The source file '<Unknown>' is corrupt or invalid at offset

[duffgardens]

my title length minimum was too high in the first attempt, so i lowered it from 120 to 110, then i got the errors below.
it presented a 2 chapter, 126MB file that when ripped was in fact 2 minutes of black.

Drive Information
OS device name: /dev/rdisk5
Current profile: DVD-ROM
Manufacturer: HL-DT-ST
Product: DVD-RW GH41N
Revision: PQ04
Firmware date: 2008-12-05 12:34:56

Disc Information
Label: DARKEST_HOUR
Timestamp: 2017-10-16 13:43:53
Data capacity: 7.11 Gb
Disc type: DVD-ROM
Disc size: 120mm
Maximum read rate: 10.08 Mbps [1x]
Number of layers: 2 (OTP)


MakeMKV v1.10.8 darwin(x64-release) started
Debug logging enabled, log will be saved as /Users/xxxx/MakeMKV_log.txt
Optical drive "DVD+R-DL HL-DT-ST DVD-RW GH41N PQ04d" opened in OS access mode.
Optical drive "BD-ROM HL-DT-ST BDDVDRW CT10N WA02d" opened in OS access mode.
Using direct disc access mode
Calculated BUP offset for VTS #0 does not match one in IFO header.
Calculated BUP offset for VTS #2 does not match one in IFO header.
DEBUG: Code 1 at I-3VGY'}BLG ]1:29395356
Title #1 has length of 118 seconds which is less than minimum title length of 120 seconds and was therefore skipped
Title #1 with special attributes was skipped
Title #2 with special attributes was skipped
Failed to open disc
Using direct disc access mode
Calculated BUP offset for VTS #0 does not match one in IFO header.
Calculated BUP offset for VTS #2 does not match one in IFO header.
DEBUG: Code 1 at I-3VGY'}BLG ]1:29395356
Title #1 was added (2 cell(s), 0:01:58)
Title #1 with special attributes was skipped
Title #2 with special attributes was skipped
Operation successfully completed
Saving 1 titles into directory /Users/xxxx/Downloads/MakeMKV2017
DEBUG: Code 0 at =y>LZ2@}:5(Fb$2n':121262026
DEBUG: Code 0 at =y>LZ2@}:5(Fb$2n':121262026
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 1388544, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 2455552, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 3522560, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 4589568, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 5656576, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 6723584, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 7790592, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 8857600, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 9924608, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 10991616, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 12058624, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 13125632, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 14192640, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 15259648, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 16326656, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 17393664, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 18460672, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 19527680, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 20594688, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 21661696, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 22728704, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 23795712, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 24862720, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 25929728, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 26996736, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 28063744, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 29130752, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 30197760, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 31264768, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 32331776, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 33398784, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 34465792, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 35532800, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 36599808, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 37666816, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 38733824, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 39800832, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 40867840, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 41934848, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 43001856, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 44068864, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 45135872, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 46202880, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 47269888, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 48336896, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 49403904, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 50470912, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 51537920, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 52604928, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 53671936, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 54738944, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 55805952, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 56872960, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 57939968, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 59006976, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 60073984, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 61140992, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 62208000, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 63275008, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 64342016, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 65409024, attempting to work around
The source file '<Unknown>' is corrupt or invalid at offset 66154496, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 1388544, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 2455552, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 3522560, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 4589568, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 5656576, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 6723584, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 7790592, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 8857600, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 9924608, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 10991616, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 12058624, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 13125632, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 14192640, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 15259648, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 16326656, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 17393664, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 18460672, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 19527680, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 20594688, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 21661696, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 22728704, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 23795712, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 24862720, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 25929728, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 26996736, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 28063744, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 29130752, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 30197760, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 31264768, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 32331776, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 33398784, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 34465792, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 35532800, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 36599808, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 37666816, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 38733824, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 39800832, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 40867840, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 41934848, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 43001856, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 44068864, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 45135872, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 46202880, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 47269888, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 48336896, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 49403904, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 50470912, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 51537920, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 52604928, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 53671936, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 54738944, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 55805952, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 56872960, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 57939968, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 59006976, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 60073984, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 61140992, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 62208000, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 63275008, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 64342016, attempting to work around
The source file '/VIDEO_TS/VTS_01_1.VOB' is corrupt or invalid at offset 65409024, attempting to work around
The source file '<Unknown>' is corrupt or invalid at offset 66154496, attempting to work around
The source file '<Unknown>' is corrupt or invalid at offset 66154496, attempting to work around
The source file '<Unknown>' is corrupt or invalid at offset 66154496, attempting to work around
1 titles saved

[Woodstock]

Most likely cause is a dirty disk, but... Which drive did you try ripping the disk with? Some DVDs do NOT work with the blue laser in BD drives. It is rare, but it does happen... which is why I keep a couple of DVD drives handy.

[duffgardens]

the first attempt was with my cheesegrater macpro superdrive.

a second attempt was made with the external bd drive (HL-DT-ST BDDVDRW CT10N),
these are the results (i also microfibered the disc a bit). it returned a file of 126MB length.

Drive Information
OS device name: /dev/rdisk7
Current profile: DVD-ROM
Manufacturer: HL-DT-ST
Product: BDDVDRW CT10N
Revision: WA02
Serial number: K0088M93137
Firmware date: 2008-08-11 12:34:56

Disc Information
Label: DARKEST_HOUR
Timestamp: 2017-10-16 13:43:53
Data capacity: 7.11 Gb
Disc type: DVD-ROM
Disc size: 120mm
Maximum read rate: 10.08 Mbps [1x]
Number of layers: 2 (OTP)

MakeMKV v1.10.8 darwin(x64-release) started
Debug logging enabled, log will be saved as /Users/xxxx/MakeMKV_log.txt
Optical drive "DVD+R-DL HL-DT-ST DVD-RW GH41N PQ04d" opened in OS access mode.
Optical drive "BD-ROM HL-DT-ST BDDVDRW CT10N WA02d" opened in OS access mode.
DEBUG: Code 0 at qVQM1'P_xNYX'Gv3~bqa$+/'B:121263153
Using direct disc access mode
Calculated BUP offset for VTS #0 does not match one in IFO header.
Calculated BUP offset for VTS #2 does not match one in IFO header.
DEBUG: Code 1 at I-3VGY'}BLG ]1:29395356
Title #1 was added (2 cell(s), 0:01:58)
Title #1 with special attributes was skipped
Title #2 with special attributes was skipped
Operation successfully completed