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Subject: Re: unique, automatically loaded EQ for each song
From: mrlipring (mrlipring_at_tiscali.co.uk)
Date: 2003-09-30


Yeah, i understand, but this still involved editing the file, if not
reencoding the audio. This means that to listen to the song in its original
volume, and to listen to it normalised without transferring it again would
require two copies of the file to be present on the archos.

----- Original Message -----
From: "Chris Holt" <amiga2k_at_cox.net>
To: <rockbox_at_cool.haxx.se>
Sent: Tuesday, September 30, 2003 5:32 PM
Subject: Re: unique, automatically loaded EQ for each song

> On Tue, 30 Sep 2003 17:10:19 +0100, mrlipring wrote:
> > doesn't that involve reencoding though?
> >
> >
> > either way, it involves changing the file itself. you can't listen to a
> > song in a global playlist, normalised, then decide you want to listen
> > to that album, with each song in its original volume context (can't
> > think of the proper way to say that, but you get me).
> >
> > We need to be able to store something in an extended id3v2 tag that
> > holds the normalisation info. Even if it involved running an external
> > app over the files once, then rockbox reads this extra tag, that'd be
> > excellent.
>
> No, this is not true. MP3Gain changes the global gain variable in each
> frame of the MP3. It does not alter the audio information in any way and
> the process is reversible. (easily so as the original values can be saved
> from the software). Alternatively, one could only alter the files on the
> device and leave the ones on the computer at their original levels.
>
> Note also that MP3Gain does both file by file and album normalization. In
> album mode, each tracks gain is adjusted relative to the others,
> especially useful for generes like classical where some passages are
> supposed to sound quieter than others.
>
> Even in file by file mode, the default for MP3Gain is to adjust levels
> based on percieved loudness rather than just the highest peak, so a
> particularly loud note will not cripple it's ability to adjust gain for
> the rest of the track. Also in every case the user is warned if the
> requested level will cause clipping in the music. (file info turns red)
>
> Chris
>



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