Review mute/unmute/ended and constraints on tracks from element.captureStream()

[jan-ivar]

As per w3c/mediacapture-main#984, review mute/unmute/ended and constraints on tracks from element.captureStream().

element.captureStream specifies when to end a track as follows (which seems sound):

It says a lot more about muted/unmuted (tying it to "available" (reactive) and "accessible" (same-origin) content):

This might make sense for this source. E.g. an effort seems made to carry forward state of tracks in srcObject.

No mention of constraints.

Relevant open issues found:

• define behaviors of the common ConstrainablePattern Interfaces  #48
• Inconsistency: Taint, not mute cross-origin element tracks #83

[dontcallmedom-bot]

This issue was mentioned in WebRTC March 26 2024 meeting – 26 March 2024 (Clarify each source is responsible for specifying mute/unmute/ended and constraints behavior)