(b-global 3840x2160 Hevc Aac Mkv) [af1... — [ ] - 08

The string you provided appears to be a technical file name for a digital media release, typically associated with high-quality video encoding groups. Based on the naming convention,

: Part of the tag for the Release Group or encoder responsible for the file.

: Likely refers to the source being a Bilibili Global stream or a specific regional Blu-ray release. 3840x2160 : The resolution, which is 4K Ultra HD .