Oppenheimer.2023.1080p.bluray.ddp5.1 -cm-: Tsk.mp4

The file extension .mp4 (MPEG-4 Part 14) is the container. It holds the video stream (H.264 or H.265), audio streams (AAC, DDP, AC-3), and subtitles.

Why MP4 over MKV?

Trade-off: MKV would have allowed the original BluRay’s PGS subtitles or multiple audio languages. This MP4 likely contains only the DDP5.1 English track and possibly one set of softcoded subtitles (SRT). Oppenheimer.2023.1080p.BluRay.DDP5.1 -CM- TSK.mp4

DDP stands for Dolby Digital Plus (codec: E-AC-3). It is the successor to standard Dolby Digital (AC-3). The file extension

1080p indicates a vertical resolution of 1080 pixels. This is Full High Definition (FHD). The p stands for progressive scan, meaning every frame is drawn sequentially (as opposed to i for interlaced, which is obsolete for modern files). Trade-off : MKV would have allowed the original