I want browsers to extract subtitles from a video files and provide them to the user

[WebWeWantBot]

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title: I want browsers to extract subtitles from a video files and provide them to the user
date: 2021-06-23T14:13:04.062Z
submitter: Farai Gandiya
number: 60d34170fb71fd5410d90b2d
tags: [ ]
discussion: https://github.com/WebWeWant/webwewant.fyi/discussions/
status: [ discussing || in-progress || complete ]
related:

• title:
  url:
  type: [ article || explainer || draft || spec || note || discussion ]

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Videos on the web are typically packaged in MP4s and WebM containers. In addition to storing the video and accompanying audio, those containers can have embedded captions. It would be nice if browsers could extract those and provide them to users instead of having to specify them in the track element.

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If posted, this will appear at https://webwewant.fyi/wants/60d34170fb71fd5410d90b2d/

[gregwhitworth]

This is a valid ask for the Media WG.