I developed a testing application using LiveMedia to multicast a live Audio and Video feed. Video is compressed to an Mpeg elementary stream and Audio is PCM 2 channels 16 bits sampled at 48000 Hz. I am using VLC and SMPlayer as a client that receive the streams. When audio or video is streamed alone over IP then VLC and SMPlayer both play fine the stream. However when I stream both audio and video together I ran into synchronization problem and both VLC and SMPlayer drop either the video and or audio stream. And playback become jerky.I suspect that I might have missing something when initializing LiveMedia in a context of playing a mixed bag of audio and video stream together. Any hints where I should pay attention to keep both stream synchronized.
You need to make sure that your presentation timestamps (i.e., the value of the "fPresentationTime" field that you set in each source object when implementing "doGetNextFrame()") is accurate, and aligned with 'wallclock' time (i.e., the time that you would get if you were to call "gettimeofday()").
If the "fPresentationTime" field - for both your audio and video sources - is not set correctly (or not set at all), then you will never get proper A/V synchronization.
-- Ross Finlayson Live Networks, Inc. http://www.live555.com/
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