"People are still buying TVs primarily for the audio-video quality," Mr. Anderson said.
In just a handful of years streaming media technology has leapfrogged from less-than-standard definition video to rather solid 720p HD video, but the quality of even the best video-on-demand OTT services still falls short of broadcast television and Blu-ray audio-video quality.
Parameters for audio-video quality have been optimized in order for the system to adapt the users' network environment without suffering from bad audio-video quality.
For diagnostic purposes, we can compute the audio and video impairment factors and and thus, using (1), know what the audio and video quality impact due to audio and video degradations is.
However, we can notice that the impairment-factor-based model performs better than the quality-based model in all cases, except for the training data, where the audio and video quality are predicted from the audio and video quality models.
However, the proposed models have some limitations: when the audio and video qualities and impairment factors are predicted from audio and video quality models, the impairment-factor-based variants are less robust to audio and video quality prediction errors than the quality-based variants.
Vertical and horizontal lines connect data points obtained for similar audio and video quality levels, respectively (La1, La4, and La7 for audio and Lv1 and Lv7 for video).
Vertical and horizontal lines connect data points obtained for similar audio and video quality levels, respectively (La1, La3, and La7 for audio and Lv1, Lv3, and Lv7 for video).
This result was expected from the observation we made on the correlations between audio and video qualities (see Section 3): the impact of audio and video quality is more balanced for content E than for the other contents.
where is the predicted audio or video quality, and is the base quality level the transmitted audio or video signal can reach for the respective target service.
