title: Compress Video While Preserving Alpha Channel
body: <p>I have a video with a transparent background that is very large despite being only 6 seconds. I was hoping I could compress it with FFmpeg but everything I try seems to discard the alpha channel...</p>
  
  <p>This code brings the file down from 33gb to 24mb:</p>
  
  <pre><code>ffmpeg -i "C:\Users\djcim\Desktop\Intro For Now\Video Intro.avi" -map 0 -c:v libx264 -preset slow ^
  -crf 17 -acodec copy "C:\Users\djcim\Desktop\Intro For Now\Compressed.avi"
  </code></pre>
  
  <p>But as stated I lose the alpha channel, any ideas on how I could significantly compress my file while preserving the alpha channel? </p>