Discussion in 'Software' started by simongrahamuk, Oct 8, 2005.

  1. simongrahamuk
    Honorary Member

    simongrahamuk Hmmmmmmm?

    I was asked the other day what the difference between mpeg1 and mpeg4 format were.

    I assumed that it had something to do with the compression used. Am I on the right lines?

    This is something that I have never thought about, or even had the need to think about, I didnt even know that there were different formats to be honest!

  2. moominboy

    moominboy Gigabyte Poster

    im pretty sure you're right about the compression factor si.

    it was a while back but i read something about the difference. :rolleyes:
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  3. hbroomhall

    hbroomhall Petabyte Poster Gold Member

    In the MPEG world there are 3 main formats. 1, 2 and 4

    1 was used on 'Video CDs' (VCD) and part of the spec (layer 3 audio) was used to produce MP3. MPEG2 is used on Super Video CDs and on DVDs. This was a much improved system over 1, so allowed better quality for a given compression ratio.

    MPEG4 is intended to give reasonable results on highly compressed video, which is why it is used so much in on-line streaming stuff.

    The actual compression system is *very* complex, and uses a lot of special maths to achieve its ends.

    You can get a lot of info on MPEG from

    There are other compression systems in use, mostly as codecs in AVI and similar files.

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  4. simongrahamuk
    Honorary Member

    simongrahamuk Hmmmmmmm?

    Thanks Guys! :biggrin

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