title: H.264 - Relationship between video bitrate and quality
body: <p>I have been given the task to convert an uncompressed movie to H.264 format. The original movie takes up 80G. I am hoping to bring it down to 10G without losing much in quality.</p>
  
  <p>It appears most 2-hour long BD movies that are in H.264/AVC format run at 24 MBPS bitrate (video) and take up about 20G to 30G disk space.</p>
  
  <p>I am wondering if the relationship between the bitrate and the video quality is linearly proportional. In other words, if I reduce the bitrate to half, will the video quality go down by 50%?</p>
  
  <p>Is there a formula to calculate appropriate bitrate for an action movie while keeping the quality to about 80% of the original?</p>