This file contains the video and audio as recorded by the VIDEO4, this is by far the largest file that is stored on the flash card.

This contains the times of the start of chapters in the video files. If this file is lost, the user will not be able to jump to special locations in the video. However user is still able to continue with other functions.

This file contains information(pointers) to where each frame starts, for example frame 21556 starts at 8716231 bytes. This "pre-indexing" of frames allows the video file to be loaded almost instantly into the PC. If this file is missing for any reason, then loading takes from a few seconds to a few minutes depending on the length of the video file. This information is then cached in the PC temporary directory, so next time loading is instant.

This file contains normal "data" for example GPS and accelemeter information, as well as any temperatures, pressures etc that were logged. This file is exactly the same format as if it had been logged using one of our other conventional "non video" loggers. This data file can be used without the video file if required.

LAP files contain LAP marker information with respect to an origin. Once the VIDEO4 receive a GPS Lock it will match with origin of all existing LAP files on the Removable Compact Flash card. If a matching file is found, the Laps markers are added according to the file. If there isn’t any matching Lap marker file on the CF card, the VIDEO4 unit will save a Lap file based on the origin location with Lap markers added while recording.