Writing
3 posts
Post · Reflection
I Spent May 2026 Arguing With AI
Thirty days of AI-assisted vehicle forensics work — what got built, what broke, where one AI caught another being wrong, and what this kind of collaboration looks like in practice for a working consultancy. A reflection rather than a forensic write-up.
Post · Part 2
What happened in 1/36th of a second
An AI-assisted forensic walk-through. One minute, six cameras, 13,044 SEI records — and one missing from one CSV. How cross-camera comparison and binary decoding recover the missing record, and how a 17-frame back-camera offset was measured directly from the data.
Post · Part 1
Reverse-engineering Tesla SEI from one MP4
The first AI-assisted post in the series. A single front-camera MP4 traced from container structure to decoded telemetry — NAL units, the SEI marker, Tesla's protobuf payload, IEEE 754 floats and GPS doubles, decoded byte by byte.
Free Tools
3 available
Live
Tesla SEI Learning Tool
Step through the decode of a Tesla dashcam MP4 file at byte level. Covers NAL unit structure, SEI metadata, protobuf fields, IEEE 754 float encoding and GPS doubles. Interactive — click any byte to see the arithmetic.
Live
Tesla SEI Forensic Decoder
Load a Tesla dashcam MP4 and decode every SEI telemetry frame directly from the binary. Detects sequence gaps, flags anomalies, compares against SEI player CSV exports to identify omitted frames, and exports a forensic-grade CSV and provenance report.
Live
EDR Timeline Visualiser
Multi-channel pre-crash data on a shared time axis. Import a Bosch CDR CSV export or paste channel data from an EDR PDF, then play through from −5.0 seconds to impact. Read vertically at any moment to see the complete vehicle state. Time zero is the recording trigger — pre-crash data is negative time.
Module Tools
included with courses
Live
DAT — Data Analysis Tool
A professional multi-function tool for active vehicle forensics casework. Speed conversion, Unix epoch, GPS coordinates, SQLite database analysis, Vehicle Data Player and manufacturer reference — all in one place.
In Development
more coming
🔒 Module 2
CAN Bus Explainer
Animated visualisation of CAN bus communication. Frame structure, arbitration, ECU broadcasting and forensic significance of CAN data in collision investigations.
Coming Soon
Airbag & EDR Data
Understanding airbag control module data and event data recorders. What the EDR captures, how to read the pre-crash record and what the data can and cannot prove.
Part of The Vehicle Network ecosystem
Tools built by Harper Shaw Investigation Consultants Ltd. Full courses, modules and community via The Vehicle Network App.