问题 Using HTML5 I am trying to get the attribute (ie rotation), located in the header of a mp4 (I play it using a video tag), to do this I am trying to get the bytes that make up the header, and knowing the structure, find this atom. Does anyone know how to do this in javascript? 回答1: I do not think you can extract such detailed metadata from a video, using HTML5 and its video-tag. The only things you can extract (video length, video tracks, etc.) are listed here: http://www.w3schools.com/tags