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Are all 32 pre-gap frames equal?, Doing experiments to verify old rips...
krafty
post Sep 10 2012, 16:39
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In the past I have ripped some old CDs which have a pre-gap of 32 frames before the first track. Ripped as tracks, and the pre-gap was left out (And can't verify the rip anymore against AR).

I found out that making a sum of this gap, extracted from any CD that has this gap, plus the "rest" of the rip in the form of image, will give me the exact full image ripped, that had those samples discarded from the initial rip.

But I also found that this can work with any other CD that has the same 32 frames pre-gap, using the same gap file. And the same goes for other gaps such as 33 frames. To the point that I can recreate old rips in its "full entirety" to be checked against AccurateRip without having to rerip all over again.

The question is rather subjective, but are these pre-gaps all binary identical by convention or will they differ as in data sound depending on the "rare" CD with that....?

This post has been edited by krafty: Sep 10 2012, 16:41
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krafty
post Sep 10 2012, 17:09
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Say that you use foobar2000 to do: rip to multitrack. It will preserve the pre-gap.
If you rip track-based, it will discard the pre-gap.

The multitrack rip will be straight "accuraterippable"...
The second one might not be, it will depend on the database and calculations (as if you check your rip straight off the files only).
CDs without a pre-gap are "accuraterippable" just like the multitrack rips.

What I am saying is that if you get this pre-gap in a file, and join with the track-based rip, you will get the result as if you have ripped multitrack.
The interesting thing is that most 32 gaps are just the same so you can re-create full multi-track rips with that one missing gap.

I just found a 32 gap which was not the same as other identical I used to recreate 5 rips.
So the mileage may vary.

This post has been edited by krafty: Sep 10 2012, 17:11
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