Technical summary
: This refers to the audio channels . It indicates a surround sound setup: five full-bandwidth channels (Front Left, Center, Front Right, Surround Left, Surround Right) and one low-frequency effects channel (the subwoofer).
A modern compression standard (High Efficiency Video Coding). It allows for 4K video to be stored in smaller files without losing significant visual quality compared to older codecs like x264.
If you don’t have 4K equipment, the standard Blu-ray (released earlier) looks excellent. It’s from a 4K master downscaled to 1080p with lossless audio. You can find it used for under $10.
Essential for 4K content, 10-bit depth supports over a billion colors. This results in smoother gradients (no "banding" in the sky or shadows) and better contrast, especially if you have an HDR-capable display.
: This indicates the resolution of the video. In this case, it's 2160p, which is also known as 4K. It signifies that the video has a high resolution, suitable for high-definition displays.