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Re: getDisplayMedia() and system audio

From: Henrik Boström <hbos@google.com>
Date: Wed, 5 Sep 2018 15:17:51 +0200
Message-ID: <CAEbRw2yE=m9jJSesa0dARSr03mb3PgKL5hrBO7Wdb5tiHxtxLg@mail.gmail.com>
To: public-webrtc@w3.org, public-media-capture@w3.org
Tab capture has proven popular, sharing a particular tab that you are
presenting, including its audio, without including all other system audio
(like remote participants talking) might be very useful. That would be an
argument for filtering audio to be the same as the selected display surface.

On Wed, Sep 5, 2018 at 3:10 PM Henrik Boström <hbos@google.com> wrote:

> Howdy,
>
> The Screen Capture <https://w3c.github.io/mediacapture-screen-share/> spec
> for getDisplayMedia() currently does not handle the case of screen share
> with system audio (issue
> <https://github.com/w3c/mediacapture-screen-share/issues/61>) but it is
> being considered.
> - Is this something we are interested in supporting? E.g. {audio:true}.
> Please discuss.
>
> Use case: I'm presenting something and I want to show an audio & video
> clip as part of the presentation.
>
> With getDisplayMedia(), the user can decide whether to only present a
> window or the entire screen. It is not allowed to constrain source
> selection, and display capture sources are not enumerable (e.g. open
> windows) since that would reveal too much information about the system.
> Some questions if we want screen share with audio...
>
> When only presenting a window, should "audio" include only that window's
> audio or all system audio?
> Should what audio to use be up to the user (similar to choice of display
> surface being up to the user) or something that you either accept or
> reject? (Application asks for audio and video, I only want to accept video?)
>
> There is a risk that the choices or implementations become complicated. We
> should keep things simple, especially since the request means a popup and
> needs to be accepted or rejected by the user. If you share a window + audio
> and the the remote party hears something different than what you hear due
> to sound coming from different windows that might be unexpected and
> confusing.
>
> For presentations + conferences, echo of participants talking might be
> problematic.
>
> What do people want?
>
Received on Wednesday, 5 September 2018 13:18:25 UTC

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