[mediacapture-main] what is the default channelCount (#775)

fippo has just created a new issue for https://github.com/w3c/mediacapture-main:

== what is the default channelCount ==
https://w3c.github.io/mediacapture-main/#def-constraint-channelCount doesn't say which is the default.

Chrome recently changed from 1 to 2 as we noticed in https://github.com/w3c/webrtc-extensions/issues/63#
fiddle: https://jsfiddle.net/fippo/c0ax4tv1/1/ (note: might require a stereo-capable mic; macbook mics are not)

Please view or discuss this issue at https://github.com/w3c/mediacapture-main/issues/775 using your GitHub account


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