title: FFmpeg append Audio duration to File Name
body: <p>I'm working on processing some audio files, I'm to get the audio duration and append the duration to the file name i.e <code>audio-lecture-02.30.05.mp3</code>.I have able to get the audio duration using FFmpeg using <code>ffmpeg -i lecture.mp3 2&gt;&amp;1 | grep Duration</code> and the output is <code>Duration: 01:27:25.70, start: 0.000000, bitrate: 64 kb/s</code> is there a way to extract this duration and append the file name? 
  Thanks in advance.</p>