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CHARACTERIZING VOICE AND VIDEO TRAFFIC BEHAVIOR OVER THE INTERNET

PRASAD CALYAM, CHANG-GUN LEE
2005 New Trends in Computer Networks  
In this paper, we present our research on characterizing voice and video traffic behavior in large-scale Internet Videoconferencing systems.  ...  by the variations of delay, jitter, lost and reordered packets in the network, on the end-user perception of audiovisual quality.  ...  It is evident that network jitter has a higher impact on the audio packet loss compared to the impact of network delay or loss.  ... 
doi:10.1142/9781860947308_0009 fatcat:mw3fqpmlifce3feuyfaazvacvy

The process model of subjective quality assessment of videoconferencing in enterprise

Jana Filanová, D. Hrušovská, M. Kmety Barteková, M. Kozáková
2020 SHS Web of Conferences  
The process of quality assessment can help IT management to decide on the use of videoconferencing as a means of communication in business.  ...  Videoconferencing is one of the most appropriate ways to transmit information online to participants not only during quarantine.  ...  The paper was elaborated within VEGA No. 1/0388/20 IT Management in Enterprises in Slovakia: International Standards and Norms Versus Individual Business Processes -proportion 100 %.  ... 
doi:10.1051/shsconf/20208301015 fatcat:fjeds6xycfduhfdranqdlihqxm

Performance Measurement and Analysis of H.323 Traffic [chapter]

Prasad Calyam, Mukundan Sridharan, Weiping Mandrawa, Paul Schopis
2004 Lecture Notes in Computer Science  
assessment of various audio and video streams.  ...  The popularity of H.323 applications has been demonstrated by the billions of minutes of audio and video traffic seen on the Internet every month.  ...  We use these bounds to determine the impact of network health on end-user perception of audiovisual quality of H.323 applications.  ... 
doi:10.1007/978-3-540-24668-8_14 fatcat:b5pqytvmtza6rbtm3aqdkuhjo4

Quality Evaluation of Audio and Video Signals in Videoconferences

Jana Filanová, Iveta Ondrášová, Anikó Töröková
2020 Acta Polytechnica Hungarica  
Our test aimed to compare subjective methods of video quality evaluation with objective methods and to evaluate the impact of audio quality on the overall video sequence quality.  ...  In general, occasional image disturbance has less impact on the perception of quality in comparison to the disturbances in an audio track.  ...  One example is the subjective assessment of the quality of video in an audio-visual communications system (such as television or videoconferencing) [6] .  ... 
doi:10.12700/aph.17.7.2020.7.5 fatcat:wrvrndbuwbhrjfz6p3br6n2tv4

Video-mediated communication in hospice interdisciplinary team meetings: examining technical quality and content

George Demiris, Debra Parker Oliver, Elaine Wittenberg-Lyles, Karla Washington
2009 AMIA Annual Symposium Proceedings  
We assessed their audio and video quality using both a form that was filled out on site and a protocol for retrospective analysis.  ...  This study aims to determine how videoconferencing quality impacts the style and content of communication between members of hospice interdisciplinary teams and patients and their families.  ...  ACKNOWLEDGMENT This project was funded by the NIH National Cancer Institute, grant R21CA120179 Patient and Family Participation in Hospice Interdisciplinary Teams (Parker Oliver, PI).  ... 
pmid:20351836 pmcid:PMC2815404 fatcat:od5ql3tgpzfl7nyb4xrdbqmjve

Impact of Different Quality of Service Mechanisms on Students' Quality of Experience in Videoconferencing Learning Environment

Toni MALINOVSKI, Vladimir TRAJKOVIK, Tatjana VASILEVA-STOJANOVSKA
2018 The Turkish Online Journal of Distance Education  
Hence, this study evaluates the impact of different Quality of Service mechanisms utilized in the infrastructure on students' Quality of Experience in videoconferencing learning environments.  ...  Finally, application controls had greater impact on perceived students' Quality of Experience than the network ones, which correlated to performance behavior of the infrastructure.  ...  Hence, they target the quality of delivered content via the utilized application, such as audio/video synchronization, terminal handling of media flows, video error concealment, etc.  ... 
doi:10.17718/tojde.444614 fatcat:n577lsd7wbah3mifvdkgy4uj7u

