# jl-dv-viewer: reconstructing Jieli-DV camera streaming

> jl-dv-viewer reconstructs the local streaming exchange of Jieli-DV-style Wi-Fi rearview and dash cameras in a Kotlin Android viewer. It sends length-prefixed CTP control messages over TCP, reassembles custom UDP chunks into MJPEG frames, and documents the command vocabulary and frame format. The app also offers crop, rotation and reconnection controls.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/marcodelpin/jl-dv-viewer>
- Primary source: <https://github.com/marcodelpin/jl-dv-viewer/blob/be39bb11e4ee141fd99e04b5dd99ff8ea4b4bfde/README.md>
- Catalog page: <https://awesomerea.org/resources/jl-dv-viewer-case/>
- Record JSON: <https://awesomerea.org/resources/jl-dv-viewer-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/jl-dv-viewer-case/index.md)

## Requirements & limits

- **Prerequisites:** A compatible Jieli-DV-style camera and an Android device connected to its Wi-Fi access point are required.
- **Limits:** The source states Android minSdk 21 and an arm64-only build; the camera IP is fixed at 192.168.1.1.
- **License:** MIT license.

## Primary sources

1. <https://github.com/marcodelpin/jl-dv-viewer/blob/be39bb11e4ee141fd99e04b5dd99ff8ea4b4bfde/README.md>
2. <https://github.com/marcodelpin/jl-dv-viewer/blob/be39bb11e4ee141fd99e04b5dd99ff8ea4b4bfde/docs/protocol.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.