[vorbis] Ogg artifacts

[Carsten Haese]

On Thu, 2004-01-22 at 16:57, Jon Pomrenke wrote:
> I'm having some difficulty getting into Ogg. Being my first time encoding to
> Ogg, I am left doubtful of the quality in reproduction. Hopefully, it is
> merely something that I am doing.

Unless I'm misunderstanding your description below, you're comparing the
CD ripping mechanisms of tkcOggRipper and EAC, not the codecs MP3 and
Ogg Vorbis. To compare the codecs, you should take the uncompressed WAV
from EAC, encode that with MP3 and Ogg Vorbis respectively, and compare
the results.

Hope this helps,

Carsten.

> My original intentions were to go through my CD collection and rip
> everything out at 224kps VBR. I began with an album I was relatively
> familiar with. I used FreeRip 2.53 initially, but found that I had
> artifacts (clipping) in a couple places in a couple songs. Being suspicious
> of the binaries being used, I switched over to tkcOggRipper and re-ripped
> the album using the same settings (considerably faster rip for some
> reason). Problem still existed, though less prominant. I now focused in on
> one song.
> 
> What I got was a cleaner version of the file, but some artifacts still
> existed (2 to be specific). I listened to the cd itself and found that
> there was a hint of one of the artifacts in one position, but none that I
> could hear in the other position. The CD I was ripping off of actually
> happens to be a copy since my original CD became too scratched to use after
> an unfortunate incident. Coincidentally, I do not know how good the
> original CD was that this was taken from. Anyhow, I took that same song
> again and ripped it using LAME 3.93.1 and EAC. EAC gives a track quality
> report and on the track I kept trying to rip it reported 99.4% integrity,
> however the end result is a perfectly encoded MP3 with no artifacts.
> 
> I used a different CD as a test platform, one that was near flawless, and I
> have yet to detect any artifacts created. But being that ripping from
> imperfect CDs is a fact of life, does this hinder Oggs application? Does
> Ogg properly handle artifacts in the source, contrary to what I'm seeing? I
> can understand clipping coming across when the source has difficulty
> reading the song, but it is actually amplifying the artifact when LAME
> doesn't even produce it. Is this normal to have artifacts compounded
> through Ogg, but hidden through LAME? What does one do when they have an
> imperfect CD that plays near perfectly but does not rip to Ogg near
> perfectly?
> 
> -Jon
> Ah, lamently, no. My gastronomic capacity knows no satiety.

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