On 2010-07-04 14:16 GMT eagles500 wrote:
> Carlos E. R.;2184690 Wrote:
> > Conversion is lossy, even if you use he same bitrates and all
> > equivalent
> > settings.
> i know it’s lossy i just dont want it trying to convert a 192k mp3 to
> a 350k ogg or taking a 320k mp3 and trying to make a 192k ogg with it
> im just trying to get it all converted over with somewhat comparable
> quality between the original files and the new ogg’s
I don’t think you can ever get comparable quality.
However, as modern music is just noise, it does not matter >:-P
The conversion is done this way:
- rip the audio
- convert to mp3, loosing some quality.
- expand mp3 to something.
- compress to ogg, loosing (again) some more quality.
The compression works by reducing accuracy of certain parts of sound
that are deemed beyond the auditory resolution ability of most people.
This method is commonly referred to as perceptual coding. It uses
psychoacoustic models to discard or reduce precision of components less
audible to human hearing, and then records the remaining information in
an efficient manner.
The Ogg container format can multiplex a number of independent streams
for audio, video, text (such as subtitles), and metadata.
In the Ogg multimedia framework, Theora provides a lossy video layer.
The audio layer is most commonly provided by the music-oriented Vorbis
format but other options include the human speech compression codec
Speex, the lossless audio compression codec FLAC, and OggPCM.
Vorbis is a continuation of audio compression development started in
1993 by Chris Montgomery. Intensive development began following
a September 1998 letter from Fraunhofer Society announcing plans to
charge licensing fees for the MP3 audio format. Vorbis project
started as part of the Xiphophorus company’s Ogg project (also known as
OggSquish multimedia project). Chris Montgomery began work on
the project and was assisted by a growing number of other developers.
They continued refining the source code until the Vorbis file format
was frozen for 1.0 in May 2000 and a stable version (1.0) of
the reference software was released on July 19, 2002.
Cheers / Saludos,
Carlos E. R.
(from 11.2 x86_64 “Emerald” GM (Elessar))