[vorbis-dev] thoughts about MP3 -> OGG convertor

[John Zitterkopf]

I understood this; however, it doesn't prevent people from desireing this
option - as such I will provide it.

As long as Napster-like free file shareing exist; 
and Hardware-based devices only support MP3;
The desire to convert from OGG to MP3 will always be there.

Since my purpose is to provide features people will pay for; I will do it.

I always knew there would be issues with MP3 <-> OGG due to the different
compression schemes. Are these "artifacts" very noticable in the playback?

Thanks to each of you for your comments; I will seriously consider the
"Source = unknown MP3" vorbis tag if everyone agrees. I'll also likely
place some kind of warning to end users about the artifact issue when
converting between these formats.

John

              EE's do it 'til it Hz 8-)
~~~~~~~~~~~~~~~~~~John D. Zitterkopf~~~~~~~~~~~~~~
zitt at bigfoot.com           http://www.zittware.com
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On Tue, 18 Dec 2001, Linus Walleij wrote:

> On Tue, 18 Dec 2001, John Zitterkopf wrote:
> 
> > Why is this a bad IDEA? I take it it's because of the "lossy" nature of
> > both types.
> 
> Its a bad idea because mp3-compression and vorbis compression affect the
> audio in different ways: artifacts from the mp3compression will be mixed
> with artifacts from the vorbis compression.
> 
> Or to put it simple: mp3 throws away information from your signal. You
> then reconstruct it, and you have a signal with the same timespan but less
> information about the original sound. Then vorbis throws away more
> information during its compression stage, but at different "places".
> 
> Its like taping something from a tape that is already taped from something
> else. Or taking a photocopy of a photocopy.
> 
> Cliffhanger: I PRESUME it could be possible to convert the kind of
> mathematical information stored in MP3 files to the kind of
> mathematical information stored inside vorbis files, without
> decompressing the audio and recompressing it inbetween, thus creating a
> minimal loss transfer method. If you love maths, transforms and the
> like, by all means have a look at it.
> 
> Linus
> 
> 
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