Method and device for exchanging data between a web application and an associated web engine

摘要

Parsing (de-encapsulating) by a web engine 440 initialization data and initializing video components, wherein encoded video data is organized into a plurality of video components and at least one video component is able to be simultaneously displayed with another video component; obtaining, by the web engine from the initialisation data, information about the ability for each video component to be simultaneously selected with another video component; signalling this information to a web application 400; the web application selecting part of the video components based on the information and indicating to the web engine the video component to be decoded. The method may allow a web browser to control the decoding of a region of interest (ROI) or a virtual reality stream based on multiple video tracks. Categories may be determined for the video components, indicating whether they require other video components to be decoded.