title: ffmpeg mp4 to webm through icecast server livestream
body: <p>I'm trying to stream huge MP4 videos (2.5Go) on an icecast server. After playing a lot with ffmpeg options to get the best quality/speed encoding settings, I'm facing a strange issue.</p>
  
  <p>If I launch my ffmpeg streaming and load the video in the browser I can see it, but if I try to join it after 30s, I just get a black screen with the bottom video player bar.</p>
  
  <p>Is there somewhere we can see errors ? And where ? I don't really get if the error is coming from ffmpeg / icecast / my web browser ...</p>
  
  <p>If somebody can give me a clue.</p>
  
  <p>Here is my setup on ffmpeg :</p>
  
  <pre><code>./ffmpeg -i stream/my_video.mp4 \
          -acodec libopus -b:a 64k \
          -vcodec libvpx -b:v 500K -crf 25 -vf scale=640:360 -content_type video/webm \
          -loop 365 \
          icecast://source:Password@server:8000/live.webm
  </code></pre>