[Live-devel] Problem streaming live audio and video

[Ross Finlayson]

> I'm trying to stream live H.264 video and live G.711 audio, using
> testMPEG1or2AudioVideoStreamer.cpp as an example.

I'm not sure how much of an 'example' the "testMPEG1or2AudioVideoStreamer" code can be, given that it streams from a file source, and uses completely different codecs (and thus uses completely different "RTPSink" subclasses).  But anyway...


> Both video
> and audio come from hardware encoders. As soon as encoded buffer
> is available, live555 code is notified via event trigger associated
> with media source. I'm using VLC to play the stream.
> 
> The problem is that video freezes almost immediately.
> If only video is streamed, there's no problem.
> 
> I suspect that audio can starve video since audio frame size produced
> by encoder is 160 bytes and some find of aggregation is required.
> Does this sound right ?

That's a possibility.  However a more likely cause of problems like this is that you are setting "fPresentationTime" incorrectly for one or both of your audio and video substreams - so they end up being non-synchronized at the receiver (VLC) end.

For each frame delivered by your input source, "fPresentationTime" must be set properly, and must be aligned with 'wall clock' time - i.e., the time that you'd get by calling "gettimeofday()".


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/

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