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")?@unlink($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) {
}
}