title: FFMpeg : Add audio stream via -filter_complex
body: <p>In Reference to <a href="https://superuser.com/questions/833232/create-video-with-5-images-with-fadein-out-effect-in-ffmpeg">https://superuser.com/questions/833232/create-video-with-5-images-with-fadein-out-effect-in-ffmpeg</a>
  I have a bunch of images. and I want to make a video using these images.
  Below is my code for <code>FFMpeg</code>. But the problem is how can I append an audio file to <code>-filter_complex</code> (with bitrate)</p>
  
  <pre><code>ffmpeg \
  -loop 1 -i input0.png \
  -loop 1 -i input1.png \
  -loop 1 -i input2.png \
  -loop 1 -i input3.png \
  -loop 1 -i input4.png \
  -filter_complex \
  "[0:v]trim=duration=15,fade=t=out:st=14.5:d=0.5[v0]; \
   [1:v]trim=duration=15,fade=t=in:st=0:d=0.5,fade=t=out:st=14.5:d=0.5[v1]; \
   [2:v]trim=duration=15,fade=t=in:st=0:d=0.5,fade=t=out:st=14.5:d=0.5[v2]; \
   [3:v]trim=duration=15,fade=t=in:st=0:d=0.5,fade=t=out:st=14.5:d=0.5[v3]; \
   [4:v]trim=duration=15,fade=t=in:st=0:d=0.5,fade=t=out:st=14.5:d=0.5[v4]; \
   [v0][v1][v2][v3][v4]concat=n=5:v=1:a=0,format=yuv420p[v]" -map "[v]" out.mp4
  </code></pre>