Debian Bug report logs - #646384
O: vbrfix -- corrects MP3 files that have incorrect VBR information

Package: wnpp; Maintainer for wnpp is wnpp@debian.org;

Reported by: Rogério Brito <rbrito@ime.usp.br>

Date: Sun, 23 Oct 2011 18:03:05 UTC

Severity: normal

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Report forwarded to debian-bugs-dist@lists.debian.org, wnpp@debian.org:
Bug#646384; Package wnpp. (Sun, 23 Oct 2011 18:03:08 GMT) Full text and rfc822 format available.

Acknowledgement sent to Rogério Brito <rbrito@ime.usp.br>:
New Bug report received and forwarded. Copy sent to wnpp@debian.org. (Sun, 23 Oct 2011 18:03:08 GMT) Full text and rfc822 format available.

Message #5 received at submit@bugs.debian.org (full text, mbox):

From: Rogério Brito <rbrito@ime.usp.br>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: O: vbrfix -- corrects MP3 files that have incorrect VBR information
Date: Sun, 23 Oct 2011 16:00:37 -0200
Package: wnpp
Severity: normal

I intend to orphan the vbrfix package. The reasons why I am orphaning vbrfix
is that:

* Its implementation is not exactly clean.

* I've been using a tool called mp3packer that does the same job that vbrfix
  does and more (including rearranging the frames of the MP3 file so that the
  file occupies less space than the original one, all losslessly).


The package description is:
 In an average song there are points that require high quality and points
 that require low quality (i.e. silence).
 .
 Instead of having the whole file at, say, 160kbps CBR (Constant Bit Rate),
 we can use VBR (Variable Bit Rate). This allows us to have use low bitrates
 at points that does not require high quality (were a higher bitrate would
 not affect the sound heard) and high bitrates when needed. The result is
 usually a smaller MP3 file, with higher quality.
 .
 Unfortunately, the many MP3 decoders estimate the time of a MP3 file based
 on the first bitrate they find and the filesize. This means that the
 "prediction" used by such decoders is wildly wrong with VBR encoded files
 and, as a result, you can get fairly random times for such songs.
 .
 As most songs start with silence you usually get the song length being
 shown as much longer than it should be. Also when you jump through a
 file encoded in VBR, 50% through the file is usually not 50% through the
 song.
 .
 A VBR null frame is placed at the beginning of the file to tell the MP3
 player information about the song length and indexing through the song.
 .
 The problem arises because some poor encoders don't produce this null
 frame or do so incorrectly and this is what vbrfix attempts to fix.
 .
 Vbrfix can also fix other problems with MP3s as it deletes all non-MP3
 content (you can keep tags that you state, though).  It can also help
 when merging two VBR MP3s together with a merging tool and then needing
 a newly calculated VBR null frame.

-- 
Rogério Brito : rbrito@{ime.usp.br,gmail.com} : GPG key 4096R/BCFCAAAA
http://rb.doesntexist.org : Packages for LaTeX : algorithms.berlios.de
DebianQA: http://qa.debian.org/developer.php?login=rbrito%40ime.usp.br




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