Re: Music CD's

From: Jens Axboe (axboe@suse.de)
Date: Sun Apr 02 2000 - 16:15:28 EST


On Sun, Apr 02 2000, David Elliott wrote:
> > You can.
> > But you have to apply a little patch ;)
> > Look at http://fly.cc.fer.hr/~ptolomei/audiofs/
> > If it only could make mp3s on the fly ...
> >
>
> Sorry, but I have to say that that has to be the dumbest idea I have ever
> seen.
>
> Reading audio off of an audio CD is not a perfect process. If you read the
> Audio CD specification you'll notice that the best resolution you can get is
> 1/63 of a second (since every frame is 1/75 of a second). So to fix that
> problem you need things like jitter correction algorithms (unless your CD-ROM
> already does it) and algorithms to correctly get around scratches.
>
> Trying to put all that crap in the kernel is pretty dumb. And if you just do
> a half-assed job and only let it work for perfect non-scratched CDs on
> CD-ROMs with built-in jitter correction, then we will have even more
> half-assed MP3s with pops and skips in them.
>
> By far, the best thing to do is keep this crap OUT of the kernel. The
> cdparanoia program can do just about anything you want, and NEVER pops or
> skips even on shitty drives. If you are making MP3s of CDs I strongly
> suggest that you use cdparanoia and a good encoder.

Hear hear. This "audio file system" topic has been brought up so many
times before, your comment is right on the spot. Should be added to an
FAQ.

-- 
*  Jens Axboe <axboe@suse.de>
*  Linux CD/DVD-ROM, SuSE Labs
*  http://kernel.dk

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