Look Ahead: A DASH Adaptation Algorithm
June 1, 2018·
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0 min read
Román Belda
Ismael de Fez
Pau Arce
Juan Carlos Guerri
Abstract
This paper proposes a video quality adaptation algorithm based on the Dynamic Adaptive Streaming over HTTP (DASH) standard for on-demand video services. When a video is encoded with constant quality, the resulting bitstream has variable bitrate due to the inherent nature of the video encoding process. The proposed algorithm, called Look Ahead, takes into account this bitrate variability in order to calculate, on the fly, the appropriate quality level that minimizes the number of interruptions during the playback. Moreover, the Look Ahead algorithm has been implemented and integrated into ExoPlayer v2, the latest version of the library developed by Google to play DASH contents. The proposed algorithm is compared to the Müller and Segment Aware Rate Adaptation (SARA) algorithms as well as to the adaptive algorithm integrated into ExoPlayer. The comparison reflects that Look Ahead outperforms the Müller, SARA and the ExoPlayer adaptive algorithms in terms of number and duration of video playback stalls, with hardly decreasing the average video quality.
Type
Publication
2018 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, 1–5. IEEE
Authors
Assistant Professor
Román Belda received his degree in Computer Science in 2004 and an M.S. in Telematics in 2013 from the Universitat Politècnica de València (UPV), Spain. He obtained his Ph.D. in Telecommunications from UPV in 2021. He is currently an Associate Professor at the Universitat Politècnica de València and a member of the Institute of Telecommunications and Multimedia Applications (iTEAM). His research interests include adaptive video streaming (MPEG-DASH), low-latency and peer-assisted video delivery, Quality of Experience (QoE), mobile applications and multimedia transmission protocols.
Authors
Associate Researcher · Master’s Director at VIU
Ismael de Fez was born in Valencia, Spain in 1983. He received his Telecommunications Engineering degree in 2007 and his M.S. in Telematics in 2010 from the Universitat Politècnica de València (UPV), where his M.Sc. thesis was awarded by the Telefónica chair of UPV. He obtained his PhD in Telecommunications from UPV in 2014 and an MBA from UPV in 2017. He worked as an R&D Engineer at the Institute of Telecommunications and Multimedia Applications (iTEAM, UPV) from 2008 to 2021. Since 2021 he has been Director of the Master’s in Development of Web Applications and Services at the Valencian International University (VIU). His research interests include multimedia transmission, DASH adaptive streaming, QoE modelling, AL-FEC coding for unidirectional wireless environments, and file encoding.
Authors
Associate Professor
Pau Arce Vila received his Telecommunications Engineering degree in 2005, his M.S. in Communication Technologies, Systems and Networks in 2008, and his PhD in Telecommunications in 2014, all from the Universitat Politècnica de València (UPV), Spain. He is a Profesor Permanente Laboral in the Communications Department at UPV and a researcher at the Institute of Telecommunications and Multimedia Applications (iTEAM) since 2005. His research interests include multimedia QoS, adaptive video streaming (DASH), quality of experience, routing in wireless ad hoc networks, and performance evaluation of multimedia systems.
Authors
Full Professor · Head of the group
Juan Carlos Guerri Cebollada was born in Valencia, Spain in 1969. He received his M.S. and Ph.D. degrees in Telecommunication Engineering from the Universitat Politècnica de València (UPV) in 1993 and 1997, respectively. He is a Full Professor in the Department of Communications Engineering at UPV, where he teaches at the ETSI Telecomunicación. He leads the Multimedia Communications research group (COMM) of the iTEAM (Institute of Telecommunications and Multimedia Applications). His research spans multimedia communications, adaptive video streaming (DASH), quality of experience, wireless and ad hoc networks, and the application of multimedia technologies to industry, medicine, education and communications.