I've attached my test program, each stream has rtcp, and the timestamps
are being set using timeofday. The VLC says the streams are
synchronized, but I am looking into doing more debug on the client side.
It looks like the video is started streaming before the audio and that
is where the streams get out of sync. I noticed this because I was
outputting the timestamps and saw that when starting up the video
streams out data for a little bit before audio starts up.
thanks for the help,
mike
On Thu, 2008-06-12 at 22:56 -0700, Ross Finlayson wrote:
> >How do you go about streaming video and audio at the same time using
> >RTSP? I want to stream two elemental streams that I got out of a mp4
> >file to VLC and have them playback just as if I was watching the
> >original file. Using the testOnDemandRTSPServer I can open the video
> >stream in one instance of VLC and the audio stream in another instance
> >of VLC. How do you put the pieces together?
>
> Using a single "ServerMediaSession", containing two
> "ServerMediaSubsession" objects - one for video; the other for audio.
>
> Also, to ensure that the audio and video get synchronized at the
> client, you *must* give them accurate presentation times at the
> server end - and implement RTCP for each stream. Also (and this is
> important), the presentation times *must* correspond to 'wall-clock'
> time - i.e., the time that you would get by calling "gettimeofday()".
>
> If you do this, then the presentation times that come out the client
> end (after RTCP-synchronization) *will* be same as those that you
> gave the frames at the server end, and then the client will be able
> to use those to synchonize audio and video.
#include "liveMedia.hh"
#include "BasicUsageEnvironment.hh"
#include "GroupsockHelper.hh"
int main(int argc, char** argv) {
// Begin by setting up our usage environment:
UsageEnvironment* env;
TaskScheduler* scheduler = BasicTaskScheduler::createNew();
env = BasicUsageEnvironment::createNew(*scheduler);
char const* inputFileName = "test.m4e";
char const* FileName = "test.aac";
struct in_addr destinationAddress;
destinationAddress.s_addr = chooseRandomIPv4SSMAddress(*env);
// Note: This starts RTCP running automatically
RTSPServer* rtspServer = RTSPServer::createNew(*env, 8554);
if (rtspServer == NULL) {
*env << "Failed to create RTSP server: " << env->getResultMsg() << "\n";
exit(1);
}
ServerMediaSession* video = ServerMediaSession::createNew(*env, "testStream", "testStream",
"Session streamed by elementStreamer", True /*SSM*/);
video->addSubsession(MPEG4VideoFileServerMediaSubsession::createNew(*env, inputFileName, true));
video->addSubsession(ADTSAudioFileServerMediaSubsession::createNew(*env, FileName, true));
rtspServer->addServerMediaSession(video);
char* url = rtspServer->rtspURL(video);
*env << "Play this stream using the URL \"" << url << "\"\n";
delete[] url;
// Start the streaming:
*env << "Beginning streaming...\n";
env->taskScheduler().doEventLoop(); // does not return
return 0; // only to prevent compiler warning
}
fileName = test.m4e
fileName = test.aac
creating new mpeg4 video file server media subsession
video file size = 21465361
playing dummy file
scheduling checkforauxsdpline task
checking for auxsdpline
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 284506
video timestamp: 1213369610 350506
video timestamp: 1213369610 350506
video timestamp: 1213369610 416506
video timestamp: 1213369610 416506
setting done flag for auxdspline
checking for auxsdpline
creating new stream source
creating new mpeg4 video file server media subsession
video file size = 21465361
creating new stream source
setting fTimestampBase: 1595972578
setting fTimestampBase: 2420410699
audio timestamp: 1213369610 389970
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
video timestamp: 1213369610 387410
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video timestamp: 1213369610 453410
video timestamp: 1213369610 453410
audio timestamp: 1213369610 421970
audio timestamp: 1213369610 453970
video timestamp: 1213369610 519410
video timestamp: 1213369610 519410
audio timestamp: 1213369610 485970
audio timestamp: 1213369610 517970
video timestamp: 1213369610 585410
video timestamp: 1213369610 585410
audio timestamp: 1213369610 549970
audio timestamp: 1213369610 581970
video timestamp: 1213369610 651410
video timestamp: 1213369610 651410
audio timestamp: 1213369610 613970
audio timestamp: 1213369610 645970
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audio timestamp: 1213369610 677970
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video timestamp: 1213369610 783410
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audio timestamp: 1213369610 741970
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video timestamp: 1213369610 849410
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audio timestamp: 1213369610 805970
audio timestamp: 1213369610 837970
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audio timestamp: 1213369610 869970
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audio timestamp: 1213369610 933970
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video timestamp: 1213369611 387410
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audio timestamp: 1213369611 61970
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audio timestamp: 1213369611 125970
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audio timestamp: 1213369611 189970
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audio timestamp: 1213369611 285970
audio timestamp: 1213369611 317970
audio timestamp: 1213369611 349970
audio timestamp: 1213369611 381970
video timestamp: 1213369611 453409
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audio timestamp: 1213369611 413970
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video timestamp: 1213369612 387410
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audio timestamp: 1213369611 541970
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audio timestamp: 1213369615 189970
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