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Nextbase Dashcam - Sandisk 128GB MicroSD corrupted
Posted: 28 Feb 2024, 14:43
by whiteduck
A previously working and regularly reformatted MicroSD card from a Nextbase Dashcam 522GW lost all files after plugging into my Mac... all that is on there now is the .VT100Spotlight folder that the Mac indexes searches with. The drive would normally have a label of NEXTBASE - this is missing.
Photorec manages to recover >1000 files but most of these (which are MP4 format as seen as MOV by Photorec) cannot be opened... I know often this is considered to be fragmentation but oddly I can read 66 files and a bunch of text files that hold the dashcam status. Would I be able to read any of the .mov files if .mdat/ftyp fragmentation was at play. The Nextbase writes a small preview AND a larger full resolution file - they are not identical sizes but follow that pattern. The card was formatted before these files were written so there should be no over-writing taking place.
Running hexdumps:
These two work and are 1 minute (the Nextbase default) long:
Code: Select all
f7408128_ftyp.mov
00000000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
00000010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
00000020 0a 2b bf 38 6d 64 61 74 00 00 00 02 09 10 00 00 |.+.8mdat........|
00000030 00 13 06 00 0d 80 af c8 00 00 03 00 00 af c8 00 |................|
00000040 00 03 00 40 80 00 00 00 0e 06 01 09 00 3c 08 24 |...@.........<.$|
00000050 68 00 00 03 00 01 80 00 00 00 05 06 06 01 c4 80 |h...............|
00000060 00 04 7c 04 25 88 80 20 00 4c c6 f5 66 33 27 0b |..|.%.. .L..f3'.|
00000070 d0 ce b3 93 4a 2f 47 e6 ab f2 f6 7c 45 25 1d d4 |....J/G....|E%..|
00000080 dc 43 4d 26 fe 24 1c 7d 0e 56 12 e2 55 be 46 68 |.CM&.$.}.V..U.Fh|
00000090 7f d2 fe 9c 1b 8d 90 09 8f 11 b4 4d 74 48 9d e3 |...........MtH..|
f7428608_ftyp.mov
00000000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
00000010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
00000020 00 9c 20 78 6d 64 61 74 00 00 00 02 09 10 00 00 |.. xmdat........|
00000030 00 13 06 00 0d 80 af c8 00 00 03 00 00 af c8 00 |................|
00000040 00 03 00 40 80 00 00 00 0e 06 01 09 00 3c 08 24 |...@.........<.$|
00000050 68 00 00 03 00 01 80 00 00 00 05 06 06 01 c4 80 |h...............|
00000060 00 00 46 c4 25 88 80 20 03 ff f2 1f 73 2e 4b 0c |..F.%.. ....s.K.|
00000070 b6 eb 4c 9d 7a ee d1 8d 29 16 20 7e aa ee 28 f4 |..L.z...). ~..(.|
00000080 9e f3 52 6f 02 f5 1c 0a 3b f7 90 81 54 83 2e 14 |..Ro....;...T...|
00000090 55 67 6d 20 af d5 ff e5 04 6e 56 57 ff 4c fb 51 |Ugm .....nVW.L.Q|
These two don't work:
Code: Select all
f7776768_ftyp.mov
00000000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
00000010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
00000020 0a af eb 5a 6d 64 61 74 00 00 00 02 09 10 00 00 |...Zmdat........|
00000030 00 13 06 00 0d 80 af c8 00 00 03 00 00 af c8 00 |................|
00000040 00 03 00 40 80 00 00 00 0e 06 01 09 00 3c 08 24 |...@.........<.$|
00000050 68 00 00 03 00 01 80 00 00 00 05 06 06 01 c4 80 |h...............|
00000060 00 04 91 24 25 88 80 20 00 4c c6 ea 6a 2b 81 58 |...$%.. .L..j+.X|
00000070 56 2b b4 ed 3f 26 c1 2e 10 68 85 20 8f cf f8 63 |V+..?&...h. ...c|
00000080 45 f3 7c bc 9a 83 56 15 71 22 6e 76 a5 b9 21 39 |E.|...V.q"nv..!9|
00000090 17 6c 7f e1 10 42 9a 4f 65 d4 c4 95 96 70 c9 13 |.l...B.Oe....p..|
f7797248_ftyp.mov
00000000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
00000010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
00000020 00 a7 94 3a 6d 64 61 74 00 00 00 02 09 10 00 00 |...:mdat........|
00000030 00 11 06 00 0d 80 af be 00 00 0a 00 af be 00 00 |................|
00000040 0a 40 80 00 00 00 0e 06 01 09 00 3c 08 24 68 00 |.@.........<.$h.|
00000050 00 03 00 01 80 00 00 00 05 06 06 01 c4 80 00 00 |................|
00000060 3b 26 25 88 80 20 00 df 00 2a d6 47 eb 2d 6c 1f |;&%.. ...*.G.-l.|
00000070 7e 88 4a 55 31 23 71 65 af 69 a3 d3 88 70 61 51 |~.JU1#qe.i...paQ|
00000080 03 87 00 9e 63 f8 1d 3a 18 57 01 a3 9c db e1 b7 |....c..:.W......|
00000090 d6 90 74 b5 1e 07 1e 96 ce 4e b9 e4 15 60 22 fc |..t......N...`".|
Code: Select all
total 740088
drwxr-xr-x 6 root staff 192 28 Feb 12:48 .
