I've ripped with EAC one CD using two different drives, resulting in two different 'perfect' logs:
The 1st log is:
Exact Audio Copy V1.3 from 2. September 2016
EAC extraction logfile from 1. May 2018, 19:37
The Pleasure Fuckers / For Your Pleasure [1995 Roto Records RT-012-CD]
Used drive : HL-DT-STDVDRAM GH24LS50 Adapter: 1 ID: 1
Read mode : Secure
Utilize accurate stream : Yes
Defeat audio cache : Yes
Make use of C2 pointers : No
Read offset correction : 667
Overread into Lead-In and Lead-Out : No
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks : No
Null samples used in CRC calculations : Yes
Used interface : Native Win32 interface for Win NT & 2000
Gap handling : Appended to previous track
Used output format : User Defined Encoder
Selected bitrate : 256 kBit/s
Quality : High
Add ID3 tag : No
Command line compressor : D:\flac-1.3.2-win\win64\flac.exe
Additional command line options : -8 -e -V -T "ARTIST=%artist%" -T "TITLE=%title%" -T "ALBUM=%albumtitle%" -T "DATE=%year%" -T "TRACKNUMBER=%tracknr%" -T "GENRE=%genre%" -T "PERFORMER=%albuminterpret%" -T "COMPOSER=%composer%" %haslyrics%--tag-from-file=LYRICS="%lyricsfile%"%haslyrics% -T "ALBUMARTIST=%albumartist%" -T "DISCNUMBER=%cdnumber%" -T "TOTALDISCS=%totalcds%" -T "TOTALTRACKS=%numtracks%" -T "COMMENT=EAC 1.3 Burst Test&Copy + LITE-ON iHAS124 F + FLAC 1.3.2 64 bits Level 8" %source% -o %dest%
TOC of the extracted CD
Track | Start | Length | Start sector | End sector
---------------------------------------------------------
1 | 0:00.00 | 2:58.05 | 0 | 13354
2 | 2:58.05 | 2:22.20 | 13355 | 24024
3 | 5:20.25 | 3:11.25 | 24025 | 38374
4 | 8:31.50 | 4:03.05 | 38375 | 56604
5 | 12:34.55 | 2:15.17 | 56605 | 66746
6 | 14:49.72 | 2:29.30 | 66747 | 77951
7 | 17:19.27 | 3:02.45 | 77952 | 91646
8 | 20:21.72 | 1:48.15 | 91647 | 99761
9 | 22:10.12 | 3:14.70 | 99762 | 114381
10 | 25:25.07 | 2:41.18 | 114382 | 126474
11 | 28:06.25 | 2:58.42 | 126475 | 139866
12 | 31:04.67 | 3:19.05 | 139867 | 154796
13 | 34:23.72 | 2:43.10 | 154797 | 167031
14 | 37:07.07 | 3:27.23 | 167032 | 182579
Track 1
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\01. That Girl.wav
Pre-gap length 0:00:02.00
Peak level 98.0 %
Extraction speed 0.9 X
Track quality 100.0 %
Test CRC 98D3E157
Copy CRC 98D3E157
Track not present in AccurateRip database
Copy OK
Track 2
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\02. Hungry Man.wav
Pre-gap length 0:00:00.70
Peak level 98.0 %
Extraction speed 0.9 X
Track quality 100.0 %
Test CRC 8DEF7E99
Copy CRC 8DEF7E99
Track not present in AccurateRip database
Copy OK
Track 3
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\03. Captain Igloo.wav
Peak level 98.0 %
Extraction speed 1.1 X
Track quality 100.0 %
Test CRC A0AAD060
Copy CRC A0AAD060
Track not present in AccurateRip database
Copy OK
Track 4
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\04. 30 Seconds.wav
Pre-gap length 0:00:00.38
Peak level 98.0 %
Extraction speed 1.2 X
Track quality 100.0 %
Test CRC F8BBD8DD
Copy CRC F8BBD8DD
Track not present in AccurateRip database
Copy OK
Track 5
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\05. Watermouth.wav
Pre-gap length 0:00:00.25
Peak level 98.0 %
Extraction speed 1.2 X
Track quality 100.0 %
Test CRC 7BF85EFF
Copy CRC 7BF85EFF
Track not present in AccurateRip database
Copy OK
Track 6
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\06. Gin Blossom.wav
Peak level 98.0 %
Extraction speed 1.0 X
Track quality 99.9 %
Test CRC 7CE42C84
Copy CRC 7CE42C84
Track not present in AccurateRip database
Copy OK
Track 7
