[mediacapture-fromelement] Must the alpha channel be preserved, and what about encoding in an alpha-less format?

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

== Must the alpha channel be preserved, and what about encoding in an 
alpha-less format? ==
http://w3c.github.io/mediacapture-fromelement/#widl-HTMLCanvasElement-captureStream-MediaStream-double-frameRate

This doesn't say anything about alpha, but this spec may be the first 
time that we have `MediaStream`s with alpha channels. In 
http://software.hixie.ch/utilities/js/live-dom-viewer/saved/3899 
Firefox and Chrome get different behavior, Firefox preserves the alpha
 channel while Chrome discards it.

Note that the test isn't entirely reliable in Chrome, not sure why:
https://code.google.com/p/chromium/issues/detail?id=587793

Please view or discuss this issue at 
https://github.com/w3c/mediacapture-fromelement/issues/30 using your 
GitHub account

Received on Thursday, 18 February 2016 10:46:41 UTC