Re: Making exact audio CD copies
From: Dances With Crows (danSPANceswitTRAPhcrows_at_usa.net)
Date: 10/29/03
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Date: 29 Oct 2003 19:26:14 GMT
On Wed, 29 Oct 2003 15:14:27 GMT, Hactar staggered into the Black Sun
and said:
> In article
> <slrnbpu4t4.vbo.danSPANceswitTRAPhcrows@samantha.crow202.dyndns.org>,
> Dances With Crows <daSPANnceswithcroTRAPws@usa.net> wrote:
>> On Tue, 28 Oct 2003 16:46:50 -0700, Bob van der Poel staggered into the
>> Black Sun and said:
>> > I notice that if my friends make a CD for me (a copy of an original)
>> > the track lengths are the same as the original. This means that CDDB
>> > programs like grip can find the proper info for those CDs. However,
>> > when I make a CD, the tracks are all a tiny bit longer. I use the
>> > cdparanoia -B 1-
>> > cdrecord -v -dev 0,3,0 -audio *.wav
>>
>> You need "cdrdao copy --device X,Y,Z" if you want to make an exact
>> copy of any CD. Using cdparanoia and cdrecord will cause the slight
>> variations that you noticed, because cdrecord will pad audio sectors
>> so that they're exact multiples of 2352 bytes. HTH,
>
> [eben@pc eben]$ echo '44100 4* 75/p' | dc
> 2352
>
> So one 1/75-second sector is 2352 bytes. If (on the source CD) the
> song was X sectors + one sample long, it would X+1 sectors long (with
> the X+1th sector being mostly empty), right? How is that different
> from your description of cdrecord's operation?
Hm. I *thought* that you could set things up such that offsets in the
TOC were such that you could jump to the middle of a sector. That's
probably not right, and you're probably right in that each track must be
an integral number of sectors. BUT: cdrecord when invoked without
options will follow the Red Book standards when creating audio CDs.
This means there will be a 2-second gap between each set of audio
tracks, and audio tracks must be at least 4 seconds long. You have to
write in DAO mode to overcome these restrictions, and those restrictions
may be what Bob's running into when he tries to make exact copies
without cdrdao.
-- Matt G|There is no Darkness in Eternity/But only Light too dim for us to see Brainbench MVP for Linux Admin / mail: TRAP + SPAN don't belong http://www.brainbench.com / "He is a rhythmic movement of the -----------------------------/ penguins, is Tux." --MegaHAL
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