[prev in list] [next in list] [prev in thread] [next in thread]
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: 2004-09-10 15:15:34
Message-ID: 4141C516.6080703 () cs ! uni-sb ! de
[Download RAW message or body]
Lennart Poettering wrote:
>That part isn't a problem. The issue is synchronization, meaning: when
>will the sample I write to the sound server now be played? It is
>impossible to solve this problem precisely. See: you're playing a
>movie on machine A using a sound card on machine B. To synchronize
>video and audio the movie player needs to know when to show the right
>video frame for the a certain sound sample. So it queries machine B:
>"what is your current latency?". This request takes some time to
>travel to machine B, let's say 10ms. Machine B replies with
>"50ms". That reply takes some time to travel back to machine A. let's
>say 5ms. The real latency is 50ms+10ms. but machine A can only
>estimate that the real latency is something like 50ms+7.5ms. (7.5ms is
>half the roundtrip time.)
>
>
>
>
... 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
Have fun, Marco.
_______________________________________________
kde-multimedia mailing list
kde-multimedia@kde.org
https://mail.kde.org/mailman/listinfo/kde-multimedia
[prev in list] [next in list] [prev in thread] [next in thread]
Configure |
About |
News |
Add a list |
Sponsored by KoreLogic