Adaptation of Audiovisual Contents and Their Delivery Means

The article examines the existing video streaming techniques and compares the HTTP-based techniques with other techniques. Today there are several streaming methods to deliver audiovisual content, including: HTTP streaming, Real Time Streaming Protocol (RTSP, developed by IETF), Microsoft Media Services (MMS), and Real Time Messaging Protocol (RTMP) for Adobe Systems. 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.