php结合ffmpeg转换视频,一段简单的代码，留作以后用途，ffmpeg转换参数命令
<?php
runExternal( "d:\web\demo\ffmpeg.exe -i d:\video\m013_the_real_on1.avi -b 360 -r 25 -s 320x240 -hq -deinterlace -ab 56 -ar 22050 -ac 1 d:\web\demo.flv 2>encode.txt \r\n start \B \WAIT d:\software\php\php.exe d:\web\demo\text.php", &$code );
if( $code ) echo "bad transcoding";
else echo "looks good";
function runExternal( $cmd, &$code ) {
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w"), // stdout is a pipe that the child will write to
2 => array("pipe", "w") // stderr is a file to write to
);
$pipes= array();
$process = proc_open($cmd, $descriptorspec, $pipes);
$output= "";
if (!is_resource($process)) return false;
#close child's input imidiately
fclose($pipes[0]);
stream_set_blocking($pipes[1],false);
stream_set_blocking($pipes[2],false);
$todo= array($pipes[1],$pipes[2]);
while( true ) {
$read= array();
if( !feof($pipes[1]) ) $read[]= $pipes[1];
if( !feof($pipes[2]) ) $read[]= $pipes[2];
if (!$read) break;
$ready= stream_select($read, $write=NULL, $ex= NULL, 2);
if ($ready === false) {
break; #should never happen - something died
}
foreach ($read as $r) {
$s= fread($r,1024);
$output.= $s;
}
}
fclose($pipes[1]);
fclose($pipes[2]);
$code= proc_close($process);
return $output;
}
?>
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