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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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mjb2006
post Sep 10 2012, 16:59
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The track 01 pre-gap is usually all zeroes (digital silence), but IIRC I've seen it instead sometimes be very quiet noise, so I wouldn't assume anything.

AccurateRip checksums don't include the track 01 pregap, nor the first ~5 frames of track 01, nor the last 5 frames of the last track...
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