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\07. Whisky Heights.wav
Pre-gap length 0:00:00.22
Peak level 98.0 %
Extraction speed 1.1 X
Track quality 99.9 %
Test CRC 9560EB08
Copy CRC 9560EB08
Track not present in AccurateRip database
Copy OK
Track 8
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\08. Papel Morao.wav
Pre-gap length 0:00:01.17
Peak level 98.0 %
Extraction speed 1.0 X
Track quality 99.9 %
Test CRC B86FF368
Copy CRC B86FF368
Track not present in AccurateRip database
Copy OK
Track 9
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\09. Last Smoke Last Dime.wav
Pre-gap length 0:00:00.20
Peak level 98.0 %
Extraction speed 1.5 X
Track quality 100.0 %
Test CRC 338611C9
Copy CRC 338611C9
Track not present in AccurateRip database
Copy OK
Track 10
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\10. Gone Around The Bend.wav
Pre-gap length 0:00:01.27
Peak level 98.0 %
Extraction speed 1.4 X
Track quality 100.0 %
Test CRC F78EEDFE
Copy CRC F78EEDFE
Track not present in AccurateRip database
Copy OK
Track 11
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\11. Masacre En El Disco Bar.wav
Pre-gap length 0:00:00.33
Peak level 98.0 %
Extraction speed 1.5 X
Track quality 100.0 %
Test CRC 5071F9ED
Copy CRC 5071F9ED
Track not present in AccurateRip database
Copy OK
Track 12
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\12. Sexy French Motherfucker.wav
Pre-gap length 0:00:01.37
Peak level 98.0 %
Extraction speed 1.6 X
Track quality 100.0 %
Test CRC 672562D6
Copy CRC 672562D6
Track not present in AccurateRip database
Copy OK
Track 13
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\13. Watermouth Part II.wav
Pre-gap length 0:00:01.22
Peak level 100.0 %
Extraction speed 1.6 X
Track quality 100.0 %
Test CRC E82CAAA0
Copy CRC E82CAAA0
Track not present in AccurateRip database
Copy OK
Track 14
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\14. Socio De Satan.wav
Pre-gap length 0:00:00.52
Peak level 98.0 %
Extraction speed 1.8 X
Track quality 100.0 %
Test CRC 3AB7D24E
Copy CRC 3AB7D24E
Track not present in AccurateRip database
Copy OK
None of the tracks are present in the AccurateRip database
No errors occurred
End of status report
---- CUETools DB Plugin V2.1.6
[CTDB TOCID: IpwODQACtcZQXEfrQ3eMnA9dG.o-] found
Submit result: already submitted
Track | CTDB Status
1 | (3/3) Accurately ripped
2 | (2/3) Accurately ripped
3 | (3/3) Accurately ripped
4 | (3/3) Accurately ripped
5 | (3/3) Accurately ripped
6 | (3/3) Accurately ripped
7 | (3/3) Accurately ripped
8 | (3/3) Accurately ripped
9 | (3/3) Accurately ripped
10 | (3/3) Accurately ripped
11 | (3/3) Accurately ripped
12 | (3/3) Accurately ripped
13 | (3/3) Accurately ripped
14 | (3/3) Accurately ripped
The 2nd log is:
Exact Audio Copy V1.3 from 2. September 2016
EAC extraction logfile from 2. May 2018, 12:20
The Pleasure Fuckers / For Your Pleasure [1995 Roto Records RT-012-CD]
Used drive : ATAPI iHAS124 F Adapter: 1 ID: 0
Read mode : Secure
Utilize accurate stream : Yes
Defeat audio cache : Yes
Make use of C2 pointers : No
Read offset correction : 6
Overread into Lead-In and Lead-Out : No
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks : No
Null samples used in CRC calculations : Yes
Used interface : Native Win32 interface for Win NT & 2000
Gap handling : Appended to previous track
Used output format : User Defined Encoder
Selected bitrate : 256 kBit/s
Quality : High
Add ID3 tag : No
Command line compressor : D:\flac-1.3.2-win\win64\flac.exe
