how to detect corrupted file

[frederic chaume]

Hi All

I found an option using exiv2 under windows

 >bin\exiv2.exe -pp -q P2280067_DxO-corrupted.jpg
Exiv2 exception in print action for file P2280067_DxO-corrupted.jpg:
P2280067_DxO-corrupted.jpg: The file contains data of an unknown image type

 >bin\exiv2.exe -pp -q P2280067_DxO.jpg
Preview 1: image/jpeg, 317x237 pixels, 17356 bytes

 >bin\exiv2.exe -pp -q .\P2280067.ORF
Preview 1: image/jpeg, 160x120 pixels, 9080 bytes
Preview 2: image/jpeg, 3200x2400 pixels, 1060974 bytes

I think that could be a good solution to find corrupted jpeg. Based on 
this I have some thought
- as exiv2 is native with Digikam, I guess such error could be visible? 
*Is there some "debug level" or some logs somewhere that could report 
such errors ?*
- I'm not expert on coding so don't know how to translate such command 
to a recursive search on a set of folders?
- seems to apply to raw also , but I don't have corrupted raw to perform 
the test

thanks to share your feedbacks and may be other option

Frederic




Le 11/04/2023 à 18:13, plowmail2010 at gmail.com a écrit :
>
> Yes, disk space can be a problem.  On the other hand, compare the cost 
> of disks to the value of your files.  1 TB SSD's run about $65 USD.  A 
> 2 TB disk is about $60.
> My search for "validate jpg files" revealed several candidates, but 
> they seem intended for programmer/geek people.  For example, the JPG 
> data begin with FFD8 hex and end with FFD9.  So all you need do is 
> find or write a program to test for those values. And sure enough, 
> people have done that, if you can figure out how to build/install on 
> unix/linux.
> Maybe this repair site will help: 
> https://online.officerecovery.com/pixrecovery/ I have not tried it.
> (Confession: I am a former programmer/geek.  Now I am just a geek.)
>
> Bob
>
> On 4/11/2023 10:51 AM, frederic chaume wrote:
>> I'm using FreefileSync each time I import new raw files. It includes 
>> a version management, but I had to remove it the because of the disk 
>> space used,  so today  I'm relying on the network trashbin plus a 
>> regular backup on an another disk.
>> But clearly not enough 🙁
>>
>> What could help is to be able to validate the integrity of the 
>> collections and/or the backup. So if any idea is welcome
>>
>> Frederic
>>
>>
>> Le 11/04/2023 à 16:34, plowmail2010 at gmail.com a écrit :
>>> On 4/11/2023 6:30 AM, frederic chaume wrote:
>>>> my concern is that running another backup may overwrite the correct 
>>>> file by a acorrupted version, that's why I'm trying to make a check 
>>>> before another backup
>>>
>>> Off on a tangent...
>>> If your backup procedure can overwrite older backups, you need to 
>>> use a better backup.
>>> I, too, am a victim of Windows.
>>> I use Macrium Reflect ($69 USD).
>>> I don't know how to make it overwrite earlier backups.  It's 
>>> probably impossible.
>>>
>>> Bob
>>>
>>
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