This refers to the vertical resolution: 1920x1080 pixels, progressive scan. Unlike 720p (HD ready) or the standard definition of original DVDs, 1080p offers full clarity. When you watch the pilot episode, "Pilot," in 1080p, you see every stitch in Oliver’s leather hood and every grain of sand on the island.
A: Yes. Because it uses x264 (not x265) and standard AAC audio (usually), you can play the file natively. If it only has DTS audio, you may need VLC or MX Player to decode it. Arrow S01 1080p Bluray X264 Rovers