title: ffmpeg calculate video bitrate
body: <p>I would like to know how to calculate the bitrate of this video: <br><a href="http://jell.yfish.us/media/jellyfish-30-mbps-hd-hevc.mkv" rel="noreferrer">http://jell.yfish.us/media/jellyfish-30-mbps-hd-hevc.mkv</a></p>
  
  <p>Video details: <a href="https://i.stack.imgur.com/cpvdc.jpg" rel="noreferrer">jellyfish-30-mbps-hd-hevc Video details From MediaInfo</a>
  <br></p>
  
  <p><img src="https://i.stack.imgur.com/cpvdc.jpg"></p>
  
  <p>I used Format Factory 4.0.0 to convert *.mkv video to *.mp4 with quality [AVC High quality and size]  and its command sent to ffmpeg is: </p>
  
  <pre><code>-y -i ellyfish-30-mbps-hd-hevc.mkv -s 1920x1080 -b:v 2724k -ac 2 -r 29.970 -c:v libx264 -ar 48000 -b:a 192k -c:a aac -aspect 16:9 jellyfish-30-mbps-hd-hevc [AVC High quality and size].mp4 
  </code></pre>
  
  <p><strong>Question</strong>:<br>
  How does Format Factory calculate the video bitrate as : <code>-b:v 2724k</code>? </p>