malaman

Hi all I have a Sunluxy H264 standalone 4 CH sysyem. I set it up and all cameras are working. The problem is when I do a backup video to a usb flashdrive only two of the cameras will play the video, cameras 3 & 4. Cameras 1 & 2 come up with the message "media player cannot play this video". Why only 3 & 4 and not 1 & 2. Any help would be appreciated.

Yes all the cameras are the same. They came with the system, 4 cameras, DVR, HD hard drive and all the fittings etc.