Date: Sat, 29 Nov 2008 20:30:09 +0100 From: Joerg.Schilling@fokus.fraunhofer.de (Joerg Schilling) To: yuri@rawbw.com Cc: freebsd-questions@freebsd.org Subject: Re: Copying audio CD with dd/cdrecord produces unplayable CD Message-ID: <49319841.Oqivnl2VRh3sEhq6%Joerg.Schilling@fokus.fraunhofer.de> In-Reply-To: <49318B65.3000205@rawbw.com> References: <49313043.mP3zqfP/2LOQEKJe%Joerg.Schilling@fokus.fraunhofer.de> <49318B65.3000205@rawbw.com>
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Yuri <yuri@rawbw.com> wrote:
> Joerg Schilling wrote:
> > Well, you should not expect to get a usable read
> > result from dd.
> >
>
> Why?
> Handbook recommends the use of dd for audio CD ripping.
Well, then the handbook is sub-optimal.
dd in general does not work at all to read CD-Audio;
FreeBSD is an exception with repect to the fact that you get data at all.
Here is a list of cons for dd even on FreeBSD:
- dd may not work with all drives
- Do you know what byteorder you get from a MMC CD-ROM drive
on FreeBSD/Sparc? You would need network byteorder on Sparc
but the MMC CD-ROM drive delivers intel byteorder due to a
bug in the MMC standard
cdrecord always asumes network byte order for RAW audio data,
this is reasonable
- Why would you deal with raw audio data at all if there are
audio file formats that include a notation for byte order and
sampling rates?
- There is no jitter check and no quality control with dd on FreeBSD,
cdda2wav works on all OS and has jitter control and qualiti control
with e.g. libparanoia.
- There is no way to get the correct CD structure back if you use dd.
Cdda2wav reads meta-data and puts them into *.inf files.
- With dd, you cannot read intentionally defective media as sold by
the music mafia.
Allowing to read CD-DA using dd on FreeBSD is a nice gag but nothing I would
recommend in order to create a copy from an audio CD.
Jörg
--
EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
js@cs.tu-berlin.de (uni)
schilling@fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/private/ ftp://ftp.berlios.de/pub/schily
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