Delays in Broadcast Networks by Anders Cedronius from Net Insight
Is it possible to harmonize or beat live broadcast network delay today with streaming? A presentation by Anders Cedronius on Streaming Tech Sweden on Nov 22, 2017.
• Long & Variable delay (Cheering neighbor problem) • Social interaction is broken due to the varying delays • No or poor interactivity (chat, voting) • Limits extended screen services 2 | Net Insight AB Live internet streaming Compared to Live Broadcast
Camera 20-40 ms • OB-Encoder 500-2000 ms • One satellite-hop 250ms • Decoder 200 ms • Total -> about 2 seconds • Camera 20-40 ms • OB-Encoder 50 ms • Network 20ms • Decoder 50 ms • Total -> about 160 ms
available • DVB-C (Digital cable) • DVB-S (Digital satellite) • DVB-T (Digital terrestrial) • IPTV • (let’s skip all analog methods) • In this case let’s focus on DVB-T
The inter-delay difference is approximately 5 seconds (static) • Very very small time variations within a single transport technology (miliseconds). End user A End user B End user C
The inter-delay difference is seconds to minutes (variable) • Very very large time variations within a single transport technology (seconds to minutes) End user A End user B End user C
TV-Production Streaming encoding Internet peering Internet Cloud / datacenter In Europe somewhere x2 for redundancy Additional cameras In car cameras (8) + extra content (1) Piggy back production feed Clients
delay CBR 1.5 Seconds • Transport delay from encoded data stream until client display 3000 ms +- single digit ms • Total fixed delay glass to glass 4.5 seconds
to harmonize or beat live broadcast networks delay today. • We have to stop talking about delay at streaming start as the only parameter. Delay stability over time is a must if you want to enable voting / betting / social interaction.