How to adapt: SVC-based quality adaptation for hybrid peercasting systems

Abstract

Live streaming of large-scale events such as the Olympic Games with a huge number of viewers is challenging, as the streaming infrastructure needs to scale fast and big, and often in an unpredictable manner. Peer-to-peer (P2P) live streaming (Peercasting) has proven to be beneficial in these scenarios, as resources are scaling inherently with the number of nodes. However, churn behavior in a node's neighborhood may result in fluctuating downstream bandwidth and thus freezing (stalling) playback. Related work tries to mitigate this effect by using layered video codecs, focusing on single-dimensional scalability in mesh-pull based systems. Yet, the benefits of multidimensional scalability (resolution, frame rate, and quantization) combined with coexisting pull-/push mechanisms introduced by modern hybrid P2P streaming architectures have not been studied in detail. Consequently, this work proposes a new scheduling algorithm taking these aspects into account. The evaluation shows large benefits for end-users by reducing the frequency of stalls by 90% even under extreme conditions.

UW-SVC: Scalable Video Coding Transmission for In-Network Underwater Imagery Analysis

“…A method for adapting the number of layers based on a fixed time allotment is proposed in [15], This link-level method does not explore a multicast scenario. The authors in [16] explore dynamic layer adjustment in a content-delivery context where a directdownload system is paired with peer-to-peer. This sharing is top-down content delivery, rather than a scheme for in-group video sharing where each consumer is also a producer.…”