W3C home > Mailing lists > Public > public-media-capture@w3.org > October 2012

synchronization

From: Jim Barnett <Jim.Barnett@genesyslab.com>
Date: Wed, 17 Oct 2012 08:19:51 -0700
Message-ID: <E17CAD772E76C742B645BD4DC602CD8106DB5C59@NAHALD.us.int.genesyslab.com>
To: <public-media-capture@w3.org>
The spec says that synchronization happens at the MediaStream level, but
doesn't explain how it occurs.  It also doesn't explain how clients get
media from either MediaStream or Track.  This leaves some edge cases up
in the air.  Suppose we have Tracks t1 and t2 inside MediaStream m1 and
Tracks t2 and t3 inside MediaStream m2:  will m1's clients and m2's
clients see the data from t1 and t3 as synchronized?  t1 and t3 are both
synchronized with t2, but in different MediaStreams.  Is synchronization
transitive across MediaStreams?

 

Another way to put it is to ask whether the different MediaStreams can
provide different synchronizations.  Can m2 provide data from t2 that is
not synchronized with t1?   If synchronization is purely at the
MediaStream level, it would seem to me that should be allowed.  On the
other hand, if we mean that it is the MediaStream's job to make sure
that the Track _objects_ are synchronized, then if t1 is synced with t2
in one MediaStream, it will be synched with it in _any_ MediaStream.
(So synchronization would be transitive across MediaStreams.)

 

-          Jim
Received on Wednesday, 17 October 2012 15:21:08 GMT

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