drwxr-xr-x 12 root staff 384 28 Feb 12:48 ..
-rw-r--r-- 1 root staff 178203180 27 Feb 22:59 f7408128_ftyp.mov
-rw-r--r-- 1 root staff 10431020 27 Feb 22:59 f7428608_ftyp.mov
-rw-r--r-- 1 root staff 179301242 27 Feb 22:59 f7776768_ftyp.mov
-rw-r--r-- 1 root staff 10982490 27 Feb 22:59 f7797248_ftyp.mov
Any suggestions would be most appreciated!
Thank you
Ian
Re: Nextbase Dashcam - Sandisk 128GB MicroSD corrupted
Posted: 28 Feb 2024, 15:38
by recuperation
I have no idea!
I am not familiar with the internals of this format.
This type of issue has appeared a couple of times in the forum:
viewtopic.php?p=23603&hilit=mp4+atom#p23603
Use the detailed search, using cgrenier aus author. Other keywords would be "mp4", "MOV" or "atom".
Re: Nextbase Dashcam - Sandisk 128GB MicroSD corrupted
Posted: 28 Feb 2024, 18:17
by whiteduck
Thanks yes I saw that post but it says if "all" your files are found to be unreadable you need to join ftyp+mdat where as in my case some are readable which suggests something else is happening... would reformatting the card in the dashcam help photorec understand the sectors / boundaries / geometry ?
Thanks for your guidance
Best regards
Ian
Re: Nextbase Dashcam - Sandisk 128GB MicroSD corrupted
Posted: 28 Feb 2024, 18:38
by recuperation
No! Formatting is a destructive operation which reduces chances of recovery.
Fragmentation is a symptom that reduces the chances of recovery as well.
If you are curious why some stuff was recovered and other stuff not you have to do your own research.
Re: Nextbase Dashcam - Sandisk 128GB MicroSD corrupted
Posted: 28 Feb 2024, 19:17
by whiteduck
OK - thank you. If in the meantime anyone else has experienced the same and found a fix / reason then I'd appreciate it. Unfortunately I wasted my money on Stellar Photo Recovery premium which has not been able to solve this either... it used the reference file method to try to rebuild the .MOV but that resulted in shorter videos with lots of distortion...
Re: Nextbase Dashcam - Sandisk 128GB MicroSD corrupted
Posted: 28 Feb 2024, 21:24
by whiteduck
Digging through a hexdump (not really knowing what to look for
- I can see the date / time of the video clips in both the readable and unreadable files which suggests they are not totally corrupted... this pattern repeats - as the time and GPS location changes.
