Forensic video analysis software helps investigators review, enhance and interpret video evidence such as CCTV, DVR, body-worn and mobile footage so it can be used reliably in an investigation. It speeds up review, improves image clarity and surfaces the people, vehicles and events that matter, while keeping evidence secure and offline.
Semantics 21 builds this software for law enforcement and investigative teams as part of its wider set of digital forensics tools.
Video evidence now arrives from everywhere: CCTV and DVR systems, body-worn cameras, dashcams, doorbell cameras, mobile phones and social media. It comes in countless formats, is often hard to play without the right software, and can take hours to review by hand. Critical moments get missed, and poor-quality footage can be hard to make sense of.
S21 CCTV is built to fix that: an AI-powered platform for reviewing, analysing and enhancing digital video evidence, fully offline and without third-party plugins.
Grid-based navigation lets investigators scan footage at a glance and review CCTV up to 400 times faster than manual review.
AI-assisted detection surfaces the people, vehicles and objects that matter, so key moments are not missed.
Surface motion up to 110 times faster and detect audio events up to 430 times faster, with motion detection in user-defined regions.
Improve contrast, sharpness and lighting, and use facial upscaling to bring out critical detail in poor-quality footage.
ANPR and VRM detection reads number plates automatically, and OCR captures on-screen text.
Automatic face redaction and selective visibility make footage safe to share and disclose.
S21 CCTV has two modes. Frontline Mode gives fast, AI-free review with a simple set of controls, for officers who need answers quickly. Pro Mode unlocks the full AI toolset for deep forensic analysis in the lab. The same platform works for both, so evidence moves smoothly from the frontline to the forensic team.
Evidence stays in your environment, with nothing sent to the cloud.
Runs without additional hardware or third-party plugins.
Designed so any investigator can review video evidence, not just specialists.
AI surfaces the key moments so urgent investigations move faster.
Semantics 21 tools are used by specialist investigative teams worldwide, including British Transport Police, the Metropolitan Police, HM Revenue & Customs, the Royal Canadian Mounted Police and the U.S. Department of Defense.
See more in our case studies.
Forensic video analysis software helps investigators review, enhance and interpret video evidence so it can be used reliably in an investigation. S21 CCTV reviews, analyses and enhances CCTV and digital video, surfacing people, vehicles and events and improving image clarity.
It works with CCTV, DVR footage, body-worn cameras, dashcams, doorbell cameras, mobile video, DSLR footage and social media exports, without needing third-party plugins.
Yes. S21 CCTV runs fully offline with no additional hardware, so sensitive video evidence stays in your environment.
No. It is designed to be used by investigators without specialist forensic training. Frontline Mode offers fast, simple review, while Pro Mode adds the full AI toolset for forensic experts.
S21 CCTV reviews CCTV up to 400 times faster than manual review, detects audio events up to 430 times faster and surfaces motion up to 110 times faster.
Yes. It improves contrast, sharpness and lighting, and facial upscaling helps bring out critical detail in low-quality footage.
Yes. ANPR and VRM detection reads number plates, AI-assisted detection surfaces people and vehicles, and OCR captures on-screen text.
Yes. Automatic face redaction and selective visibility make footage safe to share and disclose.
