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Thread: packMP3 v1.0d release: Open source under the GPL v3

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    packMP3 v1.0d release: Open source under the GPL v3

    I've finally released the packMP3 source code for everyone to optimize and toy around with it. It is attached here and you can also download it from:
    www.matthiasstirner.com.

    packMP3 is a compression program specially designed for further compression of MPEG-1 Audio Layer III audio files without causing any further loss. Typically it reduces the file size of a MP3 file by 16% based on tests with 6000 randomly selected files.
    Attached Files Attached Files

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    Initial impressions after ~10 minutes of playing around:

    It achieves pretty good compression of around 86% to 88% on my files. Embedded album art does not seem to be compressed in the way that packJPG compresses it(jpegrescanned mp3 procuded a smaller file). It also seems that using mp3packer prior to compression is not quite a good idea. I'll do more tests on this later.

    I just created a CBR mp3 using LAME from a lossless source and repacked it afterwards using mp3packer. The mp3packer file ended up being slightly bigger than the original CBR. However I also took a ~264kbps VBR file and repacked it to 320kbps CBR where compression was hurt. This seems to be a pattern with pack* compressors where preprocessing hurts compression.

    Overall, nicely done

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    Very nice work! I tried it out on a ~1gb directory of mp3's of c64 game music remixes (from http://remix.kwed.org/) and got a overall compression ratio of 82.96%.

    I had to add -fpermissive to get it to compile using GCC 4.8.1 (Linux 64-bit) due to a invalid conversion from const char* to char* .

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    I have several problem samples which were retagged from the original source. Here's one.

    https://mega.co.nz/#!TJBlSTjC!COv3OR...Q_NUSOrHaMUgkE

    The error I get is (no mpeg audio data recognized)

    I redownloaded the album and have no issues with the stock. Will be investigating further...

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