Mar 15 2005, 02:33
Joined: 22-February 04
From: San Diego, CA
Member No.: 12180
What it does:
Attempts to save space by storing frame data in the smallest possible frame. Usually MP3s are already stored in the most efficient way possible. However, for high-bitrate CBR files (like --preset insane) there can be a lot of wasted space
psyllium has made a great Windows GUI for this program. The GUI thread is here. Many people will find it easier to use than the CLI, and it has a few more features too (recursive directory support, 2-pass CBR).
How to use:
Download this 7Z file (version 2.04) (mirror)
Extract to a directory that makes sense.
Type "mp3packer in.mp3 out.mp3" to repack the in.mp3 file
OR see mp3packer.html included in the package (or available here) for more options.
The source can be downloaded here (mirror).
* Can make --preset insane files up to 10% smaller LOSSLESSLY (depending on the LAME version used)
* Squeezes out all the padding it can from any MP3 (Will not produce a larger file, unless you use the -b switch or something goes wrong)
* Writes valid LAME/XING header for proper VBR seeking
* Many people also use this backwards, to losslessly turn VBR into larger CBR files to humor players which can't handle VBR
* Includes a brute-force compression optimization option as of 1.10 to further compress files
* Now supports Unicode file names and paths
* Support for encoding an entire directory of files
* Works on Windows, Linux, 64-bit Linux, Linux through WINE, and should work perfectly on any other platform with an OCaml port
* GPL, so anybody can tweak it as long as it stays GPL
A few caveats:
* The program will always output an MP3 that doesn't use CRCs, even if the input file uses CRC. This is primarily laziness on my part, but nobody really needs them, and it saves 600 bits per second... (it's a feature, not a bug!)
* The 32-bit version will not process files larger than 1GB. The 64-bit version has a much higher limitation (4EB) which is unlikely to be encountered.
* There seems to be an incompatibility with the multi-threaded repacking code and 32-bit Windows XP. If you run across an error, try adding "--workers 0" to the command line.
Changelog (click here!)
This post has been edited by Omion: Sep 1 2012, 04:34
"We demand rigidly defined areas of doubt and uncertainty!" - Vroomfondel, H2G2
Jan 16 2006, 22:03
Joined: 4-August 05
From: Birmingham, UK
Member No.: 23690
QUOTE (Omion @ Jan 16 2006, 09:34 PM)
That was a completely unintended benifit, but I suppose it works. I find it kind of funny that I made the tool to turn CBR into VBR files, and now it seems that most people are using it the other way around!
I do turn my CBR's into VBR
The reason I use repacker is because when PCut (and I'm not bashing Sebi's prog here, it's superb) cut's CBR MP3's it actually makes them VBR (the first frame is smaller than the rest CBR bitrate) but doesn't put any Xing header on. This messes up my Karma as it can't figure out the length of the file and gapless playback using the Lame tag padding.
Your MP3 packer, aswell as shedding KB's off, makes the file completely VBR compliant meaning gapless playback works like a charm.
Batch processing sounds good too...
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