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Comment to issues in MediaStream Capture Scenarios: Preview a stream

From: Bryan Sullivan <blsaws@gmail.com>
Date: Wed, 14 Dec 2011 08:10:21 -0800
Message-ID: <CAA2gsfrLTJSYDwYMuuSzWdUK0rVs2TE9=7R3ad7mny7k-eA1JQ@mail.gmail.com>
To: public-media-capture@w3.org
Re issues in https://dvcs.w3.org/hg/dap/raw-file/tip/media-stream-capture/scenarios.htmlon
"Preview a stream":
Re Issue: "Audio tag preview is somewhat problematic because of the
acoustic feedback problem (interference that can result from a loop
between a microphone input that picks up the output from a nearby
speaker). There are software solutions that attempt to automatically
compensate for these type of feedback problems. However, it may not be
appropriate to require implementations to all support such an acoustic
feedback prevention algorithm. Therefore, audio preview could be
turned off by default and only enabled by specific opt-in.
Implementations without acoustic feedback prevention could fail to
enable the opt-in? ":
[bryan] I would prefer an option whereby the user can mute the mic
output to speakers. This would allow the user to decide based upon the
type/location of the mic and the type/location of speakers in use, and
also allow the app to access the stream e.g. for level-setting
purposes.

Re Issue: "It makes a lot of sense for a 1:1 association between the
source and sink of a media stream; for example, one media stream to
one video element in HTML5. It is less clear what the value might be
of supporting 1:many media stream sinks—for example, it could be a
significant performance load on the system to preview a media stream
in multiple video elements at once. Implementation feedback here would
be valuable. It would also be important to understand that scenario
that required a 1:many viewing of a single media stream. ":
[bryan] I agree, I cannot think of a typical use case that would
require 1:N association.

-- 
Thanks,
Bryan Sullivan
Received on Wednesday, 14 December 2011 16:11:01 GMT

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