Goal Set up a 2×2 video wall using the Raspberry Pi, connected to a projector via HDMI, and then project it onto the wall. The easiest path on a Pi is to let FFmpeg tile the 4 RTSP feeds, and pipe...

Background I was trying to set the Custom 1 protocol source path so I could play the camera video on my PC. By mistake, I changed the protocol from Hikvision to Custom 1 for the D1, D2, and D3 cam...

A practical guide to finding and nuking hidden watermarks in screenshots.

This deep-dive covers NAT, CGNAT, dynamic and shared public IPs, AWS jump boxes, BGP/IXP routing, TCP quirks, censorship, DNS/HTTPS privacy, and practical remote access hacks.

What is Reverse SSH It’s like instead of you SSH’ing into your home PC, your home PC SSHs out to a VPS you own. Then later, you use another device ssh to that VPS, and secretly slip back into your...

From Judit Polgár's chess rounds to kitchen multitasking, here's how to finally understand async IO, concurrency, threading, and multiprocessing in Python-with vivid analogies and cute code.

Check if a dict is a subset of another dict Option 1: Do all keys & values in crime_gene appear in p? if all(p.get(k) == v for k, v in crime_gene.items()): return True This checks: ...

🔗 Linked Lists To implement a sorted linked list of numbers, we have: int main(void) { // Memory for numbers node *list = NULL; // Build list for (int i = 0; i < 3; i++) {...

build a dual-script video extractor from raw .m3u8 or direct .ts links, with async download, DevTools tactics, and ts-to-mp4 merging. Plus: guide for using link_dl.py & m3u8_dl.py.

Walkthrough for cracking encrypted ZIP files using zip2john + Hashcat. Includes how to solve the dreaded 'No hashes loaded' error when dealing with multi-file archives. Battle-tested and beginner-f...