title: ffmpeg remove all silent parts from audio file
body: <p>I would like to cut the silent parts (where my prof writes on the blackboard but does not talk) off from my lecture notes. I tried <code>ffmpeg -i input.mp3 -af silenceremove=1:0:-50dB output.mp3</code> <a href="https://stackoverflow.com/questions/25697596/using-ffmpeg-with-silencedetect-to-remove-audio-silence">from this post</a>, but it only deletes silence from the beginning of my file.</p>
  <p>Can I delete the silence everywhere with one command? I only want the speech without all the writing on the blackboard. Thank you!</p>