title: using FFMPEG with silencedetect to remove audio silence
body: <p>I am trying to use the following command with the latest ffmpeg build to remove silence from my .mp3 files:</p>
  
  <pre><code>ffmpeg -i SILENCE.mp3 -af silencedetect=n=-50dB:d=1 -y -ab 192k  SILENCE_OUT.mp3
  </code></pre>
  
  <p>However, the following output is produced:</p>
  
  <pre><code>ffmpeg version N-66154-g1654ca7 Copyright (c) 2000-2014 the FFmpeg developers
    built on Sep  5 2014 22:10:38 with gcc 4.8.3 (GCC)
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-lib
  modplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
  b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
  r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
  able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
   --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
  libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
    libavutil      54.  7.100 / 54.  7.100
    libavcodec     56.  1.100 / 56.  1.100
    libavformat    56.  4.100 / 56.  4.100
    libavdevice    56.  0.100 / 56.  0.100
    libavfilter     5.  1.100 /  5.  1.100
    libswscale      3.  0.100 /  3.  0.100
    libswresample   1.  1.100 /  1.  1.100
    libpostproc    53.  0.100 / 53.  0.100
  Input #0, mp3, from 'SILENCE.mp3':
    Metadata:
      title           : Snowblind (Featuring Tasha Baxter)
      artist          : Au5
      album           : Snowblind (Featuring Tasha Baxter)
      genre           : Electronica
      performer       : Au5
      track           : 1/1
      date            : 2014
      album_artist    : Au5,Tasha Baxter
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      encoder         : Lavf55.42.100
    Duration: 00:05:50.80, start: 0.025057, bitrate: 192 kb/s
      Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
  Output #0, mp3, to 'SILENCE_OUT.mp3':
    Metadata:
      TIT2            : Snowblind (Featuring Tasha Baxter)
      TPE1            : Au5
      TALB            : Snowblind (Featuring Tasha Baxter)
      TCON            : Electronica
      TPE3            : Au5
      TRCK            : 1/1
      TDRL            : 2014
      TPE2            : Au5,Tasha Baxter
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: isommp42
      TSSE            : Lavf56.4.100
      Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p, 192 kb/s
      Metadata:
        encoder         : Lavc56.1.100 libmp3lame
  Stream mapping:
    Stream #0:0 -&gt; #0:0 (mp3 (native) -&gt; mp3 (libmp3lame))
  Press [q] to stop, [?] for help
  [silencedetect @ 0000000004398f40] silence_start: -0.00628118
  [silencedetect @ 0000000004398f40] silence_end: 3.21413 | silence_duration: 3.22
  041
  [silencedetect @ 0000000004398f40] silence_start: 343.844
  [libmp3lame @ 00000000043b2940] Trying to remove 1152 samples, but the queue is
  empty
  size=    8223kB time=00:05:50.79 bitrate= 192.0kbits/s
  video:0kB audio:8222kB subtitle:0kB other streams:0kB global headers:0kB muxing
  overhead: 0.011485%
  </code></pre>
  
  <p>The generated audio file however still has the original length without any silence removed.
  See the following images:
  <img src="https://i.stack.imgur.com/SpkmM.png" alt="http://i.imgur.com/nVxe5lX.png"></p>
  
  <p>Any help is appreciated!</p>
  
  <p><strong>EDIT:</strong>
  Alright, silence detect is only DETECTING the silence. Not removing it. I will try to post a solution for this.</p>