This is a request to extend the metadata parsing of video files to display standard metadata available in webm video files on Commons image pages.
The definitions at https://www.webmproject.org/docs/container/ take you to https://matroska.org/technical/specs/tagging/index.html for a listing of standard tags that should be accepted for display when available. Using ffmpeg when reprocessing from other formats allows the adding of metadata in this format, and EXIF readers will display these tags for webm files, but Commons currently ignores them.
Some tags have immediate and obvious value to Wikimedia Commons and reusers, such as the COPYRIGHT and URL tags, which can help to confirm the status and source of files even when separated from their original web pages or renamed.
As an example Defending_Our_Future-_Protecting_Humans_and_Animals_from_Antibiotic_Resistance.webm has embedded the following tag name/string pairs if the file is examined in http://exif.regex.info/exif.cgi:
Tag Name COMMENT Tag String https://commons.wikimedia.org/wiki/User:Fae/Project_list/CDC_videos Tag Name URL Tag String https://www.youtube.com/watch?v=5VNIL3gbqfI Tag Name PUBLISHER Tag String Centers for Disease Control and Prevention (CDC) Tag Name COPYRIGHT Tag String Public Domain Tag Name SUBJECT Tag String Antibiotic Resistance Tag Name DATE_RELEASED Tag String 2019-10-31