: This is the video compression codec used. It is the industry standard for high-quality video that keeps file sizes manageable without losing significant detail.
When you see a string like The.System.2022.1080p.WEBRip.x264.AAC5.1 , it is a standardized naming format used by release groups to describe the quality and source of the video: : Represents the resolution ( subtitle The.System.2022.1080p.WEBRip.x264.AAC5...
If you have this specific version and need subtitles, several community-driven platforms provide files specifically synced to this release: : This is the video compression codec used