An Impact of the Encoding Bitrate on the Quality of Streamed Video Presented on Screens of Different Resolutions

Abstract

The paper discusses the problem of video quality deterioration caused by watching low resolution videos on high resolution displays. The authors take into account three video codecs, i.e. H.264, H.265 and VP9. The tested video samples are encoded using different bitrates from 300 kbps to 6000 kbps and three spatial resolutions −360p, 480p and 720p. The authors show how the coding bitrates and resizing of the spatial resolution may influence the video quality perceived by the end user. The objective quality values are compared with the results of the previous subjective evaluations. The results showed high correlations between selected objective quality metrics like PSNR, SSIM and VMAF and the quality perceived by the users.