From owner-freebsd-multimedia  Thu Sep 16 10:32:30 1999
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Date: Thu, 16 Sep 1999 10:32:43 -0700
From: Steve <sreid@sea-to-sky.net>
To: freebsd-multimedia@freebsd.org
Subject: Atapi CD audio ripper quality?
Message-ID: <19990916103243.A417@grok.localnet>
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I've installed dagrab from the ports tree and am trying to figure out
whether or not I'm getting perfect rips from my audio CDs.

Presumably, because it's a digital medium, there is only one "correct"
version. Right?

First I tried dagrab'ing a track multiple times with the default
settings then comparing MD5 digests. I ripped the track seven or eight
times and they were all identical except one. So far so good, I thought.
Then I tried with "-n 16" and four out of five were identical. The thing
is, they were different from what I got using the default settings. I
tried with "-n 16 -o 6" and "-n 32", and with each setting got mostly
identical files, but different from all of the previous settings.

So how do I tell which setting (if any) is giving me the correct output?
The files all sound okay at first listen but I haven't done careful
comparisons to find out if there are audible differences. I figure it
would be too tedious to do so for every track I rip. There must be some
way to automatically figure out if the rip is good or not.

I was running with -v, and in all cases it said 0 retries for jitter
correction. If there are any errors I guess they're going undetected.

Maybe I just don't know what I'm doing? How do I find out if I'm getting
a correct rip?



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