Short for Multi-Subtitles or Multiple Subtitles included within the file.
Because it is "Dual" and "MSub," you can switch between languages and subtitles during playback:
This is the title and release year. It likely refers to a specific regional or international series/movie (e.g., Vakeel Saab or a similarly titled production released/re-released in 2023).
These terms refer to High Efficiency Video Coding . It is a modern compression standard that provides high-quality video at much smaller file sizes compared to older formats like H.264.