unreadable file:
Code: Select all
00075760 00 00 00 00 32 30 32 34 30 32 31 38 31 33 30 39 |....202402181309|
00075770 30 31 00 00 00 05 00 00 00 00 00 00 c0 ff ff ff |01..............|
00075780 24 47 50 52 4d 43 2c 31 33 30 39 30 31 2e 39 30 |$GPRMC,130901.90|
00075790 30 2c 41 2c 35 30 34 31 2e 32 35 37 36 33 2c 4e |0,A,5041.25763,N|
000757a0 2c 30 30 34 31 30 2e 38 34 38 35 37 2c 57 2c 35 |,00410.84857,W,5|
000757b0 36 2e 31 33 38 2c 38 30 2e 36 32 2c 31 38 30 32 |6.138,80.62,1802|
000757c0 32 34 2c 2c 2c 41 2a 35 46 0d 0a 0a 00 00 00 00 |24,,,A*5F.......|
000757d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00075800 24 47 50 47 47 41 2c 31 33 30 39 30 31 2e 39 30 |$GPGGA,130901.90|
00075810 30 2c 35 30 34 31 2e 32 35 37 36 33 2c 4e 2c 30 |0,5041.25763,N,0|
00075820 30 34 31 30 2e 38 34 38 35 37 2c 57 2c 31 2c 31 |0410.84857,W,1,1|
00075830 31 2c 31 2e 32 31 2c 31 30 38 2e 34 2c 4d 2c 35 |1,1.21,108.4,M,5|
00075840 32 2e 30 2c 4d 2c 2c 2a 36 44 0d 0a 00 00 00 00 |2.0,M,,*6D......|
00075850 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
and the good file
Code: Select all
00077060 00 00 00 00 32 30 32 34 30 32 31 38 31 33 30 38 |....202402181308|
00077070 30 31 00 00 40 05 00 00 00 00 00 00 00 01 00 00 |01..@...........|
00077080 24 47 50 52 4d 43 2c 31 33 30 38 30 31 2e 39 30 |$GPRMC,130801.90|
00077090 30 2c 41 2c 35 30 34 30 2e 38 37 30 35 37 2c 4e |0,A,5040.87057,N|
000770a0 2c 30 30 34 31 32 2e 32 35 38 39 36 2c 57 2c 36 |,00412.25896,W,6|
000770b0 30 2e 37 30 39 2c 36 33 2e 33 35 2c 31 38 30 32 |0.709,63.35,1802|
000770c0 32 34 2c 2c 2c 41 2a 35 44 0d 0a 0a 00 00 00 00 |24,,,A*5D.......|
000770d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00077100 24 47 50 47 47 41 2c 31 33 30 38 30 31 2e 39 30 |$GPGGA,130801.90|
00077110 30 2c 35 30 34 30 2e 38 37 30 35 37 2c 4e 2c 30 |0,5040.87057,N,0|
00077120 30 34 31 32 2e 32 35 38 39 36 2c 57 2c 31 2c 31 |0412.25896,W,1,1|
00077130 33 2c 30 2e 38 33 2c 31 30 32 2e 35 2c 4d 2c 35 |3,0.83,102.5,M,5|
00077140 32 2e 30 2c 4d 2c 2c 2a 36 31 0d 0a 00 00 00 00 |2.0,M,,*61......|
00077150 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
Re: Nextbase Dashcam - Sandisk 128GB MicroSD corrupted
Posted: 28 Feb 2024, 21:59
by whiteduck
In case @cgrenier you wish to check the fingerprints of two files (a large and a small mp4) that do recover OK from the same SD card here goes... I wonder if some of the .mov files are sometimes missing the start or end of the file...
https://share.icloud.com/photos/00dPt39 ... pf4GRNXgxg - if the link expires let me know
Re: Nextbase Dashcam - Sandisk 128GB MicroSD corrupted
Posted: 28 Feb 2024, 22:27
by whiteduck
Doing a hexdump on a dd of the partition
mdat is listed but I couldn't get this to be recognised as a signature in photorec:
Code: Select all
dat 0 0x00e39bd86d646174
mp4 0 0x000000206674797061766331
Then doing an egrep on the disk image (dd) - for avc, mdat etc.
