title: FFMPEG Channel Mapping
body: <p>I have a 24 bit WAV file that consists of 8 channels. What I need to do is convert it into 4 24 bit two channel files where the output wavs are made up of source channels (1,2), (3,4), (5,6), (7,8).</p>
  
  <p>Anyone have any thoughts of the best way to do that using FFmpeg? </p>