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divx questions

Discussion in 'Televisions' started by dapex, Aug 24, 2005.

  1. dapex

    dapex
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    a few of us have been talking today and HD came into the conversation. One guy was telling me about HD stuff being available in Divx, now this seems odd to me, How can stuff be compressed in any way and still keep the true HD quality.

    Anyone care to explain??

    Cheers
     
  2. jaymz

    jaymz
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    HD is the image resolution e.g 720p is 1280 x 720 pixels.

    Divx codec uses a mathmatical algorithm to take the picture image and compress it. The quality of the image is based on the sample rate and therefore can vary. Divx is just a codec the same as MPEG1, MPEG2 (TV programmes IIRC), MPEG4 etc.

    It is based on the assumption that there is a limit that the human eye (this is the same as a digital photo in JPEG format) or the ear, in the case of MP3 etc, can not detect the difference.

    Divx6 codec has recently been released which has a new algorithm to support HD movies.

    Divx HD is 720p thereofre Hi Def, however the image itself will not be the same quality as it is compressed!!

    For example an area of the frame may have 20 shades of grey but the Dixv HD image will have mathematically converted the 20 shades into 6 so the image still has the same pixel count but the quality has reduced.

    Have a look at www.divx.com/hd/faq.php, they also have some HD-divx trailers!
     

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