: This is the container format of the file, which is Matroska. It's a flexible, open-standard video container format that can hold an unlimited number of video, audio, and subtitle tracks.
: This suggests the video is in 4K resolution. The "77" might refer to the specific version or quality but typically, 4K refers to a resolution of 3840 x 2160 pixels. 05-star.wars.4k77.2160p.uhd.dnr.35mm.x265-v1.0.mkv
: The first official completed release version of this restoration. : This is the container format of the
May the grain (or lack thereof) be with you. which is Matroska. It's a flexible
: This likely stands for "denoising" or could refer to a specific process or filter applied to the video to reduce noise.