media synchronization

hi shady,

here's what i found : "CNAME is normally used in older JMF RTP API(javax.media.rtp.SessionManager), with the new one(javax.media.rtp.RTPManager) , CNAME can be handled internally."

This means that your CNAME (canonical name) is already handled by RTPManager and it is the same for video and audio. For instance, CNAME for one PC will always be shady@mypc (in my case CNAME for my desktop is always Andrey@ratm). Which means, that it is already set for you. From here it follows, that synchronization doesnt work in JMF.

If I were you, i wouldnt bother about trying to sync audio and video (i know I dont do it). From my experience, learners need video no matter what quality or rate it is just FOR REFERENCE. What they need much more is audio, shared slides and a group chat. Those 3 you must focus on.

andreyvka at 2007-7-8 2:03:03 >

I understand what you need.

1. Unfortunatelly, I dont know how to play with timestamps in RTP. All I know is that timestamp can be set with Buffer class. In general, you have to "manually" transmit video/audio Buffer by Buffer. I really dont know how it's done in details, but something to do with implementing your own Push/PullDataSource. On the receiver's side, you will receive audio/video, extract timestamps and sync your media streams. One thing i know for sure is that this is a hell of a job.

Can someone, plz, suggest something to shady on RTP timestamps in JMF? I remember there was some sort of example on this, but dont remember where.. :(

2. Could you, please, tell my WHY audio/video synchronization is so important for you? I still dont understand..

andreyvka at 2007-7-8 2:03:03 >

shady.. one request though.. plz, dont call me Mr... im barely your age.

anyway, hope i could be of better help... can someone, please, help shady on using Buffers?

anyway, take a look at JMF solutions (http://java.sun.com/products/java-media/jmf/2.1.1/solutions/) maybe some of them can give you a clue.

btw, was it you who had problems merging video and audio into a single data source?

andreyvka at 2007-7-8 2:03:04 >

Thanks andry for ur reply, and am sorry about saying mr but i thought this thing represent my respect to whom help me..

1) and about what u said about merging>> yes i have athread before about this subject.... and if u want any help i can do for u...

2) about the frame acces example i had it before but it not help me about time stamp..

i wait any reply for time stamp handling with buffer..

shadya at 2007-7-8 2:03:04 >

hijo lo que queres hacer es una manteca... no te enrolles es muy facil asi como esta en el codigo ejemplo asi tenes que seguir....

mira..

if (controllerEvent instanceof RealizeCompleteEvent) {

System.out.println("controllerUpdate..........[ControllerEvent controllerEvent] ");

System.out.println("- RealizeCompleteEvent ");

PlayerWindow pw = find(p);

if (pw == null) {

// Some strange happened.

System.err.println("Internal error!");

System.exit(-1);

}

String ssrc = getSSRCFromPlayer(p);

PlayerHash pHash = (PlayerHash)players.get(ssrc);

if (p == pHash.playerVideo){

System.out.println("- Video player initilized");

pHash.playerVideoInit = true;

} else {

System.out.println("- Audio player initilized");

pHash.playerAudioInit = true;

}

pw.initialize();

if (pw.getFormat() instanceof VideoFormat){

pw.setVisible(true);

}

//p.start();

if (pHash.playerVideoInit && pHash.playerAudioInit){

try {

pHash.playerAudio.setTimeBase(pHash.playerVideo.getTimeBase());

pHash.playerAudio.addController(pHash.playerVideo);

pHash.playerAudio.setRate(1F);

pHash.playerAudio.start();

} catch (IncompatibleTimeBaseException ex) {

ex.printStackTrace();

}

}

}

culosabrosoa at 2007-7-8 2:03:04 >