“Media Capture from DOM Elements” document by W3C defines captureStream() method that allows the capture of a <video>/<audio> element in the form of a MediaStream. We want to implement the necessary Blink and Chromium sections that would create this stream by accessing the <video>/<audio> output according to the given play back constraints.

Demo

• https://rawgit.com/Miguelao/demos/master/videoelementcapture.html

Documentation

• https://developers.google.com/web/updates/2016/10/capture-stream
• https://developer.mozilla.org/en-US/docs/Web/API/Media_Streams_API

Specification

Editor's draft

Status in Chromium

Blink components: Blink>MediaStream>CaptureFromElement

Enabled by default (tracking bug) in:

• Chrome for desktop release 62
• Chrome for Android release 62
• Android WebView release 62

Consensus & Standardization

• Firefox: Shipped/Shipping
• Edge: No signal
• Safari: No signal
• Web Developers: Positive

Owners

• mcasas@chromium.org
• niklase@chromium.org

Comments

Gecko has a prefixed implementation. Probably landed this as part of https://bugzilla.mozilla.org/show_bug.cgi?id=664918.

Last updated on 2021-05-05