This tag indicates that the video was compressed using the x264 open-source encoder library. It outputs video encoded in the H.264 / MPEG-4 AVC standard.
A very specific query!
📝 This stands for "English Subtitles," which are either hardcoded or muxed into the file for accessibility and clarity during quiet dialogue. Why This Format Remains Popular the prestige 2006 x264 720p esub bluray dual au