Code: Select all
0f740000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
0f740010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
0f740020 0d 1b 49 da 6d 64 61 74 00 00 00 02 09 10 00 00 |..I.mdat........|
10140000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
10140010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
10140020 00 e3 8c da 6d 64 61 74 00 00 00 02 09 10 00 00 |....mdat........|
1dd40000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
1dd40010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
1dd40020 0d 1d 4e 38 6d 64 61 74 00 00 00 02 09 10 00 00 |..N8mdat........|
1e740000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
1e740010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
1e740020 00 e3 9b d8 6d 64 61 74 00 00 00 02 09 10 00 00 |....mdat........|
2c340000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
2c340010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
2c340020 0c d5 81 da 6d 64 61 74 00 00 00 02 09 10 00 00 |....mdat........|
2cd40000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
2cd40010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
2cd40020 00 dc aa 7a 6d 64 61 74 00 00 00 02 09 10 00 00 |...zmdat........|
3a940000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
3a940010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
3a940020 0c d9 ca d8 6d 64 61 74 00 00 00 02 09 10 00 00 |....mdat........|
3b340000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
3b340010 61 76 63 31 69 73 6f 6d 00 00 00 00 00 00 00 00 |avc1isom........|
3b340020 00 dd a9 b8 6d 64 61 74 00 00 00 02 09 10 00 00 |....mdat........|
Re: Nextbase Dashcam - Sandisk 128GB MicroSD corrupted
Posted: 29 Feb 2024, 01:17
by whiteduck
Sorry for the spam - last post for tonight I promise - I looked for MP4 tags in a partial hexdump of the volume - I wonder if photorec doesn't recognise the format Nextbase use:
Code: Select all
% egrep "mdat|ftyp|meta|stts|stsc|stsz|mfra|moof|moov|pdin" image.hex
0b557510 e9 00 00 00 1c 73 74 73 63 00 00 00 00 00 00 00 |.....stsc.......|
0b557530 34 73 74 73 7a 00 00 00 00 00 00 00 00 00 00 07 |4stsz...........|
0b55aff0 00 00 04 00 00 00 02 00 00 00 18 73 74 74 73 00 |...........stts.|
0b55b010 00 00 1c 73 74 73 63 00 00 00 00 00 00 00 01 00 |...stsc.........|
0b55c0a0 47 65 6e 65 76 61 00 00 00 18 73 74 74 73 00 00 |Geneva....stts..|
0b55c0c0 00 1c 73 74 73 63 00 00 00 00 00 00 00 01 00 00 |..stsc..........|
0bb3fff0 00 00 00 00 3c 00 00 00 00 00 00 08 6d 65 74 61 |....<.......meta|
0f5d2b40 00 00 18 73 74 74 73 00 00 00 00 00 00 00 01 00 |...stts.........|
0f5d2b50 00 07 08 00 00 03 e9 00 00 00 1c 73 74 73 63 00 |...........stsc.|
0f5d2b70 00 00 01 00 00 1c 34 73 74 73 7a 00 00 00 00 00 |......4stsz.....|
0f5d6640 18 73 74 74 73 00 00 00 00 00 00 00 01 00 0e a8 |.stts...........|
0f5d6650 00 00 00 00 01 00 00 00 1c 73 74 73 63 00 00 00 |.........stsc...|
0f5d6670 01 00 00 00 14 73 74 73 7a 00 00 00 00 00 00 00 |.....stsz.......|
0f5d76f0 73 74 74 73 00 00 00 00 00 00 00 01 00 00 02 58 |stts...........X|
0f5d7700 00 00 00 64 00 00 00 1c 73 74 73 63 00 00 00 00 |...d....stsc....|
0f5d7720 00 00 09 74 73 74 73 7a 00 00 00 00 00 00 00 00 |...tstsz........|
0f73fff0 00 00 00 00 3c 00 00 00 00 00 00 08 6d 65 74 61 |....<.......meta|
0f740000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
0f740020 0d 1b 49 da 6d 64 61 74 00 00 00 02 09 10 00 00 |..I.mdat........|
10140000 00 00 00 20 66 74 79 70 61 76 63 31 00 00 00 00 |... ftypavc1....|
10140020 00 e3 8c da 6d 64 61 74 00 00 00 02 09 10 00 00 |....mdat........|
Re: Nextbase Dashcam - Sandisk 128GB MicroSD corrupted
Posted: 01 Mar 2024, 19:58
by whiteduck
An update for anyone who is following this thread. I found the website fix.video and so far 4/4 files I've uploaded (170MB-220MB) have been fixable - I had to adjust the fps to 30fps else the video was not the correct length and perhaps some may have some errors but on this small selection it's working...
Current profile: 1/1 Profile Name: ambarella - generic - 2560x1440
So this would suggest the files are not entirely corrupted but clearly I need to try more... I wonder if ffmpeg or photorec could work?
Video Information
Duration:1 min 14 s (this one appears to be longer than it should by 14s)
Container:QuickTime / MOV
Video Size:2560x1440
Codec Video:h264 (Main)
Bitrate Video:22.2 Mb/s
FrameRate:30.000 FPS
Aspect Ratio:16:9
Audio Format:null (correct because these videos don't have sound)
Audio Codec:null
Audio Bitrate:0.0 Kb/s
Best regards
Ian