https://luispa.com/en/tags/rtsp/Recent content in Rtsp on Technical NotesHugoen-USSat, 05 Sep 2026 00:00:00 +0000https://luispa.com/en/posts/2026-09-05-movistar-bajo-demanda/Sat, 05 Sep 2026 00:00:00 +0000https://luispa.com/en/posts/2026-09-05-movistar-bajo-demanda/<img src="https://luispa.com/img/posts/logo-linux-rtsp.svg" alt="Linux router logo" width="150px" height="150px" style="float:left; padding-right:25px" /> <p>Regular Movistar TV channels travel over <strong>Multicast/UDP</strong>, but everything you ask for yourself (a movie from the video store, rewinding what is currently on, a cloud recording) travels over <strong>Unicast</strong>, and that is where a home-made Linux router chokes. In this post I explain how that traffic works <strong>today</strong>, measured with the TV switched on, and what you need to put on the router to make it play. There is a surprise: not everything uses <code>RTSP</code> anymore.</p> <p>More than a decade ago I wrote <a href="https://luispa.com/en/posts/2014-10-18-movistar-bajo-demanda/">Video on Demand for Movistar</a>, the first time I wrestled with this on my <a href="https://luispa.com/en/posts/2014-10-05-router-linux/">Linux router</a>. Recently I felt like checking whether <code>igmpproxy</code> and the kernel <code>RTSP</code> helper were still needed, I took another look at the whole thing, and this post is the result. Yes, I was bored and decided to do an academic study.</p> <br clear="left"/>