How to get the size of a compressed file without actually compressing it?

Discussion in 'Application Software' started by imadlatch, Apr 19, 2016.

  1. imadlatch

    imadlatch MDL Junior Member

    Aug 16, 2013
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    Is there a way to do that ?:confused:
     
  2. bpwnes

    bpwnes MDL Member

    Aug 11, 2015
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    Given the way file compression works, I don't think it's possible to get an accurate value. There are probably compression programs that can give you a best guesstimation by analyzing a chunk of the file. The only compression program I ever use is 7zip, and it doesn't do it, so I can't tell you what would.
     
  3. trungpt

    trungpt MDL Addicted

    Dec 15, 2009
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    We need researchers to build a prediction model for us :(
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
  4. imadlatch

    imadlatch MDL Junior Member

    Aug 16, 2013
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    #4 imadlatch, Apr 20, 2016
    Last edited by a moderator: Apr 20, 2017
    (OP)
    No its not about prediction model but Benchmark applications that calculate compression Speed and rate somehow and result the compressed size

    I made some test with 7z but it doesn't give the compressed size

    Code:
    RAM size:    4095 MB,  # CPU hardware threads:   4
    RAM usage:    882 MB,  # Benchmark threads:      4
    
    
                           Compressing  |                  Decompressing
    Dict     Speed Usage    R/U Rating  |      Speed Usage    R/U Rating
             KiB/s     %   MIPS   MIPS  |      KiB/s     %   MIPS   MIPS
    
    
    22:       6119   274   2176   5953  |      74918   382   1673   6392
    23:       6072   289   2141   6187  |      74534   382   1688   6449
    24:       5930   293   2175   6376  |      74245   385   1694   6518
    25:       5828   302   2202   6655  |      74168   389   1697   6601
    22:       6300   289   2119   6129  |      75685   385   1676   6457
    23:       5871   294   2032   5983  |      74714   385   1680   6465
    24:       5897   299   2120   6341  |      74618   387   1694   6550
    25:       5686   302   2149   6493  |      72879   385   1683   6486
    ----------------------------------  | ------------------------------
    Avr:             293   2139   6265  |              385   1686   6490
    Tot:             339   1912   6377
    
     
  5. Symptom

    Symptom MDL Novice

    Jul 30, 2008
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    WinRAR can do at least an estimation:
    Open WinRAR - select File - Info - compression prognosis

    Example:
    h ttp://w ww.tahionic.com/computers/how%20to%20use%20winrar/WR_P4.gif