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:<?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 formatif (!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");}?>
希望本文所述对大家的php程序设计有所帮助。
