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Topic: Overread (Read 3161 times) previous topic - next topic
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Overread

hi, ive setup eac with flac encoder, and am sure about all the settings apart from the 'overread into leadin/out' check box.
my drive (liteon dvdrw) has a read offset of +12 a set by accurip. 
however, when looking at the relevant databases, although my exact drive name is not on the list, most (if not all) liteon drives CANNOT overread.

1. if i use the detection method in eac is this 100% correct all of the time? ie. fine
    to use if i dont get sync errors?
2. anyone know about liteon overread compatability?
3. if a drive reads the lead in/out will the resulting flac file be longer than if wasnt 
    set to 'over'read.

Thanks

Matt

Overread

Reply #1 –
p.s.

is it better not to use +12 offset if drive cannot overread? i.e. set the offset back to 0??

Overread

Reply #2 –
Accurip has detected a read offset correction of +12 samples and your actual read offset is -12. Your drive starts reading 12 samples too early.
Quote
1. if i use the detection method in eac is this 100% correct all of the time? ie. fine
    to use if i dont get sync errors?

Some say it isn't. To be sure rip some old AAD CDs which are likely to have noise until the very end and see if the resulting files have indeed noise until the very end. Have overread and fill up missing offset samples enabled during this test. If the drive can't overread, some files will have 12 null samples at the end instead of noise. The other ones will have a lot more null samples, since they don't have noise until the end. If it can, there won't be some files with 12 null samples.
Quote
is it better not to use +12 offset if drive cannot overread? i.e. set the offset back to 0?

Since accurip needs offset correction I don't recommend this. Also, once accurip is configured, read offset options are greyed out (with good reason) and you can't set it back to 0 unless you hack the registry or rename accuraterip.dll, but that just disables accurip. In case the drive can't overread, use "fill up mising offset samples with silence".
I know that I know nothing. But how can I then know that ?

Overread

Reply #3 –
thanks for the reply! i think ill disable the overread function and jus stick with adding the silence!

Cheers

Matt

Overread

Reply #4 –
You get no benefit in disabling accuraterip or not having the read offset. I would suggest you just leave it as is or invest in a drive that can overread in lead in/out.

AccurateRip is even more reliable then the EAC results so I strongly suggest using it.

Overread

Reply #5 –
Quote
3. if a drive reads the lead in/out will the resulting flac file be longer than if wasnt 
    set to 'over'read.

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Only by a few samples which are usually silence
 

Overread

Reply #6 –
And not if you have the "Fill up missing offset samples with silence" option enabled - which you probably should for the sake of correct file-length.

I think you'd be especially advised to check this option if you're using negative offset correction, otherwise I think you would have missing, not just null, samples at the start -  this would make index points inaccurate (however negligibly).


Edit: Clarification; this is as far as I am aware