Detecting Manipulated Video Loop on CCTV

[Astor22x 0]

Hello,

 

ive got a request from a customer.

He told me that some employee manipulated the cctv recording.

There is a Video Sequence repeating 3 times the Same interaction.

 

How difficult is it to manipulate recordings and place a video loop like we see it in some hollywood movies

 

Kind Regards,

 

Alexander

[Astor22x 0]

???

No One who can tell me if its a technical defect or really manipulated ?

[Daryl733 0]

If you required replies, you should provide more details.

What brand/models of equipment, analogue or ip system. Otherwise how to reply you ?

 

If it's an ancient analogue system using tape, the tape could be manipulated by recording an older clip over a couple of times.

 

If you are using IP cameras that ftp to a NAS or record using a PC that store the files in sequential files on the system, all it takes is to delete the file and replaced it with a couple of older files and rename them to the deleted files.

 

Here are some read up if you think the employee is hacker graded, but if that's the case, most likely he won't be working there for long as well. Bank/Casino heist might be more lucrative. Think Ocean XXX....

 

http://www.wired.com/2009/07/video-hijack/

http://videojak.sourceforge.net/

 

Most likely it's a recording error. Check the DVR or the HDD. Could be system hung during that period. The obvious explanation is most often the correct one in most cases.

 

If you suspect it happens on regular basis, easiest way is to install a analogue/digital clock in view of the camera view. The time would correspond to your recording date/time if both time are set correctly. Install a digital one with Date as well if you are afraid the employee uses previous/other day recording to overwrite the data.