Demultiplexing Video: Analog to Digital Format

First of all, what is demultiplexing video? Video is often recorded in a multiplexed format when multiple camera angles are recorded from CCTV to VHS cassette tape. This format rapidly alternates as it plays in linear fashion from the tape. Camera angles must then be independently examined for forensic video analysis. The demultiplexing process selects the best frame from each camera view and divides them into their own independent feeds or video clips for examination.


While demultiplexing equipment is available for public purchase, it can prove difficult to operate and compatibility issues often arise. One advantage to using professional demultiplexing services, such as those offered by Video Forensic Expert, is that we can quickly and easily generate demultiplexed video feeds and create digital video files for analysis and courtroom use.

Digital Demultiplexing Process

Video Forensic Expert uses dPlex® Pro from Ocean Systems to digitally demultiplex VHS cassette tapes and other types of analog footage used as video evidence. This application is both expensive and time-consuming, which is why we offer it as an advanced recovery service. It is also important to note that a qualified forensics technican or expert MUST perform the invesitgation in order for it to be considered accurate in litigation or a court of law.


The demultiplexing video investigation requires a playable VHS tape with sufficient quality. Should the tape fail to play back smoothly or picture quality is mediocre, the investigation could be unsuccessfully. Tools need to accurately identify all camera angles in order to sift through independent video streams. We utilize VHS playback decks with sophisticated tracking functions that align tape film against the playback head, providing the best quality playback to capture from. Below are examples of quality differences between correctly and incorrectly tracked VHS tapes. Contact the Video Forensic Expert team for further information on the demultiplexing services we provide.


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