Interactive vs. non-interactive subjective evaluation of IP network impairments on audiovisual quality in videoconferencing context

Abstract

International audienceIn this paper, we present a subjective audiovisual quality assessment experiment realized using a PC based video-conferencing application connected via a local IP network. The experiment was conducted under two different scenarios: a non-interactive and an interactive conversational one. We present the effects of network impairments (packet loss, delay) on perceived audiovisual, audio and video quality. We evaluate the impact of scene complexity on the quality perception in case of video calls. We establish a comparison between the perception of multimedia quality in interactive and non-interactive context. The results presented in this paper show a dependency between the perceived quality and the scene complexity: the perceived quality of a high spatial and temporal complex scene is inferior to that of the less complex one. In addition, our findings show that the audio-video synchronization acceptability do not differ between the interactive and the non-interactive experimental context. © 2016 IEEE

The contrast effect: QoE of mixed video-qualities at the same time

“…This is in line with the finding that the participant who plays a central role in small group discussion notices delay stronger than less involved participants [55]. Studies investigating the audio and video quality in video-conferencing assessed the QoE for different encoding qualities [39], packet loss [12,27,50], resolution [10] and frame-rate [27]. In the area of multi-party video-conferencing one study investigated different bitrates and packet losses [52] and found that encoding each stream with 4mbps did not yield a significant improvement to encoding each stream with 1mbps.…”