CCVSR .dat file can not be played directly, please use the export feature of CCVSR web GUI to export
the video file, the new video file format will be .vls, at the same destination path where .vls is generated.

You will find the CCVSR viewer utility (JavaVLS.1.0.0.xx) in the same destination path where .vls generated, then you can use this viewer to play the .vls video files.