dst.".mp4";//2>&1";$this->pr($cmd);$handle = @popen($cmd, 'r');while(!feof($handle)) {$line = fgets($handle, 1024);}@pclose($handle);$mp4identify = $this->getIdentify($dst.".mp4");$mp4le = abs($mp4identify['id_length']);if($mp4le>0) {$cmd = $this->system_qtfaststart." ".$dst.".mp4 ".$dst.".mp4-new"." 2>&1";$handle = @popen($cmd, 'r');while(!feof($handle)) {$line = fgets($handle, 1024);}@pclose($handle);$mp4identify = $this->getIdentify($dst.".mp4-new");$mp4le = abs($mp4identify['id_length']);if ($mp4le>0) {unlink($dst.".mp4");rename($dst.".mp4-new",$dst.".mp4");}}return true;}/** * grabImage 抓图-ok * * @param string $src 源文件 * @param string $dst 目标文件 * @param int $length 时长 * @param int $pic_count 截图数量 * @access public * @return void */function grabImage($src, $dst, $length,$pic_count) {$grabRes = $this->grabImageFfmpeg($src, $dst, $length,$pic_count); if (@!filesize($dst)) { return false; }return $grabRes;}/** * grabImageFfmpeg 通过ffmpeg抓图-ok * * @param string $src 源文件 * @param string $dst 目标文件 * @access public * @return void */function grabImageFfmpeg($src, $dst, $length,$pic_count) {//在视频中间截图$ss = $length/2;$cmd = $this->system_ffmpeg ." -y -i $src -vframes 1 -ss $ss -an -vcodec mjpeg -f rawvideo $dst 2>&1";$fd = @popen($cmd, 'r');while (!feof($fd)) {$line = fgets($fd, 1024);}@pclose($fd);$count = $pic_count+1;if ($length>$count) {$s = $length/$count;for ($i=1;$isystem_ffmpeg ." -y -i $src -vframes 1 -ss ".($i*$s)." -an -vcodec mjpeg -f rawvideo $dstpic 2>&1";$fd = @popen($cmd, 'r');while (!feof($fd)) {$line = fgets($fd, 1024);}fclose($fd);}}return true;}/*** resizeImage从一个已有图片建立一个新的图片-ok * @param string $src 源文件 * @param string $obj 目标文件 * @param string $width 目标文件宽 * @param string $height 目标文件高 * @access public*/function resizeImage($src, $obj, $width, $height) {list($width_orig, $height_orig, $type_orig) = getimagesize($src);if ($width && ($width_orig < $height_orig)) {$width = ($height / $height_orig) * $width_orig;} else {$height = ($width / $width_orig) * $height_orig;}switch($type_orig) {case 1: $image = imagecreatefromgif($src);break;case 2: $image = imagecreatefromjpeg($src);break;case 3: $image = imagecreatefrompng($src);break;default:return false;}$image_p = imagecreatetruecolor($width, $height);imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);imagejpeg($image_p, $obj);return true;}/** * injectMetaData 向flv文件添加元数据-ok * 以支持播放器的拖放 * 返回flv时长 * @param string $file * @access public * @return init or false, if failed */function injectMetaData($file) {$info = array('code'=>false, 'msg'=>'未开始');//文件是否存在if (!file_exists($file)) {$info['msg'] = '文件不存在。';return $info;}$cmd = $this->system_yamdi . " -i $file -o ".$file."_ | grep lasttimestamp";$fd = @popen($cmd, 'r'); $lasttimestamp = 0;while (!feof($fd)) {$line = fgets($fd, 1024); if (strpos($line, ':')) { $lasttimestamp = substr($line, strpos($line, ':') + 1); }}pclose($fd);$l = $this->getIdentify($file.'_');if ($l['id_length']) {unlink($file);rename($file.'_',$file);}//Logger::trace(sprintf('lasttimestamp: %s', $lasttimestamp));//Logger::debug('Inject End');if ($lasttimestamp == '' || $lasttimestamp == 0){$lasttimestamp = $this->getIdentify($file);}return $lasttimestamp['id_length'];}function pr($msg) {echo "$msg\r\n

";}/** * getIdentify 获取视频信息-ok * @access public * @return void */function getIdentify($file) {$identify = array();if (!is_readable($file)) {return false;}$cmd = $this->system_mplayer . " -msglevel all=0 -identify -vc dummy -endpos 00:00:00 $file 2>&1";$fd = @popen($cmd, 'r');while (!feof($fd)) {$line = fgets($fd);if (strpos($line, 'ID_') === 0) {$line = explode('=', $line);$line[0] = strtolower($line[0]);$identify[$line[0]] = trim($line[1]);}}@pclose($fd);//假如mplayer没有获取到视频长度就用ffmpeg再次获取//视频长度$return = $identify['id_length'];if ($return == '' || !is_numeric($return)){//再次获取$cmd = $this->system_ffmpeg . " -i $file 2>&1";$fd = @popen($cmd, 'r');while (!feof($fd)) {$line = fgets($fd);$line = trim($line);$line = strtolower($line);if (strpos($line, 'duration:') === 0) {$line = explode(',', $line);$line = explode(':', $line[0]);$identify['id_length'] = abs($line[1])*3600+abs($line[2])*60+abs(((int)$line[3]));break;}}}return $identify;}function log($key, $value) {}}

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