使用PHP怎么从FLV文件中获取视频的预览图？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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('/\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, $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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