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Re: [mediacapture-fromelement] Specify alpha channel.

From: Martin Thomson via GitHub <sysbot+gh@w3.org>
Date: Fri, 03 Feb 2017 00:17:17 +0000
To: public-media-capture-logs@w3.org
Message-ID: <issue_comment.created-277127393-1486081036-sysbot+gh@w3.org>
@uysalere, I think that this is a little weak as it stands.  As we 
discussed today, I think that we should:

1. require that alpha is preserved in the track
2. note that alpha might not be preserved by consumers of the track, 
for example, not all WebRTC codecs, or implementations of those 
codecs, support sending alpha channel (actually I think that none of 
them do, and that attempting to send alpha would be a great way to 
cause failures, but that's a problem for those guys)

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