Often encoded in AAC or AC3 for high-quality sound.

The "38" in 3816 often serves as shorthand for the pixel resolution, widely known as 4K UHD.

Below is a feature breakdown of the technology and standards that define files of this nature. 1. Resolution and Clarity

Information such as subtitles, chapter markers, and still images. 3. Core Compression (Codecs)

This resolution is the standard for high-end streaming, modern gaming, and professional cinematography. 2. The MP4 Container Format

MP4 (MPEG-4 Part 14) is the world's most popular digital multimedia container. It is a "wrapper" that holds several types of data together in one file: The visual data compressed by a codec.

It provides four times the detail of standard 1080p HD.