That doesn't exist on 4K Blu-ray. 2160p titles use the HEVC codec in combination with discs up to 125GB in capacity to minimize the artifacts as much as possible, but they are never gone.
That's video, anyway. Both 1080p and 2160p discs usually include lossless audio tracks of at least one language. If your box uses terms like "PCM", "DTS-HD MA"/"DTS-HD Master Audio", "Dolby TrueHD", that audio track is lossless.
That doesn't exist on 4K Blu-ray. 2160p titles use the HEVC codec in combination with discs up to 125GB in capacity to minimize the artifacts as much as possible, but they are never gone.
That's video, anyway. Both 1080p and 2160p discs usually include lossless audio tracks of at least one language. If your box uses terms like "PCM", "DTS-HD MA"/"DTS-HD Master Audio", "Dolby TrueHD", that audio track is lossless.