NOSSDAV '02 Proceedings of the 12th international workshop on Network and operating systems support for digital audio and video
Dummynet and forward error correction
ATEC '98 Proceedings of the annual conference on USENIX Annual Technical Conference
Detailed analysis of Skype traffic
IEEE Transactions on Multimedia
Quantifying QoS requirements of network services: a cheat-proof framework
MMSys '11 Proceedings of the second annual ACM conference on Multimedia systems
Can Skype be used beyond video calling?
Proceedings of the 9th International Conference on Advances in Mobile Computing and Multimedia
Fair quality of experience (qoe) measurements related with networking technologies
WWIC'10 Proceedings of the 8th international conference on Wired/Wireless Internet Communications
Modeling the qoe of rate changes in SKYPE/SILK VoIP calls
Proceedings of the 20th ACM international conference on Multimedia
Video telephony for end-consumers: measurement study of Google+, iChat, and Skype
Proceedings of the 2012 ACM conference on Internet measurement conference
Quality of experience management for video streams: the case of Skype
Proceedings of the 10th International Conference on Advances in Mobile Computing & Multimedia
Survey on application-layer mechanisms for speech quality adaptation in VoIP
ACM Computing Surveys (CSUR)
Proceedings of the 4th ACM Multimedia Systems Conference
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The phenomenal growth of Skype in recent years has surpassed all expectations. Much of the application's success is attributed to its FEC mechanism, which adds redundancy to voice streams to sustain audio quality under network impairments. Adopting the quality of experience approach (i.e., measuring the mean opinion scores), we examine how much redundancy Skype adds to its voice streams and systematically explore the optimal level of redundancy for different network and codec settings. This study reveals that Skype's FEC mechanism, not so surprisingly, falls in the ballpark, but there is surprisingly a significant margin for improvement to ensure consistent user satisfaction.