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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[$this->src] not exists.\r\n<br>"); } else { print_r("the file[$this->src] exists.\r\n<br>"); } } 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 ($i=1;$i<$count;$i++) { $dstpic = $dst.'.'.$i.'.jpg'; $cmd = $this->system_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 "$msg\r\n<br>"; } /** * getIdentify 获取视频信息-ok * @access public * @return void */ function getIdentify($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) { }}Copy after login
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