We then report on the results of five user studies conducted over the course of the past 4 years, focused on investigating the impact of video quality in terms of different video encoding parameter configurations (namely bitrate, frame rate, and resolution) on subjective QoE scores for WebRTC-based video calls. In this paper, we first provide an overview of multiparty audiovisual calls established via mobile devices and key aspects influencing Quality of Experience (QoE). Multiparty audiovisual telemeetings are an example of a real-time, delay sensitive, and heavy load service, demanding to run on smartphones that are limited in display size, processing power, and battery capacity. The expectations of modern mobile users are increasingly moving towards being able to access demanding services regardless of context or system influence factors, such as network conditions, service topology, and device processing capabilities. One of the interesting findings we unraveled is that user Quality of Experience for video conferencing service varies depending on their role in the meeting. There are three main result categories which we discussed in the paper: a) characteristics of a user environment from where the conferences are most often accessed, b) description of a typical online meeting use-case scenario, and c) user perception about different quality degradations which may occur during the meeting. This paper brings the first results of a survey conducted on a sample of 541 respondents. Encouraged by such a situation, we became curious and motivated to explore user experiences and practices when using these online meeting platforms. This migration has led to a globally significant increase in the number of users of video conferencing applications and, thus, a significant increase in the share of video traffic in total Internet traffic. During the COVID-19 crisis in 2020, most of the usual activities, such as attending business meetings, classes at schools, and universities, as well as social gatherings with friends, colleagues, and family, took place on various online platforms.

Teams vs skype vs zoom