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    unpackmp2 - a preprocessor for lossless compression programs

    unpackmp2 is a filter program that performs a lossless transformation of MPEG audio Layer II data (mp2) into an unpacked format and back into mp2 format.

    It is intended to be used as a preprocessor for lossless compression programs in order to achieve a better compression of mp2 files.

    The attached archive contains Windows executables and scripts. Also included is the full source code. It should compile under Linux and other systems as well. This is free software under GNU GPL v3, http://www.gnu.org/copyleft/gpl.html

    Code:
    test results
    ------------
    test1.mp2 (125.8 MiB, 54min 57sec, 320kbps, 48kHz, stereo, source: DVB-S radio)
    
    program            options            compressed size     unpackmp2 gain
    -----------------  -----------------  ------------------  ---------------------
    unpackmp2 | lpaq8  5                  110859854 = 84.0%   12489717 (11.9 MiB)
    unpackmp2 | 7-Zip  7z LZMA ultra      117928435 = 89.4%   8262710  (7.9 MiB)
    unpackmp2 | 7-Zip  7z Bzip2 ultra     119080485 = 90.3%   7493074  (7.1 MiB)
    unpackmp2 | 7-Zip  7z PPMd ultra      120598552 = 91.4%   4933122  (4.7 MiB)
    unpackmp2 | 7-Zip  Zip Deflate ultra  120718098 = 91.5%   6127333  (5.8 MiB)
    lpaq8              5                  123349571 = 93.5%   (n/a)
    7-Zip              7z PPMd ultra      125531674 = 95.2%   (n/a)
    7-Zip              7z LZMA ultra      126191145 = 95.7%   (n/a)
    7-Zip              7z Bzip2 ultra     126573559 = 96.0%   (n/a)
    7-Zip              Zip Deflate ultra  126845431 = 96.2%   (n/a)
    (original mp2)     (n/a)              131912640 = 100.0%  (n/a)
    unpackmp2          (n/a)              202374495 = 153.4%  -70461855 (-67.2 MiB)
    Attached Files Attached Files

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