Additional command line options : -8 -e -V -T "ARTIST=%artist%" -T "TITLE=%title%" -T "ALBUM=%albumtitle%" -T "DATE=%year%" -T "TRACKNUMBER=%tracknr%" -T "GENRE=%genre%" -T "PERFORMER=%albuminterpret%" -T "COMPOSER=%composer%" %haslyrics%--tag-from-file=LYRICS="%lyricsfile%"%haslyrics% -T "ALBUMARTIST=%albumartist%" -T "DISCNUMBER=%cdnumber%" -T "TOTALDISCS=%totalcds%" -T "TOTALTRACKS=%numtracks%" -T "COMMENT=EAC 1.3 Burst Test&Copy + LITE-ON iHAS124 F + FLAC 1.3.2 64 bits Level 8" %source% -o %dest%
TOC of the extracted CD
Track | Start | Length | Start sector | End sector
---------------------------------------------------------
1 | 0:00.00 | 2:58.05 | 0 | 13354
2 | 2:58.05 | 2:22.20 | 13355 | 24024
3 | 5:20.25 | 3:11.25 | 24025 | 38374
4 | 8:31.50 | 4:03.05 | 38375 | 56604
5 | 12:34.55 | 2:15.17 | 56605 | 66746
6 | 14:49.72 | 2:29.30 | 66747 | 77951
7 | 17:19.27 | 3:02.45 | 77952 | 91646
8 | 20:21.72 | 1:48.15 | 91647 | 99761
9 | 22:10.12 | 3:14.70 | 99762 | 114381
10 | 25:25.07 | 2:41.18 | 114382 | 126474
11 | 28:06.25 | 2:58.42 | 126475 | 139866
12 | 31:04.67 | 3:19.05 | 139867 | 154796
13 | 34:23.72 | 2:43.10 | 154797 | 167031
14 | 37:07.07 | 3:27.23 | 167032 | 182579
Track 1
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\01. That Girl.wav
Pre-gap length 0:00:02.00
Peak level 98.0 %
Extraction speed 3.1 X
Track quality 100.0 %
Test CRC 98D3E157
Copy CRC 98D3E157
Track not present in AccurateRip database
Copy OK
Track 2
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\02. Hungry Man.wav
Pre-gap length 0:00:00.70
Peak level 98.0 %
Extraction speed 3.3 X
Track quality 100.0 %
Test CRC 92DB46A1
Copy CRC 92DB46A1
Track not present in AccurateRip database
Copy OK
Track 3
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\03. Captain Igloo.wav
Peak level 98.0 %
Extraction speed 3.8 X
Track quality 100.0 %
Test CRC A0AAD060
Copy CRC A0AAD060
Track not present in AccurateRip database
Copy OK
Track 4
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\04. 30 Seconds.wav
Pre-gap length 0:00:00.38
Peak level 98.0 %
Extraction speed 4.2 X
Track quality 100.0 %
Test CRC F8BBD8DD
Copy CRC F8BBD8DD
Track not present in AccurateRip database
Copy OK
Track 5
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\05. Watermouth.wav
Pre-gap length 0:00:00.25
Peak level 98.0 %
Extraction speed 4.0 X
Track quality 100.0 %
Test CRC 7BF85EFF
Copy CRC 7BF85EFF
Track not present in AccurateRip database
Copy OK
Track 6
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\06. Gin Blossom.wav
Peak level 98.0 %
Extraction speed 3.1 X
Track quality 99.9 %
Test CRC 7CE42C84
Copy CRC 7CE42C84
Track not present in AccurateRip database
Copy OK
Track 7
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\07. Whisky Heights.wav
Pre-gap length 0:00:00.22
Peak level 98.0 %
Extraction speed 3.6 X
Track quality 99.9 %
Test CRC 9560EB08
Copy CRC 9560EB08
Track not present in AccurateRip database
Copy OK
Track 8
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\08. Papel Morao.wav
Pre-gap length 0:00:01.17
Peak level 98.0 %
Extraction speed 3.0 X
Track quality 99.9 %
Test CRC B86FF368
Copy CRC B86FF368
Track not present in AccurateRip database
Copy OK
Track 9
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\09. Last Smoke Last Dime.wav
Pre-gap length 0:00:00.20
Peak level 98.0 %
Extraction speed 5.0 X
Track quality 100.0 %
Test CRC 338611C9
Copy CRC 338611C9
Track not present in AccurateRip database
Copy OK
Track 10
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\10. Gone Around The Bend.wav
Pre-gap length 0:00:01.27
Peak level 98.0 %
Extraction speed 5.0 X
Track quality 100.0 %
Test CRC F78EEDFE
