本文实例讲述了PHP从FLV文件获取视频预览图的方法。分享给大家供大家参考。具体实现方法如下：

复制代码 代码如下:<"00:00:01" (one second), no browser defaults to "true"
$videofile = (isset($_GET['file'])) "  File: ", $videofile);
// debug (" Image: ", $image);
// debug ("  Time: ", $time);
// check time format
if (!preg_match('/\d\d:\d\d:\d\d/', $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: ", $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'])) " 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");
}
?>

希望本文所述对大家的php程序设计有所帮助。