The Performance of Two-Dimensional Media Scaling for Internet Videoconferencing**Supported by grants from the IBM and Intel Corporations, the National Science Foundation (grants IRIS-9508514 & CCR-9510156), and the Advanced Research Projects Agency (grant number 96-06580) [chapter]

Peter Nee, Kevin Jeffay, Gunner Danneels
2002 Readings in Multimedia Computing and Networking  
Here we report on our experiences with a novel media-scaling congestion control scheme that was implemented in an experimental version of the Intel ProShare TM videoconferencing system and tested over  ...  interactive multimedia application on the Internet.  ...  Acknowledgments We are indebted to Jorg Liebeherr at the University of Virginia for the remote use of his facilities to perform the experiments reported herein.  ... 
doi:10.1016/b978-155860651-7/50137-6 fatcat:afrlmgyx7jfcnpjmb3gsthnqqi

Conditions of Use, Reliability, and Quality of Audio/Video-Mediated Communications During In-Home Rehabilitation Teletreatment for Postknee Arthroplasty

Patrick Boissy, Michel Tousignant, Helene Moffet, Sylvie Nadeau, Simon Brière, Chantal Mérette, Hélène Corriveau, François Marquis, François Cabana, Pierre Ranger, Étienne L. Belzile, Ronald Dimentberg
2016 Telemedicine journal and e-health  
Physical therapists assessed the quality and impact of video-mediated communications after each TELE session on seven attributes.  ...  following total knee arthroplasty (TKA) and (2) assess from the perspective of the providers, the quality attributes of the technology used and its impact on clinical objectives.  ...  Funding from the Canadian Institutes of Health Research (CIHR) supported this research. P.B. was supported by a Fonds Recherche Qué bec-Santé (FRQ-S) research scholar award.  ... 
doi:10.1089/tmj.2015.0157 pmid:26958932 fatcat:2t4rbywv6vh2dpxn3p26p3vbxa

Preparing for Plastic Surgery Residency Interviews in a Virtual Era

Riley A Dean, Ashraf A Patel, Abra H Shen, L Patton Griffith, Samuel H Lance
2020 Plastic and Reconstructive Surgery, Global Open  
After the setup is complete, ensure optimal audio and video quality by conducting a trial run using the software with another party to assess clarity.  ...  Consider purchasing a lapel microphone, external webcam, or specific video lighting sources to improve audio and video quality.  ...  DISCLOSURE The authors have no financial interest to declare in relation to the content of this article. ACKNOWLEDGMENTS We thank Drs.  ... 
doi:10.1097/gox.0000000000003178 pmid:33173690 pmcid:PMC7647492 fatcat:377expwudbeahbonhtu5ovuzpy

Subjective evaluation of a 3D videoconferencing system

Hadi Rizek, Kjell Brunnström, Kun Wang, Börje Andrén, Mathias Johanson, Andrew J. Woods, Nicolas S. Holliman, Gregg E. Favalora
2014 Stereoscopic Displays and Applications XXV  
Whereas methods for subjective evaluation of traditional 2D videoconferencing systems are well established, the introduction of 3D requires an extension of the test procedures to assess the quality of  ...  In this paper, we present a subjective evaluation of a prototype multiview autostereoscopic video conferencing system and suggest a number of possible improvements based on the results.  ...  Ambient Room and Equipment Characteristics A list of parameters is provided in Recommendation P.920 [3] for typical viewing and listening conditions that are used in audio-visual quality assessment.  ... 
doi:10.1117/12.2037795 fatcat:tur6ptq2hfbtfmzdyrn2sd5j4y

Performance Measurement Methodologies and Quality of Service Evaluation in VoIP and Desktop Videoconferencing Networks [chapter]

