Pre-emphasis and Pre-gap info?

[Grant-4]

Can I use cdparanoia to get pre-emphasis and pre-gap info on my CDs?
I thought 'cdparanoia -Q' was giving me pre-gap info, but I've read
that it isn't accurate and I have yet to see it report "pre yes".

- Grant
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[xiphmont]

On Mon, Jul 14, 2008 at 12:32 AM, Grant <emailgrant@...> wrote:
> Can I use cdparanoia to get pre-emphasis and pre-gap info on my CDs?
> I thought 'cdparanoia -Q' was giving me pre-gap info, but I've read
> that it isn't accurate and I have yet to see it report "pre yes".

the 'pre' in the TOC listing isn't referring to pregap. It's referring
to 'preemphasis'.

 n the very early days of CDs (early 80s), this was a hack to allow
studios to directly press CD from masters that had originally been
made for vinyl records, which use a preemphasis curve.  These days,
nearly all old recordings have been remastered for CD and new masters
are made without preemphasis.  I haven't seen a CD with preemphasis in
over 20 years.

As for pre-gap, it's up to the CDROM whether reading the pregap is
supported at all.  Many cdrom drives are unable to access it.  If the
CDROM is pregap capable and the disc has a pregap, it can be ripped as
'track 0'.

Monty
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[Grant-4]

>> Can I use cdparanoia to get pre-emphasis and pre-gap info on my CDs?
>> I thought 'cdparanoia -Q' was giving me pre-gap info, but I've read
>> that it isn't accurate and I have yet to see it report "pre yes".
>
> the 'pre' in the TOC listing isn't referring to pregap. It's referring
> to 'preemphasis'.
>
>  n the very early days of CDs (early 80s), this was a hack to allow
> studios to directly press CD from masters that had originally been
> made for vinyl records, which use a preemphasis curve.  These days,
> nearly all old recordings have been remastered for CD and new masters
> are made without preemphasis.  I haven't seen a CD with preemphasis in
> over 20 years.
>
> As for pre-gap, it's up to the CDROM whether reading the pregap is
> supported at all.  Many cdrom drives are unable to access it.  If the
> CDROM is pregap capable and the disc has a pregap, it can be ripped as
> 'track 0'.
>
> Monty

Thanks Monty.  I'm mainly interested in pre-gap info so I can
determine what rubyripper is doing with pre-gaps.  EAC appends them to
the previous track by default, and that is the "format" AccurateRip
uses to generate its checksums.

Do you know of any way to determine if a track has a pre-gap (even
just a couple seconds of silence) or not without listening to each
track on a CD player?

- Grant
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[pcmcg]

On Wed, Jul 16, 2008 at 10:27 AM, Grant <emailgrant@...> wrote:

Do you know of any way to determine if a track has a pre-gap (even
just a couple seconds of silence) or not without listening to each
track on a CD player?

1) Use EAC to and run pre-gap detection on the disc.
2) cdrdao can do it with the 'read-toc' command, and make sure not to turn on the '--fast-toc' option.

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[Grant-4]

>> Do you know of any way to determine if a track has a pre-gap (even
>> just a couple seconds of silence) or not without listening to each
>> track on a CD player?
>>
>
> 1) Use EAC to and run pre-gap detection on the disc.
> 2) cdrdao can do it with the 'read-toc' command, and make sure not to turn
> on the '--fast-toc' option.

Besides EAC, would you say the best way to determine if a CD has any
tracks with pre-gaps is to:

cdrdao read-toc --device /dev/hda toc-file && rm toc-file

and watch the ouput for any "Found pre-gap:" statements?

- Grant
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