This was [recently](https://github.com/w3c/mediacapture-main/pull/594) clarified by [this note](https://w3c.github.io/mediacapture-main/getusermedia.html#media-track-supported-constraints): *"The constraints specified in this specification apply only to instances of MediaStreamTrack generated by getUserMedia(), unless stated otherwise in other specifications."* For example, [mediacapture-screen-share](https://w3c.github.io/mediacapture-screen-share/#constrainable-properties-for-captured-display-surfaces) specifies the constrainable properties of tracks from `getDisplayMedia()`, and [how](https://w3c.github.io/mediacapture-screen-share/#downscaling-and-frame-decimation) to implement them. In other words, it is up to webrtc-pc to specify what constraints remote tracks have. This is being discussed in https://github.com/w3c/webrtc-pc/issues/2121. > should we just ignore such members as latency or echoCancellation on remote audio tracks FWIW, about those members specifically, [webrtc-pc](https://w3c.github.io/webrtc-pc/#mediatracksupportedconstraints-mediatrackcapabilities-mediatrackconstraints-and-mediatracksettings) already says: *"This means that certain members, such as facingMode, echoCancellation, latency, deviceId and groupId, will always be missing."* -- GitHub Notification of comment by jan-ivar Please view or discuss this issue at https://github.com/w3c/mediacapture-main/issues/619#issuecomment-528092689 using your GitHub accountReceived on Wednesday, 4 September 2019 21:22:32 UTC
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