Optional altOptional attributes?: MetadataAttribute[]A bag of attributes that can be used to store any kind of metadata that is not currently supported by the standard.
Optional cover?: URIThe cover image for the video.
Optional duration?: numberHow long the the video is in seconds.
The location of the file.
Optional license?: MetadataLicenseTypeThe license for the video.
The mime type of the video.
The alt tag for accessibility.