title: chromakey: ffmpeg green color video removal
body: <p>I am using ffmpeg on Mac to remove green background of video and add other background as image it is converting properly the video but auido is missing. I am using below command.</p>
  
  <p>Am I doing anything wrong here?</p>
  
  <pre><code>ffmpeg -i bg.jpg -i input.mp4 -filter_complex "[1:v]colorkey=0x3BBD1E:0.3:0.2[ckout];[0:v][ckout]overlay[out]" -map "[out]" output.mp4
  </code></pre>