Measuring perceived quality of speech and video in multimedia conferencing applications
MULTIMEDIA '98 Proceedings of the sixth ACM international conference on Multimedia
Specification, Mapping and Control for QoS Adaptation
Real-Time Systems
Cooperative QoS Management for Multimedia Applications
ICMCS '97 Proceedings of the 1997 International Conference on Multimedia Computing and Systems
A Novel Realistic Simulation Tool for Video Transmission over Wireless Network
SUTC '06 Proceedings of the IEEE International Conference on Sensor Networks, Ubiquitous, and Trustworthy Computing -Vol 1 (SUTC'06) - Volume 01
User perception of adapting video quality
International Journal of Human-Computer Studies
Hierarchical Parallelization of an H.264/AVC Video Encoder
PARELEC '06 Proceedings of the international symposium on Parallel Computing in Electrical Engineering
EURASIP Journal on Applied Signal Processing
Fine-grained scalable streaming from coarse-grained videos
Proceedings of the 18th international workshop on Network and operating systems support for digital audio and video
TCP-Friendly rate control scheme based on RTP
ICOIN'06 Proceedings of the 2006 international conference on Information Networking: advances in Data Communications and Wireless Networks
Media- and TCP-friendly congestion control for scalable video streams
IEEE Transactions on Multimedia
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The Internet has been experiencing a large growth of multimedia traffic of applications performing over an RTP stack implemented on top of UDP/IP. Since UDP does not offer a congestion control mechanism (unlike TCP), studies on the rate control schemes have been increasingly done. Usually, new proposals are evaluated, by simulation, in terms of criteria such as fairness towards competing TCP connections and packet losses. However, results related to other performance aspects--quality achieved, overhead introduced by the control, and actual throughput after stream adaptation--are difficult to obtain by simulation. In order to provide actual results about these criteria, we developed a comprehensive live video delivery tool for testing RTP-based controllers. In this version of the tool, the video is encoded on the fly in the MPEG-2 standard, but we intend to use the H.264/AVC standard as soon as common PC's provide enough processing power to encode H.264/AVC live video. The tool allows to easily incorporate new control schemes. In this paper, we describe the tool architecture and some implementation details. We also evaluate the performance of the tool itself, in terms of efficacy, accuracy, and efficiency.