Henri Tobiet, Pascal Lorenz
2000 Lecture Notes in Computer Science  
The present paper relates to performance and quality of service evaluation for VoIP (Voice over IP) and desktop videoconferencing services in IP networks.  ...  Work is currently on-going in modelization of the TCP/IP protocol layer, in terms of performance aspects (delays, etc...). The resulting model will then be applied to  ...  The end-to-end audio/video quality depends on input and output devices, analogue/digital and digital/analogue circuit noise, video and audio coding distortion, effects of bandwidth limitation in the IP  ... 
doi:10.1007/3-540-45494-2_8 fatcat:m4o6fgfp5ndarhgwfjpjbnbiiu

Remote imaging via FaceTime for potential long-distance diagnosis of suspected cardiac structural and shunt anomalies on contrast echocardiography (The RIFLE Study)

Jose Donato A. Magno, Romeo J. Santos, Edwin S. Tucay, Vianelly Berwyn F. Flores, Ronald E. Cuyco
2014 ASEAN Heart Journal  
Video and audio quality were evaluated using a subjective scoring scale, while internet connection was assessed in terms of lag time to transmission (milliseconds), as well as download and upload speeds  ...  Moreover, FaceTime was feasible, generating acceptable internet speeds as well as obtaining high audio and video quality scores at both ends of the transaction.  ...  Acknowledgment The investigators of this study recognize the invaluable contribution of the following people in making the study possible: from the Non-invasive Cardiology Division  ... 
doi:10.7603/s40602-014-0014-0 fatcat:iwukiudpsbd4bn3c2ueofe2o4a

Towards Individual QoE for Multiparty Videoconferencing

Marwin Schmitt, Judith Redi, Dick Bulterman, Pablo S. Cesar
2018 IEEE transactions on multimedia  
In this paper, we focus on the impact video quality has on conversations that revolve around objects that are presented over the video channel.  ...  Index Terms-Multi-Party video conferencing, Quality of Experience, Over-the-top, subjective quality, quality metrics, user study  ...  Impact of system factors on videoconferencing QoE and interaction Video quality for video conferencing is usually assessed with subjective tests (passive or active) based on which objective video quality  ... 
doi:10.1109/tmm.2017.2777466 fatcat:ipiywabo6jgn7bsonyqgc7gayi

Mobile Videoconferencing Apps for Telemedicine

Kai Zhang, Wei-Li Liu, Craig Locatis, Michael Ackerman
2016 Telemedicine journal and e-health  
The quality and performance of several videoconferencing applications (apps) tested on iOS (Apple, Cupertino, CA) and AndroidÔ (Google, Mountain View, CA) mobile platforms using Wi-Fi (802.11), third-generation  ...  The platform, network, and apps interact, and it is impossible to discuss videoconferencing experienced on mobile devices in relation to one of these factors without referencing the others.  ...  Acknowledgments The research reported was supported by the Intramural Research Program of the National Institutes of Health and the National Library of Medicine.  ... 
doi:10.1089/tmj.2015.0027 pmid:26204322 pmcid:PMC4739126 fatcat:7ebxffwpxne4tjyzzs2r7ldl4u

Assessing disordered speech and voice in Parkinson's disease: a telerehabilitation application

Gabriella Constantinescu, Deborah Theodoros, Trevor Russell, Elizabeth Ward, Stephen Wilson, Richard Wootton
2010 International journal of language and communication disorders  
The telerehabilitation application described in this study provides evidence for the delivery of online assessment for the dysarthric speech disorder associated with Parkinson's disease.  ...  Online assessments were conducted via a personal computer-based videoconferencing system with store-and-forward capabilities, operating on a 128 kbit/s Internet connection.  ...  The research forms part of the doctoral thesis of Gabriella Constantinescu at The University of Queensland, Australia.  ... 
doi:10.3109/13682820903470569 pmid:20102257 fatcat:h2d3nw6qjzh3hm4zkthfe5xudi
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