# Perceptual Quality of Audio-Visual Content with Common Video and Audio Degradations
## 3 Motivation
\begin{table}
\begin{tabular}{l l l l l l l l l l l l l} \hline \hline \multicolumn{3}{c}{**DataSet**} & \multicolumn{6}{c}{**Test Material**} & \multicolumn{6}{c}{**Subjective Experiment**} \\ \hline
**Year** & **Name** & **Focus** & **Media** & **SRC** & **HRC** & **TS** & **Distortion** & **Methodology** & **Scale** & **MOS** & \# \\ \hline
2010 & PLYM [40] & Mobile IP & V: 144 p, 8-15 fps, 7-14 s & 6 & 10 & 60 & VC, TE & ACR & 9-point & MOSa,v2A & 16 \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\ \hline
2012 & VQEG-MM [19] & IPTV & V: 480 p, 30 fps, 10 s & 10 & 5 & 60 & AC, VC & ACR & [1-5] & MOSav & 35 \\  & & & & & & & & & & & & & \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\ \hline
2012 & TUM [41] & IPTV & V: 1080 p, 50 fps, 10 s & 5 & 4 & 20 & VC, TE & ACR & 11-point & MOSav & 21 \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\ \hline
2013 & Live-Music [42] & Music & V: YouTube & 100 & 5 & 500 & ACA, BE, WCN & MRR & [0-1] & MOSa & 60 \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\  & & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\ \hline
2013 & VTT [40] & Streaming & V: 1080-720-480 p, 20-30 fps 10 s & 12 & 125 & AC, VC, TE & ACR & [1–5] & MOSa,v2A & 24 \\  & & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\ \hline
2016 & MMSFC [45] & IPTV & V: 1260-1080-720 p, 24 fps & 9 & 3 & 27 & Display devices & ACR & [1–9] & MOSa,v2 & 20 \\  & & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\ \hline
2017 & LVVE Mobile Stall [46] & Mobile IP & V: YouTube, 2760-460-360 p & 24 & 26 & 174 & Video stalling & ACR & [1–5] & MOSv & 54 \\  & & & & & & & & & & & & \\ \hline
2018 & UnB-AVO 2018 [47] & IPTV & V: 720 p, 30 fps, 42.0 & 60 & 12 & 720 & VC: H264-H265, TE, FF & Immersive & [1–5] & MOSav & 60 \\  & & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & \\  & & & & & & & & & & & \\ \hline
2018 & UnB-AVO 2018 [47] & IPTV & V: 720 p, 30 fps, 42.0 & 40 & 20 & 800 & Ch, Cl, CS, Ec, BG Noise & Immersive & [1–5] & MOSav & 40 \\  & & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & \\ \hline
2018 & LVVE-NFLX-II [24] & IPTV & V: 1080 p, 30 fps, 25 s & 15 & 28 & 420 & TE, BA & ACR & [1–100] & MOSv & 65 \\  & & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\  & & & & & & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Audio-visual quality assessment databases and perceptual studies. A: Audio; S: Speech; M: Music; V: Video; A/V: Audio-visual; TT: Telephone transmission; SRC: Source stimuli; HRC: Hypothetical reference circuit; TS: Test sequences; \(n\): Number of subjects; BG: Background noise; AC: Audio compression; CS: Competing speaker; Ec: Echo; Ch: Chop speech; Cl: Clipping ACA: Amplitude compression and amplification; BF: Butterworth filtering; WCN: White and crowd noise; VC: Video compression; TE: Transmission Errors; FF: Frame Freezing; BA: Bitrate adaptation. experts using empirical criteria. This consisted of examining the audio and video sequences and choosing very clear quality levels, which will then be considered as the experimental test conditions of the study. It is understood that the combination of some of these audio and video distortions, and the test conditions considered, do not necessarily appear in a real transmission scenario.