This indicates the movie has been split into multiple compressed archive parts. You will need all parts (Part 1, Part 2, etc.) in the same folder to extract the full movie file. Important Consideration
The video compression codec used to keep the file size manageable while maintaining 4K quality.
The audio format. It uses Dolby Digital Plus 5.1 with Dolby Atmos metadata for spatial surround sound.
High Dynamic Range. This ensures better contrast and a wider color gamut on compatible screens.
The name of the "release group" that packaged and uploaded the file.