[Live-devel] synchronisation in a multithreading application
epeters at graphics.cs.uni-sb.de
Fri Nov 26 14:43:16 PST 2004
as Ross mentioned I read the FAQ and the source code of MPlayer and
openRTSP. I found the following difference between this code and my
code. MPlayer and openRTSP are using MediaSession and MediaSubsessions.
Do I need a MediaSession and for each media source a subsession for
lipsynchronous video on the receiver side?
What I don't understand is the following. In my example I have one
thread for each media source and in each thread I have a
UsageEnvironment and a TaskScheduler and for each media source I created
a RTCPInstance. Each media stream know nothing about the other media
streams. So, how can they be synchronized via RTCP? How can liveMedia
compute synchronous presentation timestampsin different threads?
Shouldn't there be a controller which manages this? Is this the
Is it generally possible to create such a multithreaded receiver
application with synchronous audio/video?
Thanks in advance
Eric Peters wrote:
> Hello to all,
> I have written an application which decodes a DVD with some different
> audio tracks (different languages for example). Now I want to stream
> this video and audio tracks over RTP using liveMedia. So it should be
> possible on the client side to see the movie in different languages.
> For example I stream the movie and the audio multicast on the following
> audio1 (english): 6666
> audio2 (german): 6668
> audio3 (french): 6670
> video: 8888
> So, when I use a sdp-file which includes audio on port 6668 and video on
> port 8888 I want to see the movie in german.
> Now my question: This is an multithreading application. I read the FAQ
> for threads and I have for each streaming instance my own
> UsageEnvironment and TaskScheduler. But on the client side I have
> problems to synchronize the audio and video tracks.
> Is this synchronisation possible at all when I use independent
> UsageEnvironment and TaskScheduler? Or aren't the UsageEnvironments and
> TaskSchedulers completely independent from each other?
> How can I synchronize the audio and video track? Which timestamps/values
> schould I use for synchronisation?
More information about the live-devel