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Topic: Eac offsets (Read 5636 times) previous topic - next topic
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Eac offsets

I am looking for the Eac offset of my new Aopen 5224 CDRW.

Are there any web sites that list Eac info for drives?

Or does anyone know what the offset should be?

Also I would like to use gap detection and those settings would be useful.

Spenno

Eac offsets

Reply #1 –
You can find it out in EAC, using one of the test CDs listed in EAC.TXT.

Eac offsets

Reply #2 –
http://www.ping.be/satcp/eacoffsets01.htm

Seems like your drive isn't in that database. 
Let's suppose that rain washes out a picnic. Who is feeling negative? The rain? Or YOU? What's causing the negative feeling? The rain or your reaction? - Anthony De Mello

Eac offsets

Reply #3 –
What can be the consequences of not configuring "offset" settings?
Wanna buy a monkey?

Eac offsets

Reply #4 –
I actually bought a cd that was listed on the EAC offset database, but I still couldn't determine my offsets because the cd was a different code than the one used in EAC.  Is there any other way to determine my offsets?  My cdrw is a Sony 32/10/40 CRX185.

Eac offsets

Reply #5 –
Consequences? Hardly any. Just that the content will be shifted either a little to the left, or a little to the right, because of the cd rippers' inability to accurately pinpoint the wanted sector.. this is because audio cds don't contain location information for sectors the way data cds do, and because all rippers available for personal use will read the sector a little bit off, you get a negative or positive offset. This does not disgrade sound quality any.. just that the content is shifted some samples in either direction.. ie.. if your drive has a sector offset of -200 samples.. the first 200 or something around there samples will be pregap instead of actual content, because your drive started reading 200 samples too early.. this means that everything will be shifted to the right, meaning that track 2's first 200 samples will be the last 200 samples of track 1, track 3's first 200 samples will be the last 200 samples of track 2 and etc.. the last 200 samples of the last track will be, likr, totally lost. (that's how I recall it works anyway, sorry for any inaccuracies here).

So how much is a shift in samples worth in seconds? well..  that should be as simple as dividing the offset value with 44100.. So an offset of -200 would mean that it is shifted 0.0045351473922902494331065759637188 seconds to the right.. =) You hardly lose anything, in other words.. even if you miss 0.0045 seconds in a middle of song, you most often wouldn't even  notice that!! And here, you're never loosing anything in the middle, so you probably might never ever notice a difference.

And if that doesn't comfort you enough..  some samples will be missing EVEN if you have correct offset values and everything.... because as far as i know 100% accurate copies are not possible with consumer readers.

If I had said many things wrong here, pl ease correct me as I'm not certain of everything I said. And excuse me for english.

Eac offsets

Reply #6 –
Quite enlightening aabxx, thanx.
My drive also isn't in the database... (Plexwriter 48/24/48A)
Wanna buy a monkey?

Eac offsets

Reply #7 –
Quote
Quite enlightening aabxx, thanx.
My drive also isn't in the database... (Plexwriter 48/24/48A)

You're from Europe - so you got Plextools with your drive, right?
Plextools "know" and report correct offset values for plextor drives as mentioned in this thread.
Let's suppose that rain washes out a picnic. Who is feeling negative? The rain? Or YOU? What's causing the negative feeling? The rain or your reaction? - Anthony De Mello

Eac offsets

Reply #8 –
Quote
some samples will be missing EVEN if you have correct offset values and everything.... because as far as i know 100% accurate copies are not possible with consumer readers.

It's quite possible to read all the samples. Many drives allow overread.
Burning them back at the same place is another matter ! EAC supports overwrite only with Teac writers, and not all of them might support overwriting.
Maybe Plextools allows to overread and overwrite. It's quite probable (anyone with two burners wants to test ?).

But anyway, CDs with noise in the "overread" zone usually have noise far deeper into the lead-out... Won't you like to copy it too  ?

Follow the FAQ links about offsets for more discussions.

