Hi,

I have a CDR onto which I recorded a track from a 7" vinyl record (using a CDR recorder, not my PC).

Anyway, I extracted it using a plex premium/plextools and I noticed that there were quite a few errors during extraction, resulting in the drive slowing to 8x, but it got to the end and the log claimed that all errors were recovered (The surface of the CDR is in mint condition).

So I decided to rip it again and do a wav compare using EAC. The wav compare told me the following:

error type error position
66 repeated samples 0:05:32.585
66 missing samples 0:05:32.799

So my questions are:

1) What does the output of the wav compare actually mean (I googled for info on these repeasted and missing samples, but didn't find much)?

2) I've done wav compares before on tracks which had errors during extraction (pressed CDs) and always found the wavs to be identical. Is it because I'm using a CDR, or because the track on the CDR is a vinyl-rip...?

3) Most importantly, how sure can I be that I have a good rip of this track now>

Thanks

I've never used Wavecompare so I can't help you there.

The fact it came from a viynl rip is irrelevant. As far as the ripper is concerned it's a Red Book compliant PCM stream. The ripper does not know or care what the source of this file is. I suspect the reason you get a different result for each rip is that the CD-R itself is hard to read (the CD Recorder may have written the disc to fast, or might be a bad recorder in general, or might have problems with the particular CD-R media you used). This may be causing uncorrectable errors in the CD which would result in different output files.

If there are uncorrectable errors on the disc you can't be sure your rip is perfect unless you get 2 matching checksums.

Is this position somewhere in the middle of a track?
It seems that a portion of the stream - fraction of a second long - in one of the file was shifted forward by 66 samples. The created gap was filled with some samples and the created overlap was cut (missing samples).

("repeated samples" -- not quite sure. I'm guessing the 66 samples from just before the gap were repeated to fill the gap. This would mean that this file is not correct rip, most likely.)

I would try to rip it again, perhaps with a different drive and/or different program, and compare.

If 5:32 is the lenght of the track, then the CD recorder certainly operates in TAO (Track-At-Once), shutting off the laser between each track. It creates unreadable zones between the tracks.

If it is somewhere inside the track, this is a synch error. It can't be detected by C2. EAC without C2 sometimes detects them, sometimes not. Reducing the reading speed to 8x usually allows to get rid of them. On clean CDs, read errors often appear past 30x.