caa a22 4500 605446784 CHVBK 20210128100129.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s11042-014-1920-7 doi (NATIONALLICENCE)springer-10.1007/s11042-014-1920-7 Quality evaluation of long duration AV content—an extended analysis using a novel assessment methodology [Elektronische Daten] [Adam Borowiak, Ulrich Reiter] This paper is an extension of our previous work describing a novel methodology for quality assessment of long duration audiovisual content. In this article we focus on data analysis of results obtained from two experiments conducted using the new methodology. In the first study, we found that the time dimension does not influence participants' expectations with respect to perceived video quality and that a possible increase or decrease in acceptable quality level is rather directly related to the presented material itself. Moreover, we found that participants are less sensitive to quality changes when the process is controlled externally than when they are in charge of the quality adjustment. A second experiment (study 2) was performed to evaluate the effect of simultaneous quality changes in the two modalities (audio and video) which confirmed the previous results. Springer Science+Business Media New York, 2014 Subjective audiovisual quality evaluation nationallicence Data analysis nationallicence Quality of experience (QoE) nationallicence Long duration assessment nationallicence Audio quality nationallicence Video quality nationallicence Borowiak Adam Norwegian University of Science and Technology (NTNU), Trondheim, Norge, Norway aut Reiter Ulrich Norwegian University of Science and Technology (NTNU), Trondheim, Norge, Norway aut Multimedia Tools and Applications Springer US; http://www.springer-ny.com 74/2(2015-01-01), 367-380 1380-7501 74:2<367 2015 74 11042 https://doi.org/10.1007/s11042-014-1920-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11042-014-1920-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Borowiak Adam Norwegian University of Science and Technology (NTNU), Trondheim, Norge, Norway aut NATIONALLICENCE 700 1- Reiter Ulrich Norwegian University of Science and Technology (NTNU), Trondheim, Norge, Norway aut NATIONALLICENCE 773 0- Multimedia Tools and Applications Springer US; http://www.springer-ny.com 74/2(2015-01-01), 367-380 1380-7501 74:2<367 2015 74 11042