mpeg-1 file size not necessarily smaller than mpeg-2?

Discussion in 'Amateur Video Production' started by Doc, Nov 12, 2006.

  1. Doc

    Doc Guest

    By accident, I stumbled onto an observation about mpeg-1 & 2 file size
    comparisons. Made 2 mpegs in TMPGEnc of the same DV source file, approx
    1 minute long. Both 8000kbps, both 720 x 480. They both come out to
    about 58 megs. However, the mpeg-1 file looks much worse.

    Also, I had it in my head that mpeg-1 was limited to 320x240 but
    apparently not.

    So, what *is* the difference between the 2 types and why would you use
    mpeg-1 instead of mpeg-2?
     
    Doc, Nov 12, 2006
    #1
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  2. Doc

    Mike Kujbida Guest


    mpeg-1 will play on (almost) any computer while mpeg-2 may need a specific
    codec. Fortunately this can be solved by using Media Player Classic or VLC
    media player, both of which are free.

    Mike
     
    Mike Kujbida, Nov 12, 2006
    #2
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  3. Doc

    Ken Maltby Guest

    MPEG-2 was developed, mainly, to handle interlaced video.
    To do so properly (in MPEG) you need the image to be x480.

    The MPEG-1 format is quite efficient and is very useful for
    non-interlaced video. This is especially true for smaller image
    sizes. For these and other reasons it is well suited for display
    on web pages, and use with some surveillance systems.

    Luck;
    Ken
     
    Ken Maltby, Nov 12, 2006
    #3
  4. Do the arithmetic. 8000Kbps times n seconds gives the same result
    regardless of which method you use to generate the bits.
     
    Gene E. Bloch, Nov 13, 2006
    #4
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