In addition, videotape evidence is demonstrative evidence or evidence that can convey a relevant first-hand sense impression to the viewer. This evidence also must be authenticated or verified and shown to be a genuine, fair and accurate portrayal of what it is purported to reveal. Generally the prevailing trend in case law today is clearly in favor of admissibility. The basic recording process of video information proceeds initially from the capture of light and sound waves to the generation of electrical impulses and later to magnetically stored electrical impulses on the videotape and then, following the playback sequence, converts the signals from the magnetic tape into electrical signals that are capable of producing video and audio output. Most videotape involves a plastic tape coated material with magnetic particles such as iron oxide and other reproduction characteristics.
Many camcorders also allow for recording of specific time and date information.
Conventional post-production or out of camera videotape editing consists of imposing order of a sequence of scenes previously recorded. Traditional editing of videotape through cutting or splicing is rarely done as the effects are readily discernible by the viewer. Distortions resulting from varying playback speeds are very difficult to achieve with either conventional or digital video editing. It should be noted that the editing or alteration of the audio competent of videotape evidence should be considered separately from the video component. The audio component may be re-recorded onto an edit master.