title: FFMPEG outputs stream to UDP port, but no packets received on that port
body: <p>I am a bit new to FFMPEG and will appreciate any help I can get!
  Basically, I am trying to transcode a 'webm' UDP stream to Opus audio stream, and then finally output that to a specific UDP port on my network.</p>
  
  <p>This is the command I am using:</p>
  
  <pre><code>ffmpeg -re -i udp://127.0.0.1:2222 -vn -map 0:a -c:a libopus -f ogg udp://127.0.0.1:2224
  </code></pre>
  
  <p>However, when I check on port 2224, I do not receive any packets. </p>
  
  <p>FFMPEG is definitely receiving the input packets because if I run the following command, the file plays out perfectly:</p>
  
  <pre><code>ffmpeg -re -i udp://127.0.0.1:2222 -vn -map 0:a -c:a libopus -f test.opus
  </code></pre>
  
  <p>Does anyone have any suggestions on what mistake I am making? </p>