4K files are significantly larger than HD files; for example, one hour of 4K footage can require substantial storage space, and a 1TB drive might hold fewer than 35 feature-length 4K movies.
This is likely a unique Asset ID or serial number used by a database (such as a stock photo/video agency) to identify this specific clip among millions. 2160P_15000K_287326912mp4
4K video contains over 8.2 million pixels , which is four times the pixel count of standard 1080p Full HD. 4K files are significantly larger than HD files;
The standard digital multimedia container format used to store video, audio, and subtitles. Key Characteristics of 2160p Content 2160P_15000K_287326912mp4