Tools & Prototypes

Tools & Prototypes

Tools

VideoLat- Measuring delays in real-time communication

When using a videoconferencing system there will always be a delay from sender to receiver. Such delays affect human communication, and therefore knowing the delay is a major factor in judging the expected quality of experience of the conferencing system. Additionally, for implementors, tuning the system to reduce delay requires an ability to effectively and easily gather delay metrics on a potentially wide range of settings.

In order to support this process, we make available a system called videoLat. VideoLat provides an innovative approach to understand glass-to- glass video delays and speaker-to-microphone audio delays. VideoLat can be used as-is to do audio and video roundtrip delays of black box systems, but by making it available as open source we want to enable people to extend and modify it for different scenarios, such as measuring one-way delays or delay of camera switching.

Please, visit the VideoLat website to get more information and download it.

TV Speed

TV Speed is an Android application created by Wouter Kooij that measures relative playout delay compared to a reference provided by Gracenote. Currently it allows you to measure the playout delay for the channels BBC1, BBC2 and TV5.

More detailed explanation and instructions can be found here: TV Speed flyer

The app itself can be installed through the Playstore or can be found here: TV Speed

Prototypes

Synchronized Playback Across Devices + e2e delay measurements using GStreamer