Eac offsets

Reply #9 –
Reiginsei - I have the same Sony CD-RW. Have been ripping for sometime with EAC with no problems. I don't know if this will help you at all, but the settings EAC produced when it read the drive were:

Use combined read/write sample offset correction - value = 0

Speed selection = Actual

Check in box for Allow Speed Reduction during Extraction
 

Eac offsets

Reply #10 –
Quote
Reiginsei - I have the same Sony CD-RW. Have been ripping for sometime with EAC with no problems. I don't know if this will help you at all, but the settings EAC produced when it read the drive were:

Use combined read/write sample offset correction - value = 0

Speed selection = Actual

Check in box for Allow Speed Reduction during Extraction

Yes, those are the settings I have.  But when I put the cd I bought that was listed in the EAC database, and click detect read sample offset, it says cd not found in database.  On the ping.be website, there is a Sony 16x cdrw that seems to be like the one we have, I wonder if the offsets listed is the same as the 32x.

Eac offsets

Reply #11 –
Quote
My drive also isn't in the database... (Plexwriter 48/24/48A)

If you have Plextools it will tell you what the read and write offset values are for the 48/24/48. I'm using 1.18
and also have that drive.

Eac offsets

Reply #12 –
Quote
I actually bought a cd that was listed on the EAC offset database, but I still couldn't determine my offsets because the cd was a different code than the one used in EAC.  Is there any other way to determine my offsets?  My cdrw is a Sony 32/10/40 CRX185.

Yes, burn an offset test CD onto CD-RW, and check it for accuracy using a drive with known offset.
Then, you can determine the offset of any CDROM drive automatically, by yourself, and possibly submit them to the database 

Eac offsets

Reply #13 –
I use a Plextor 24/10/40A.
Plextools reports read offset as -392.
EAC database reports as +98, I also get the same reading using a CD to check it locally.
Which is correct?

Edit
Ok, This thread sort of explains the difference.
The EAC database is old, "Updated at 02/26/2002".
Not likely newer drives will ever be listed there.

Eac offsets

Reply #14 –
Quote
I am looking for the Eac offset of my new Aopen 5224 CDRW.

hmmm...

Note: offsets are not essential, but i understand you want to do things perfect and I want to  help you.

I have a CRW3248, which is a rebadged ricoh (MD997... or something)
Chances are that your drive is such a Ricoh as well. All their latest models have the same offset features:

read offset: -97 --> read offset correction: +97  (this is the number EAC wants)
write offset: +6  (this is the number EAC wants)

What I suggest is: try to fetch one offset reference CD and verify this number (97).
If that is not possible, look for someone with an offset corrected drive who has a CD you have as well (same CD pressing number), ask him to rip a track and "compare WAVs..." ( = EAC command ). It will tell you what the shift is between your two drives (#samples). This is another method to find your offset.
A third method is... wait! you say you just bought a new drive? What was your old drive, do you know its  offset? If so, rip a track in both drives and again "compare WAVs..." in EAC.

Success! 


liekloo

Eac offsets

Reply #15 –
Quote
(...) and possibly submit them to the database  ;)

Quote
The EAC database is old, "Updated at 02/26/2002".
Not likely newer drives will ever be listed there.


Yes, I dont think it is still being updated.

New offsets are still found, (I sometimes help ppl finding them)  but they aren't added to any database, which is a pity.
hmm... When I'll have more time...   
(well in that case I'll let you know something)

Eac offsets

Reply #17 –
Spoon,

there is even more (correct me if i am wrong):

most "accuraterips" are done without (or with wrong as you say) offset corrections, so your job will be very hard.
The idea is great, but in reality it will be hard to cope with offset issues...

Eac offsets

Reply #18 –
Quote
most "accuraterips" are done without (or with wrong as you say) offset corrections, so your job will be very hard.The idea is great, but in reality it will be hard to cope with offset issues...  


It copes by not working with accuraterip until it has 'keyed' on a known disc and got the exact offsets for that drive. Then it is configured and partakes in the accuraterip universe.