Playback delay and buffering optimization in scalable video broadcasting

Abstract

Abstract-This paper addresses the problem of optimizing the playback delay experienced by a population of heterogeneous clients, in video streaming applications. We consider a typical broadcast scenario, where clients subscribe to different portions of a scalable video stream, depending on their capabilities. Clients share common network resources, whose limited rate directly drives the playback delays imposed to the different groups of receivers. We derive an optimization problem, that targets a fair distribution of the playback delays among heterogeneous clients, as well as minimal buffer usage. A server-based scheduling strategy is then proposed, that takes into account the properties of the targeted clients, the channel status, and the structure of the media encoding. A polynomial-time algorithm providing close to optimal results is introduced and it is shown to offer significantly reduced playback delays per client population, as compared to traditional scheduling strategies. In the same time, PSNR performance is not affected, which altogether leads to an overall improvement of the quality of service.

A Web Synchronization Method for Browser-Based Communications

“…Many researchers have studied methods for synchronization regarding the output times of streaming content such as voice and video [4], [5], [6], [7], [8], [9]. These methods delay the output times of each data packet to ensure the output intervals of the same kinds of media (voice or video) data are equal to the generation intervals of the same data.…”

“…These methods [4], [5], [6], [7], [8], [9] also achieve an intermedia synchronization that synchronizes the output times between different kinds of streaming data such as voice and video.…”

“…Previous methods [1], [2], [3], [4], [5], [6], [7], [8], [9] described above do not focus on the sharing of browser operations among conversational partners. Moreover, methods [4], [5], [6], [7], [8], [9] synchronize the output time of streaming content, but methods [1], [2], [3], [4], [5], [6], [7], [8], [9] cannot synchronize non-streaming content such as web contents.…”

“…In order to prevent the out-of-synchronization problem, several methods have been studied [4], [5], [6], [7], [8], [9]. These studies synchronize the actual output time of the voice and video data among devices and ensure the quality of the real-time communication.…”

“…In addition to this issue, previous methods [1], [2], [3], [4], [5], [6], [7], [8], [9] do not focus on the sharing of browser operations among conversational partners.…”