/en/ninja-slideshow
Case · Open source
A digital signage system with real-time content management that loops images and videos on browsers, Raspberry Pi, Android TV and LG and Samsung smart TVs.
01 / NINJA Slideshow
Multiple screens from different brands and platforms, spread across different areas, all need to show the same up-to-date content without anyone loading it onto each one by hand. And because the screens stay on unattended, any memory, network or deployment failure ends in a black screen.
02 / NINJA Slideshow
A digital slideshow system with an admin panel: upload images and videos, reorder them with drag and drop, and every screen plays them in an endless loop. Each change reaches every client instantly through Socket.IO.
It runs in any modern browser, on Raspberry Pi (Chromium in kiosk mode), on Android TV and Google TV (a Flutter app), on LG (a webOS app) and on Samsung (a Tizen app).
03 / NINJA Slideshow
Files go straight from the browser to DigitalOcean Spaces using presigned URLs; files of 100 MB or more are uploaded in parallel parts, up to 2 GB, with a progress bar and a cancel option. The server never holds the file in memory.
After every upload, deletion or reorder, the server notifies all clients and they refresh their lists.
Scripts that discover screens on the network, install the latest version on all of them (LG, Samsung and Android TV, each with its own tooling), power them on via Wake-on-LAN and shut them down at the end of the day, scheduled with cron. A deployment is only reported as successful if the install actually went through.
04 / NINJA Slideshow
05 / NINJA Slideshow
The repository documents how real failures on Android TV were diagnosed and fixed: a memory leak during video playback, half-finished cache downloads that cut videos short, and a screen that turned itself off every 10 minutes. Each fix shipped in a client release.
06 / NINJA Slideshow
| Component | Technology |
|---|---|
| Backend | Express and Socket.IO, in TypeScript |
| Web panel | React, Vite, Tailwind and shadcn |
| Storage | DigitalOcean Spaces (S3-compatible) |
| Raspberry Pi and Android TV client | Flutter |
| LG and Samsung clients | Web apps for webOS and Tizen |
07 / NINJA Slideshow
Public code on GitHub: MoscoDJ/NINJA-Slideshow.
08 / NINJA Slideshow
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