Copy CRC F78EEDFE
Track not present in AccurateRip database
Copy OK
Track 11
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\11. Masacre En El Disco Bar.wav
Pre-gap length 0:00:00.33
Peak level 98.0 %
Extraction speed 5.3 X
Track quality 100.0 %
Test CRC 5071F9ED
Copy CRC 5071F9ED
Track not present in AccurateRip database
Copy OK
Track 12
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\12. Sexy French Motherfucker.wav
Pre-gap length 0:00:01.37
Peak level 98.0 %
Extraction speed 5.6 X
Track quality 100.0 %
Test CRC 672562D6
Copy CRC 672562D6
Track not present in AccurateRip database
Copy OK
Track 13
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\13. Watermouth Part II.wav
Pre-gap length 0:00:01.22
Peak level 100.0 %
Extraction speed 5.5 X
Track quality 100.0 %
Test CRC E82CAAA0
Copy CRC E82CAAA0
Track not present in AccurateRip database
Copy OK
Track 14
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\14. Socio De Satan.wav
Pre-gap length 0:00:00.52
Peak level 98.0 %
Extraction speed 5.9 X
Track quality 100.0 %
Test CRC 3AB7D24E
Copy CRC 3AB7D24E
Track not present in AccurateRip database
Copy OK
None of the tracks are present in the AccurateRip database
No errors occurred
End of status report
---- CUETools DB Plugin V2.1.6
[CTDB TOCID: IpwODQACtcZQXEfrQ3eMnA9dG.o-] found
Submit result: already submitted
Track | CTDB Status
1 | (3/3) Accurately ripped
2 | (1/3) Accurately ripped, or (2/3) differs in 4 samples @00:28:29
3 | (3/3) Accurately ripped
4 | (3/3) Accurately ripped
5 | (3/3) Accurately ripped
6 | (3/3) Accurately ripped
7 | (3/3) Accurately ripped
8 | (3/3) Accurately ripped
9 | (3/3) Accurately ripped
10 | (3/3) Accurately ripped
11 | (3/3) Accurately ripped
12 | (3/3) Accurately ripped
13 | (3/3) Accurately ripped
14 | (3/3) Accurately ripped
If you are sure that your rip contains errors, you can use CUETools to repair it.
The problem is that for Track 2 the obtained CRCs are different in both logs:
CRC for Track 2 @ 1st log:Track 2
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\02. Hungry Man.wav
Pre-gap length 0:00:00.70
Peak level 98.0 %
Extraction speed 0.9 X
Track quality 100.0 %
Test CRC 8DEF7E99
Copy CRC 8DEF7E99
Track not present in AccurateRip database
Copy OKCRC for Track 2 @ 2nd log:Track 2
Filename E:\The Pleasure Fuckers - (1995) - For Your Pleasure [1995 Roto Records RT-012-CD] · [FLAC EAC]\02. Hungry Man.wav
Pre-gap length 0:00:00.70
Peak level 98.0 %
Extraction speed 3.3 X
Track quality 100.0 %
Test CRC 92DB46A1
Copy CRC 92DB46A1
Track not present in AccurateRip database
Copy OKComparing the audio data in both tracks (with the foobar2000 bit-compare plug-in), it happens that there is a 4 sample difference:
Comparing:
"E:\Buffer\A\02. Hungry Man.flac"
"E:\Buffer\B\02. Hungry Man.flac"
Compared 6273960 samples.
Differences found: 4 values, starting at 0:28.392925, peak: 0.0916138 at 0:28.392925, 1ch
Channel difference peaks: 0.0916138 0.0146790
File #1 peaks: 0.9803162 0.9801025
File #2 peaks: 0.9803162 0.9801025
Detected offset as 0 samples.
How is it possible to obtain two different 'perfect' rips of the same CD?. If both extractions are 'perfect', which one is the good one?
I'm a little bit shocked and confused with this result.
Some ideas?
Thanks in advance.
"Perfect" just means that EAC always got the same result when reading those samples with each drive. There's no AccurateRip entry for that CD but CTDB reports 3 rips. Assuming the other 2 aren't also your own submissions, personally I'd go with the first rip, as it agreed with the other 2.
