Date: Sat, 29 Nov 2008 12:13:30 -0800 From: Yuri <yuri@rawbw.com> To: Joerg Schilling <Joerg.Schilling@fokus.fraunhofer.de> Cc: freebsd-questions@freebsd.org Subject: Re: Copying audio CD with dd/cdrecord produces unplayable CD Message-ID: <4931A26A.3070002@rawbw.com> In-Reply-To: <49319841.Oqivnl2VRh3sEhq6%Joerg.Schilling@fokus.fraunhofer.de> References: <49313043.mP3zqfP/2LOQEKJe%Joerg.Schilling@fokus.fraunhofer.de> <49318B65.3000205@rawbw.com> <49319841.Oqivnl2VRh3sEhq6%Joerg.Schilling@fokus.fraunhofer.de>
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Joerg Schilling wrote: > 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. > Thank you, good points. This seems to be reflected in the Handbook. I will file a PR for this. Yuri
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