This document discusses ORTC SimulCast and how it differs from WebRTC 1.0. It explains that ORTC is WebRTC 1.0 plus SimulCast and multi-stream interoperability. It then defines SimulCast and describes AVC and SVC SimulCast approaches. It provides details on SVC including base layers, enhancement layers, parameters like temporal, spatial and quality layers. The document also outlines the changes in
![ORTC SVC SimulCast](https://cdn-ak-scissors.b.st-hatena.com/image/square/55c7625f9741240cb4d66c81a3d498ea7335adbb/height=288;version=1;width=512/https%3A%2F%2Fcdn.slidesharecdn.com%2Fss_thumbnails%2Fortcsimulcast-150927115855-lva1-app6891-thumbnail.jpg%3Fwidth%3D640%26height%3D640%26fit%3Dbounds)