Try a burst test & copy with both drives in EAC, and try CUERipper too.
All 3 CTDB results are from the OP. Once with the GH24LS50 drive. Once with the iHAS124 drive (all tracks matching the rip from the GH24LS50 drive). Once with the iHAS124 drive (4 samples differ on track 2).
https://dbpoweramp.com/spoons-audio-guide-cd-ripping.htm
Secure Ripping
[...]
Re-Reading
CD is read twice, if a section contains an error it will likely return different errors, so can be detected. This is true mostly but not always, consistent errors exist...
It is possible for one drive to consistently read the 4 samples one way while the other drive consistently reads them another. One possible explanation is that the CD has a minor manufacturing flaw causing this behavior.
As for "which one is the good one? "
Either, neither, but can you hear a difference?
I have seen this; it is not all that unusual. Majority rule is a stupid way to choose.
Personally, I would load each version into Adobe Audition duplicate one version and subtract the other version from the duplicate version. Zoom in on the difference and mark with cue points. Load all three in the multitrack editor, select over the range marked by the cue points and look at each track. You will most likely see linear interpolation on the bad track. Keep the other track.
I normally don't field these types of questions anymore, but since there is a much more definitive way I thought I'd share it. Hopefully this information will be passed along.
All 3 CTDB results are from the OP. Once with the GH24LS50 drive. Once with the iHAS124 drive (all tracks matching the rip from the GH24LS50 drive). Once with the iHAS124 drive (4 samples differ on track 2).
Yes, all CTDB results are mine, from previous test extractions. All of which consistently yielded the same 4 sample difference.
https://dbpoweramp.com/spoons-audio-guide-cd-ripping.htm
Secure Ripping
[...]
Re-Reading
CD is read twice, if a section contains an error it will likely return different errors, so can be detected. This is true mostly but not always, consistent errors exist...
It is possible for one drive to consistently read the 4 samples one way while the other drive consistently reads them another. One possible explanation is that the CD has a minor manufacturing flaw causing this behavior.
Ok, Thanks, at least I know that this can happen.
As for "which one is the good one? "
Either, neither, but can you hear a difference?
Probably not, is just that I was curious and confused about this strange behavior ;)
I have seen this; it is not all that unusual. Majority rule is a stupid way to choose.
Personally, I would load each version into Adobe Audition duplicate one version and subtract the other version from the duplicate version. Zoom in on the difference and mark with cue points. Load all three in the multitrack editor, select over the range marked by the cue points and look at each track. You will most likely see linear interpolation on the bad track. Keep the other track.
I normally don't field these types of questions anymore, but since there is a much more definitive way I thought I'd share it. Hopefully this information will be passed along.
Great. I will try to do it as soon as I have some free time. I will post the results.
Thank you very much :)
You can also generate spectrograms of sufficient resolution of both files, making sure they are time-aligned first (which they are in this case), and compare them. The tool of my choice would be SoX, as it gives consistent zoom level (specified with -X). Interpolated samples will show up as lines near the nyquist frequency, which will stand out if those are the only differences. This method also works if the waveform happens to be too chaotic to see a faint click or an interpolated segment.
Thank you, I will try that too. I suppose you mean Nyquist Frequency = 44.1 / 2 = 22.05 kHz.
You can also generate spectrograms of sufficient resolution of both files, making sure they are time-aligned first (which they are in this case), and compare them. The tool of my choice would be SoX, as it gives consistent zoom level (specified with -X). Interpolated samples will show up as lines near the nyquist frequency, which will stand out if those are the only differences. This method also works if the waveform happens to be too chaotic to see a faint click or an interpolated segment.
Depending on how the compressed the content is, there may already be a sea of lines near Nyquist, making it difficult to identify any additional ones.
I have found it quite easy to spot interpolation in chaotic waveforms, perhaps more so than less chaotic waveforms. It is also extremely easy to look at the values of the sample in question as well as its neighbors to determine if they are interpolated.
Depending on how the compressed the content is, there may already be a sea of lines near Nyquist, making it difficult to identify any additional ones.
I have found it quite easy to spot interpolation in chaotic waveforms, perhaps more so than less chaotic waveforms. It is also extremely easy to look at the values of the sample in question as well as its neighbors to determine if they are interpolated.
Yes. In this case it's only a 4 samples anomaly, so it should be easy to detect artifacts just by inspecting the numerical value of the suspicious samples.