Coastline: An R&D Video Platform with Vector Search
An R&D video platform where you search by meaning, not by title: it finds the exact passage in a video and jumps to it.
About the project
An experimental video platform where I try modern approaches to searching inside video. You search by meaning, not by title: it finds exactly the passage where something is discussed, and the player jumps straight to it.
Under the hood is hybrid search (vectors and keywords), AI summaries, and transcripts with timestamps. So far on 26 videos from Hack Your Way 2025 and Digisemestr 2024.
An advanced project I'm still tuning before launch.
What you get
- You search by meaning, not by the video's title.
- Finds the exact passage and jumps the player to it.
- AI summaries so you know what a video is about.
How it works (under the hood)
- Vector search (pgvector + OpenAI embeddings).
- Hybrid search (RRF), transcripts with timestamps.
- A Mux player, 26 videos from HYW and Digisemestr.
Built with
Want to build like this too?
I teach building apps without programming in the AI First course.
More from App
Digisemestr Information System: CRM, Applications, and Alumni Portal
A large information system for the Digisemestr education program: CRM, applications, invoicing, online sales, and an alumni portal for 2,000+ graduates across ten cohorts.
Mokabu
A Q&A platform for events: a room in 60 seconds, anonymous questions, voting, moderation. Used at 100+ events.
Čekin.cz: Event Check-in System (Web + iOS)
A check-in system for events: web admin plus a native iOS app. Scans QR tickets, prints badges, ran all of Hack Your Way.