title: How to replace a current ffmpeg command with another without stopping the broadcast
body: <p>I would like to know if I can replace a current ffmpeg command with another without stopping the broadcast.
  I explain
  I have this ffmpeg command:</p>
  <pre><code>ffmpeg   -stream_loop -1  -i myvideo1   -c:v libx264 -preset ultrafast  -c:a copy  -f flv rtmp://myoutputlive
  </code></pre>
  <p>Now if I want to make another scene with ffmpeg after some times</p>
  <pre><code>ffmpeg   -stream_loop -1  -i sound   -i  image.png   drawtext  drawbox    -c:v libx264 -preset ultrafast  -c:a copy  -f flv rtmp://myoutputlive
  </code></pre>
  <p>How to replace the first ffmpeg command by the new without down the broadcast?</p>