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List: kde-multimedia
Subject: Re: Vote for a MM system (Was: Re: summary of the aKademy meetings)
From: Marco Lohse <mlohse () cs ! uni-sb ! de>
Date: 2004-09-12 7:50:30
Message-ID: 4143FFC6.2060704 () cs ! uni-sb ! de
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Lennart Poettering wrote:
>On Fri, 10.09.04 17:15, Marco Lohse (mlohse@cs.uni-sb.de) wrote:
>
>
>
>>>
>>>
>>... at least for NMM, this problem (inter-stream synchronization of
>>audio/video) is solved (with the help of NTP):
>>http://graphics.cs.uni-sb.de/NMM/News/Events/CeBIT2004/index.html
>>
>>
>
>How do you assure to have a common time source?
>
As basis, we use NTP, the network time protocol.
>
>I can add something like this to polypaudio as well.
>
>
Having some sort of global time is just a starting point for
inter-stream synchronization. And using NTP, this is rather easy to achieve.
However, for doing distributed synchronization, there a lot of other
issues that have to be resolved: different paths in your multimedia data
flow graph have different and varying latencies, different output
devices have different latencies, ..., finally, you also need a way to
'speak' with distributed parts of your application.
If you are interested in how distributed synchronization is realized
within NMM, feel free to take a look at our documentation:
http://graphics.cs.uni-sb.de/NMM/Docs/index.html
Have fun, Marco.
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