W3C home > Mailing lists > Public > public-webrtc-logs@w3.org > January 2019

Re: [mediacapture-screen-share] Capturing audio-only (#100)

From: henbos via GitHub <sysbot+gh@w3.org>
Date: Wed, 30 Jan 2019 13:48:17 +0000
To: public-webrtc-logs@w3.org
Message-ID: <issue_comment.created-458949476-1548856096-sysbot+gh@w3.org>
Yes this is intentional. Audio capture is perceived as an optional addition to screen capture, something that can exist side-by-side video but is not enforced to have to exist. A `getDisplayMedia({audio:true, video:true})` is allowed to return only a video track if the user wants to share video but not audio, or if the implementation/platform does not support audio capture. A request cannot limit the user's selection (e.g. which window to share since the application is not allowed to know which windows exists), and a request cannot force a user to pick audio. This is different from `getUserMedia()` where audio is non-optional if requested.

In the screen capture case, audio is a lot more technical and its availability to some extent platform-dependent. The spec is purposefully vague about what audio has to be provided. Even to the point of making it optional.

GitHub Notification of comment by henbos
Please view or discuss this issue at https://github.com/w3c/mediacapture-screen-share/issues/100#issuecomment-458949476 using your GitHub account
Received on Wednesday, 30 January 2019 13:48:19 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 19:22:10 UTC