用PHP在服务器上用ffmpeg进行视频转换，本地测试OK后，服务器出现错误

[小河]

Warning: proc_open() [function.proc-open]: CreateProcess failed in E:\showq\includes\class.movie2flv.php on line 46
success!
Warning: proc_open() [function.proc-open]: CreateProcess failed in E:\showq\includes\class.movie2flv.php on line 46
success

错误如上，估计是服务器配置问题

相关代码如下

require_once('class.movie2flv.php');

$arg = array(
	'ffmpeg' => 'D:\ffmpeg\Libs\ffmpeg.exe',
	'moviesrc' => 'E:\showq\upload\video\172.avi',
	'flv' => 'E:\showq\upload\video\172.flv',
	'logfile' => 'E:\showq\log.log',
	'pic' => 'E:\showq\upload\video\172.jpg',
	'flvwidth'=>'500',
	'flvheight'=>'400',
	'picheight'=>'110',
	'picwidth'=>'150'
);

$m2f = new movie2flv($arg);

$cmd = $m2f->getmoviecmd();
$m2f->run($cmd);

if($m2f->code){
	echo 'failed!';
}else{
	echo 'success!';
}

$piccmd = $m2f->getpiccmd();
$m2f->run($piccmd);
if($m2f->code){
	echo 'failed';
}else{
	echo 'success';
}

[小河]

proc_open()问题已经解决，是服务器权限问题
现在的问题是 服务器上用 cmd.exe运行可以，但是用PHP程序运行就不行