如何使用php转换视频为mp4并获取预览图？本文呢主要介绍了php实现将视频转成mp4并获取视频预览图的方法，涉及php操作视频文件的技巧。希望对大家有所帮助。
<?php
flv_convert_get_thumb('input.avi', 'output.jpg', 'output.ogm');
// code provided and updated by steve of phpsnaps ! thanks
// accepts:
// 1: the input video file
// 2: path to thumb jpg
// 3: path to transcoded mpeg?
function flv_convert_get_thumb($in, $out_thumb, $out_vid)
{
// get thumbnail
$cmd = 'ffmpeg -v 0 -y -i '.$in.' -vframes 1 -ss 5 -vcodec mjpeg -f rawvideo -s 286x160 -aspect 16:9 '.$out_thumb;
$res = shell_exec($cmd);
// $res is the output of the command
// transcode video
$cmd = 'mencoder '.$in.' -o '.$out_vid.' -af volume=10 -aspect 16:9 -of avi -noodml -ovc x264 -x264encopts bitrate=500:level_idc=41:bframes=3:frameref=2: nopsnr: nossim: pass=1: threads=auto -oac mp3lame';
$res = shell_exec($cmd);
}
?> 
