发布于 2015-03-18 02:59:10 | 95 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的PHP面向对象编程,程序狗速度看过来!

PHP开源脚本语言

PHP(外文名: Hypertext Preprocessor,中文名:“超文本预处理器”)是一种通用开源脚本语言。语法吸收了C语言、Java和Perl的特点,入门门槛较低,易于学习,使用广泛,主要适用于Web开发领域。PHP的文件后缀名为php。


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:

代码如下:
 
<?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, 0, 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");
}
?>


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