How to use php to operate flv files to obtain screenshots

This article mainly introduces the method of PHP to obtain the video preview from the FLV file. It analyzes the techniques of operating the flv file to obtain screenshots with PHP. It has certain reference value. Friends who need it can refer to it

The example in this article describes how PHP obtains a video preview from an FLV file. The specific implementation method is as follows:

The code is as follows:

<?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[&#39;file&#39;])) ? strval($_GET[&#39;file&#39;]) : &#39;video.flv&#39;;
$image = substr($videofile, 0, strlen($videofile) - 4);
$time = (isset($_GET[&#39;time&#39;])) ? strval($_GET[&#39;time&#39;]) : &#39;00:00:01&#39;;
// debug ("  File: ", $videofile);
// debug (" Image: ", $image);
// debug ("  Time: ", $time);
// check time format
if (!preg_match(&#39;/\d\d:\d\d:\d\d/&#39;, $time))
{
  $time = "00:00:00";
}
if (isset($_GET[&#39;percent&#39;]))
{
  $percent = $_GET[&#39;percent&#39;];
// 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(&#39;/Duration: (.*?),/&#39;, $duration, $matches);
  $duration = $matches[1];
// debug ("Duration: ", $duration);
  $duration_array = split(&#39;:&#39;, $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[&#39;browser&#39;])) ? strval($_GET[&#39;browser&#39;]) : &#39;true&#39;;
// debug (" Browser: ", $browser);
if ($browser == "true")
{
  header(&#39;Content-Type: image/png&#39;);
  exec("/usr/bin/ffmpeg -vcodec png -i \"" . $videofile . "\" -ss " . $time . " -vframes 1 -f image2 -");
//header(&#39;Content-Type: image/jpeg&#39;);
//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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