Currently, the central element of modern video surveillance systems are digital video recorders (DVR / NVR / HVR), in most cases, produce video recording format h264. In the event of any incident data from the hard disk recorder can be an important source of information. However, quite often it happens that the recording device was fixed to some incident, and view or save the video fails.
The reasons may be different:
Provided that the hard drive is operational, we can try to restore the Audio / Video data from virtually any model of DVR. There are many manufacturers of video recorders. Unfortunately, the standard data recording to the DVR exists. Almost all manufacturers use specific algorithms (format) records, which may differ significantly even between models of the same manufacturer. At the same time any documentation with descriptions of these formats, producers are not available in the public domain is not available. Our company has developed its own methods and algorithms to restore the video to the hard disk video recorders, which in most cases can achieve positive results in the reduction of data.
In most cases we are approached with a request to restore data after an attempt to connect the hard drive of the DVR to the computer. Indeed, when there is a need to review the vast amount of records, it appears that to do so means the DVR is not very convenient. And once there is a desire to connect the drive to your computer and view the video in a more comfortable player. But the first attempt ends in failure - the computer files on the disk does not see, and if they see any one player, they do not reproduce. In addition, another unpleasant surprise lies ahead - after failing to connect a hard drive to your computer, video recorder, too, ceases to see the video and offers re-format the drive!
This is because many DVRs do not use the usual for Windows file system FAT32, or NTFS, and a known user Linux Ext3, or RAW. As a result, Windows, not on the hard drive to find a familiar file system thinks the drive is empty and initializes it, thus overwriting important data recorder.
After the successful recovery of data to sort by date and camera. Note: Sorting by cameras do not always succeed. All recovered data is written to the hard disk capacity required. Files after recovery can be viewed on any computer using common software for viewing video. Note: The hard disk for recording data recovery results must be provided by the client.