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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 27 Apr 2016 (Wednesday) 14:46
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1D X Mark II Owners Unite! Discuss & Post Photos

 
cheffievrs
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Jun 10, 2016 23:27 |  #1306

With these issues of corrupt files, it's defiantly putting me of getting one at the moment, fingers crossed for an update..


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jwcdds
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Jun 10, 2016 23:34 |  #1307

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HKFEVER
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Jun 11, 2016 00:01 |  #1308

sploo wrote in post #18035457 (external link)
That's.... strange. It makes no sense that opening a file direct from the card and finding it's corrupted (which is I assume what you meant by "I discovered that same files were corrupted in CF") would then see the file being OK once copied onto a computer.

Does the iMac have an md5 utility (or one you could download)? Run it against a file (the "good" file on the computer and the same "bad" file on the CF card). You'll get a hash code for the each file - they should be the same. If they're not then something very strange is going on.

Just use Mac's Terminal and ran MD5 the result for the _X2_0431.cr2 are:
good file with 6b1873ddcb8268b3739436​925d4d4ce5
bad file with f2dbdce652c274f3b66838​b54a2dfb28

Good file is like this after PS conversion:

IMAGE: http://www.pbase.com/hkfever/image/163412882/large.jpg

Bad file is like this after PS conversion:
IMAGE: http://www.pbase.com/hkfever/image/163422903/large.jpg

Bad file is like this after DPP4 conversion:
IMAGE: http://www.pbase.com/hkfever/image/163422904/large.jpg



  
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Dankata
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Jun 11, 2016 00:42 |  #1309

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Gadget-Guy
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Jun 11, 2016 03:10 as a reply to  @ post 18035025 |  #1310

Many thanks :-)


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Gadget-Guy
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Jun 11, 2016 03:11 as a reply to  @ post 18035303 |  #1311

Thank you :-)


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David ­ Ransley
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Post edited over 3 years ago by David Ransley. (2 edits in all)
     
Jun 11, 2016 03:15 as a reply to  @ post 18035616 |  #1312

Should be interesting to see if the before and after file has the same checksum. A tool like this one may assist: https://www.microsoft.​com …oad/details.asp​x?id=11533 (external link). It has the ability to calculate a MD5 hash of a file. The two files must have different hash results if they are different and therefore corrupted.


DRH

  
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HKFEVER
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Jun 11, 2016 03:22 |  #1313

David Ransley wrote in post #18035813 (external link)
Should be interesting to see if the before and after file has the same checksum. A tool like this one may assist: https://www.microsoft.​com …oad/details.asp​x?id=11533 (external link). It has the ability to calculate a MD5 hash of a file. The two files must have different hash results if they are different and therefore corrupted.


Any comment on this:
Just use Mac's Terminal and ran MD5 the result for the _X2_0431.cr2 are:
good file with 6b1873ddcb8268b3739436​925d4d4ce5
bad file with f2dbdce652c274f3b66838​b54a2dfb28




  
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robamy
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Jun 11, 2016 05:09 |  #1314

A few from yesterday, I did some 120fps video yesterday, cool stuff. The 4k screen grabs continue to amaze me with the detail. This camera just makes photography/video work fun. Sorry for the few that are having issues.

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andrewjy
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Jun 11, 2016 06:34 |  #1315

HKFEVER wrote in post #18035819 (external link)
Any comment on this:
Just use Mac's Terminal and ran MD5 the result for the _X2_0431.cr2 are:
good file with 6b1873ddcb8268b3739436​925d4d4ce5
bad file with f2dbdce652c274f3b66838​b54a2dfb28

I'm assuming the previous good .CR2 file is now a permanently bad .CR2 file.

I'm also assuming that you're running md5 on the .CR2 file and not the .JPG file?




  
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David ­ Ransley
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Jun 11, 2016 06:36 |  #1316

HKFEVER wrote in post #18035819 (external link)
Any comment on this:
Just use Mac's Terminal and ran MD5 the result for the _X2_0431.cr2 are:
good file with 6b1873ddcb8268b3739436​925d4d4ce5
bad file with f2dbdce652c274f3b66838​b54a2dfb28

The two values differ, which confirms that something updated the content. If the numbers were the same, then the content was never changed. If this was a legitimate update by some driver or code section, it should have also updated the date on the file when this took place. The modified date should change and the corruption is then a bug somewhere in a code section. It will provide an indication of when this happened.

If the file shows the same properties, then the corruption is normally "external". In other words, the file wasn't read and saved back programmatically as part of a designed process. What is puzzling is the isolated nature of the event. We don't see many people with the issue, hence there must be something special in the environment. Example - antivirus application scanning the read process.

A quick search shows that Apple may just be part of the problem:

1. http://www.canonrumors​.com/forum/index.php?t​opic=29797.0 (external link) (here the copy destroyed the source)
2. http://www.fredmiranda​.com/testforum/topic/1​428459/3 (external link) (here it is seems that the first MAC copy worked, but then copy process to a second system broke the files)

Something is writing back for sure. Image is fine until it is processed and then read into another system. Searching the Internet for what is in the files, I found that Canon keeps the secret, but others are trying to unravel the specification: http://lclevy.free.fr/​cr2/ (external link). (I searched for a tool that could dump the CR2 header).


DRH

  
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HKFEVER
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Jun 11, 2016 09:14 |  #1317

andrewjy wrote in post #18035898 (external link)
I'm assuming the previous good .CR2 file is now a permanently bad .CR2 file.

I'm also assuming that you're running md5 on the .CR2 file and not the .JPG file?

I have a good copy of the GOOD Raw CR2.
I have a copy of the CORRUPTED CR2.

The md5 data are from GOOD Raw CR2 and CORRUPTED CR2. Not from JPG.




  
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Gadget-Guy
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Jun 11, 2016 09:43 |  #1318

Interesting to see that a few other 1DX MKII users are experiencing lock ups that require a battery pull when using bigger primes for high paced sports etc on other forums the same as i had experienced shooting superbikes.


The equipment you'll leave at home will be the equipment you'll need the most!
Murphy's Law

  
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HKFEVER
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Jun 11, 2016 10:47 |  #1319

Gadget-Guy wrote in post #18036023 (external link)
Interesting to see that a few other 1DX MKII users are experiencing lock ups that require a battery pull when using bigger primes for high paced sports etc on other forums the same as i had experienced shooting superbikes.


Guinea pig :(
Canon should pay us for their R&D :(




  
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Gadget-Guy
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Post edited over 3 years ago by Gadget-Guy.
     
Jun 11, 2016 11:28 as a reply to  @ HKFEVER's post |  #1320

Strange though that it's been working fine with all my other lenses and even covering an airshow but the moment I shoot constant bursts of 3-5 frames over a period of time with large primes it bricks.

Can't reproduce it just shooting static items but head on with bikes it does it fairly regular but not all of the time.

Have tried CF and CFast now and even different types and also cleaned the lens contacts etc so just need another bike meeting in a few weeks time to try and reproduce and then video the fault.

You hear the mirror lock up and can see the A/F point fade away in the viewfinder along with all other info and just the rear and top displays stay on regardless of the power switch.

Have still only found three other posts with the identical issue and all have been sports shooters one of which had both his bodies with the same fault along with a getty images photographer experiencing the same issue while using big primes.


The equipment you'll leave at home will be the equipment you'll need the most!
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