PHP编程：PHP从FLV文件获取视频预览图的方法

<?php
// references http://www.longtailvideo.com/support/forum/Modules/12661/External-PHP-with-FFmpeg-using-readfile-
// generate a preview image from an FLV file on-the-fly,or to save
// call with: ffmpeg_image.php?file=video.flv&time=00:00:05&browser=true
// call with: ffmpeg_image.php?file=video.flv&percent=75.3&browser=true
// no time defaults to "00:00:01" (one second),no browser defaults to "true"
$videofile = (isset($_GET['file'])) ? strval($_GET['file']) : 'video.flv';
$image = substr($videofile,strlen($videofile) - 4);
$time = (isset($_GET['time'])) ? strval($_GET['time']) : '00:00:01';
// debug ("? File: ",$videofile);
// debug (" Image: ",$image);
// debug ("? Time: ",$time);
// check time format
if (!preg_match('/dd:dd:dd/',$time))
{
? $time = "00:00:00";
}
if (isset($_GET['percent']))
{
? $percent = $_GET['percent'];
// debug (" Percent: ",$percent);
? ob_start();
? exec("/usr/bin/ffmpeg -i "". $videofile . "" 2>&1");
? $duration = ob_get_contents();
? ob_end_clean();
? // debug ("Duration: ",$duration);
? preg_match('/Duration: (.*?),/',$duration,$matches);
? $duration = $matches[1];
// debug ("Duration: ",$duration);
? $duration_array = split(':',$duration);
? $duration = $duration_array[0] * 3600 + $duration_array[1] * 60 + $duration_array[2];
? $time = $duration * $percent / 100;
// debug (" Time: ",$time);
? $time = intval($time/3600) . ":" . intval(($time-(intval($time/3600)*3600))/60) . ":" . sprintf("%01.3f",($time-(intval($time/60)*60)));
// debug (" Time: ",$time);
}
$browser = (isset($_GET['browser'])) ? strval($_GET['browser']) : 'true';
// debug (" Browser: ",$browser);
if ($browser == "true")
{
? header('Content-Type: image/png');
? exec("/usr/bin/ffmpeg -vcodec png -i "" . $videofile . "" -ss " . $time . " -vframes 1 -f image2 -");
//header('Content-Type: image/jpeg');
//exec("/usr/bin/ffmpeg -vcodec mjpeg -i "" . $videofile . "" -ss " . $time . " -vframes 1 -f image2 -");
}
else
{
? exec("/usr/bin/ffmpeg -vcodec png -i "" . $videofile . "" -ss " . $time . " -vframes 1 -f image2 "" . $image . ""%d.png");
//exec("/usr/bin/ffmpeg -vcodec mjpeg -i "" . $videofile . "" -ss " . $time . " -vframes 1 -f image2 "" . $image . ""%d.jpg");
}
?>