W3C home > Mailing lists > Public > public-media-capture@w3.org > September 2018

Re: getDisplayMedia() and system audio

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Wed, 5 Sep 2018 23:23:45 +1000
Message-ID: <CAHp8n2nV0TP4XCRe3X+Yc0Ux20DPyma2jDDMFppabJJYPb=ybg@mail.gmail.com>
To: hbos@google.com
Cc: public-webrtc <public-webrtc@w3.org>, public-media-capture@w3.org
We definitely want the audio of the shared screen be able to be added
to the screenshare stream. However, the audio of the user should be
excluded because that makes the audio unusable if you already have a
video call going and add the screenshare. The more separate streams
there are, the easier it is to control and add them individually.

HTH.

Thanks,
Silvia.
On Wed, Sep 5, 2018 at 11:12 PM Henrik Boström <hbos@google.com> wrote:
>
> Howdy,
>
> The Screen Capture spec for getDisplayMedia() currently does not handle the case of screen share with system audio (issue) 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 13:24:24 UTC

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