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Implementing SVC in WebRTC

June 3, 2014 | Telepresence Options

one-on-one videoconferencingE

Story and images by Stass Soldatov / TrueConf

A new technical approach can provide large-scale group WebRTC video conferencing despite WebRTC's lack of native support for Scalable Video Coding.

One of the main issues with WebRTC is the lack of Scalable Video Coding (SVC) support for group video conferences. The WebRTC standard does not include SVC, and without it, a session with multiple participants--especially on a mobile platform--requires recoding for the same conference in different formats. This massively reduces the capacity of a WebRTC server.

Let's look at the problems group video conferencing faces in real Internet situations, along with the possible solutions for these problems.

One-on-One Conferencing Structure and the Challenges of Group Video Conferences

The optimal way to achieve one-on-one video communication is to directly connect two clients. The clients just need to agree on the maximum possible channel capacity. For example, if one user has a 300 kbps channel and another has a 200 kbps channel, they need to choose the minimum speed--200 kbps. This way, each user will send and receive 200 kbps for the duration of the call and they will have no problems.

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