Re: [gentoo-user] [OT] Decoding / encoding mp3 files

[Martins Steinbergs]

On Friday 01 September 2006 19:58, Hemmann, Volker Armin wrote:
> On Friday 01 September 2006 18:21, sdoma wrote:
> > On Fri, 2006-09-01 at 18:12 +0200, Hemmann, Volker Armin wrote:
> > > On Friday 01 September 2006 17:47, sdoma wrote:
> > > > Hi,
> > > >
> > > > I got some MP3 files which seem not to be properly coded. The
> > > > Interpret/Title information is missing for some, other show very ugly
> > > > time information in XMMS ( -234567:21, 893767:13 i.e.) but the
> > > > frame/duration in the MP3 info is correct.
> > > >
> > > > Are there any tools (preferred command line) to decode the MP3 (get a
> > > > raw audio file, wav or something similar) and in turn to code the MP3
> > > > with the proper information?
> > >
> > > even if there are tools - don't do it.
> > >
> > > The artist/title info is in the id4 tags - you can edit them with lots
> > > of tools, even inside most players. No need to recode them.
> > >
> > > And recoding: mp3 is a lossy format. If you turn them into wavs you
> > > have not only wavs based on reduced information, you remove the stuff
> > > that makes mp3 sound 'better' than they are. If you encode them again,
> > > you are removing more information.
> > >
> > > So after such a circle the sound quality would be worse. A lot worse.
> > > Hardly bearable worse.
> > >
> > > Just say no to recoding.
> >
> > Thanks for the hint.I've wodered about too if I can live with the
> > quality loss. I cann say that only if I try.
> > Well, I've tried to edit the ID4 within XMMS. I can edit this but
> > without changing the file. Saying this : I edit the tag, save it and
> > nothing changes.
> > Could you point me to some of the "lots of tools" you mentioned?
>

>
> > ... and what about the time information? It is silly to have a 3 minute
> > song with shows as days long and even negative duration :( (well, this
> > could be an ``unsigned int'' issue.
>
> I don't know how to fix it. But is it really so important? Do you watch the
> timing information while listening to the song?

to fix timing there is script Mp3Fixer for amarok

Mp3Fixer (v0.9.4)
About:
Mp3Fixer is a script for repairing MP3 files which display a bogus track 
length or bitrate in your audio player. 
For example, if you have a track that you know is really five minutes long, 
but amaroK shows the length as one hour, then this script is for you. 
Mp3Fixer calculates the real track length and adds the missing XING header to 
the file. Additionally, Mp3Fixer is capable of repairing broken MPEG header 
frames. 


see also in portage:

media-sound/mpck
Checks MP3s for errors

media-sound/vbrfixc
Vbrfix fixes MP3s and re-constructs VBR headers



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