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Thread: Mpeg 2 Bitrate

  1. #1

    Default Mpeg 2 Bitrate


    There is a lot of talk from Sony about using Mpeg 2 compression on their Blu-ray discs at a bitrate of 18mbps.

    I checked a few of my DVD's and they were all around 5mbps bitrate using Mpeg 2. 18mbps is 3.5 times the bitrate of DVD's but is pushing 6 times the resolution therefore to have the same compression as DVD's wouldn't the movie need to be encoded at 30mbps. I don't see how Mpeg 2 could look its best at 18mbps.

    What is the bitrate usually of HD-DVD'S VC1 encoding and also Mpeg 4 Blu-ray movies?
  2. #2
    Join Date
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    The IPB keyframes which MPEG uses means that the quality to bit-rate ratio isn't 1:1. You could double or triple the bitrate on the same source and it would still fall victim to artifacts. It's more about HOW it's encoded, not at what rate. I would think that studios would use a multi-pass variable bit-rate encoding to get the quality at a certain level for VC-1/MPEG-4.
  3. #3
    I discovered this excellent thread for those that are interested in Blu-ray movies size and bitrates. Looks like those 50gb discs are very useful.

    http://forum.blu-ray.com/showthread.php?t=3338
  4. #4
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    Quote Originally Posted by zzap64 View Post
    I discovered this excellent thread for those that are interested in Blu-ray movies size and bitrates. Looks like those 50gb discs are very useful.

    http://forum.blu-ray.com/showthread.php?t=3338
    Very interesting, thanks for posting the link!

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