Copying audio CD with dd/cdrecord produces unplayable CD
yuri at rawbw.com
Sat Nov 29 12:13:39 PST 2008
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.
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