PHP实现将视频转成MP4并获取视频预览图的方法

<?php
flv_convert_get_thumb(&#39;input.avi&#39;, &#39;output.jpg&#39;, &#39;output.ogm&#39;);
// 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
  $cmd = &#39;ffmpeg -v 0 -y -i &#39;.$in.&#39; -vframes 1 -ss 5 -vcodec mjpeg -f rawvideo -s 286x160 -aspect 16:9 &#39;.
  $out_thumb;
  $res = shell_exec($cmd);
  // $res is the output of the command
  // transcode video
  $cmd = &#39;mencoder &#39;.$in.&#39; -o &#39;.
  $out_vid.&#39; -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&#39;;
  $res = shell_exec($cmd);
}
?>