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Adaptation of Audiovisual Contents and Their Delivery Means


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With the advent of technology characterized by heterogeneity and the increasing offers of services and applications, a user's Quality of Experience (QoE) has become a crucial factor for the success or failure of new applications and services. Content adaptation is the process of selecting, generating, or modifying content to suit the user's preferences, consumption style, computing and communications environment, and usage context. This can be applied within media types, such as reducing image size or resolution, and across media types, like converting video from one codec to another. Content adaptation can be implemented through three general approaches: Client-side approach (user); server-side approach (media source); or, intermediate-proxy approach between the client and the server.10

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The client-based approach is performed by the client's device, therefore providers can create one version of content and the same content can always be displayed on different devices. The terminal selects the content, which is matching the most of its capacities and the available bandwidth. Examples are Scalable Video Coding (SVC), where the delivered content is coded in different versions in the form of different layers and the client terminal selects the layers that best match the terminal capacity and network status; and HTTP Adaptive Streaming (HAS), where content is coded considering different quality levels and the terminal requests the best matching content based on device capacity and available bandwidth.


 

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