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Another person's gaze directed to oneself elicits autonomic arousal and facial reactions indicating positive affect in its observer. These effects have only been found to occur with mutual, live eye contact and not in response to direct gaze pictures or when the observer believes that the live person cannot see them. The question remains whether the physical presence of the other person is necessary...
This paper introduces an open-source HEVC video call application called Kvazzup. This academic proposal is the first HEVC-based end-to-end video call system with a user-friendly Graphical User Interface for call management. Kvazzup is built on the Qt framework and it makes use of four open-source tools: Kvazaar for HEVC encoding, OpenHEVC for HEVC decoding, Opus codec for audio coding, and Live555...
This paper proposes to use RTP (Real-time Transport Protocol) Reception Hint Tracks for convenient recording and playback of a video call in MP4 format. The feasibility of RTP Reception Hint Tracks is validated as a part of an implemented end-to-end video call system. The proposed approach records a bidirectional Linphone video call and multiplexes it as MP4 RTP Reception Hint Tracks with the L-SMASH...
In an attempt to evaluate the influence of the type of digital medium on language learner communication, this study examines negotiation of meaning during interaction between native speakers and non-native speakers of English in a task-based advanced second language classroom via two forms of real-time one-to-one computer-mediated communication: video calling and instant chat-messaging. It investigates...
Video calling is one of the widely used method of communicating. Encryption is applied to video call data to keep it secret. Real-time encryption is needed to support real-time communication such as video calling. Selective encryption is present as a solution to this problem. Skype is software that supports video calling. It cannot be ascertained whether Skype communication channel can be eavesdropped...
In this paper, we study Skype video call in LAN, WAN, and WiMAX. Our main interest is on traffic characteristics and user experience. Using the standard Foreman video sequence (320×240, 30fps, 8 second), we show that a Skype video call can adapt its source rate from < 5kBps up to ∼60kBps. The maximum achievable MOS (Mean Opinion Score) and EFR (Effective Frame Rate) is about 3.5 and 20 fps, respectively...
Mobile/wireless multimedia applications (e.g., video calls and IPTV) have gained great momentum in recent years. An important issue is to monitor/predict overall audiovisual quality, instead of audio-only or video-only quality, non-intrusively for technical or commercial reasons. Previous audiovisual modeling research mainly considered application parameters (e.g., codec and send bit rate). Little...
IP Multimedia Subsystem (IMS) is mostly regarded as the core architecture of the next generation network. And the mobile video call service based on IMS network is almost sure to be one of the most important applications beyond the 3rd generation mobile communication. This paper focuses on design and implementation of IMS video call based on Windows Mobile system and the open source eXosip package...
The telecommunication industry has seen a major transition over the last decade. There has been a steady shift from voice to video communication which includes video calls, television streaming and video on demand services. The introduction of Next Generation Networks has led to the convergence of fixed and mobile devices. These devices have different capabilities such as different screen sizes and...
Network designers face a challenging problem when trying to control the traffic entered into a wireless cellular network. The reason is the rapidly growing number of multimedia applications, combined with user mobility. Additionally, the existence of multiple cellular providers leads to strong competition among them. Providers need to use efficient resource management schemes in order to keep existing...
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