[Live-devel] How to sync H264 and AAC timestamp from live streaming

[Eric_Hsieh at alphanetworks.com]

Dear Ross,

I am a new guy to learn live555 and porting it into our platform.
Now, we are coding a RTSP server based on testOnDemandRTSPServer sample code.
We create 4 new classes to read H264 and AAC frames from our ring buffer not file.
Each time call doGetNextFrame(), the class will deliver a “discrete” frame to fTo.
Now, what we face is very familiar with
http://lists.live555.com/pipermail/live-devel/2014-September/018686.html
http://live-devel.live.narkive.com/0Idqc0Pj/aac-h264-rtp-multicast-timestamps
And, we sure
1. AV's fPresentationTime is correct. We have 2 program to get A/V frames from V4L2 device.
And, when we get one frame, we will mark timestamp(gettimeofday) for each one
and put it into ring buffer.
2. Video’s fDurationInMicroseconds is 0.
3. Only video stream is working well.
4. Only audio stream is also working well.
5. Stream A/V at same time, in the begin, AV is sync.
After 1~2 minutes, video start to drift.
VLC show ”more than 5 seconds of late video, drop” and
video stop, audio is still going well.
6. Now, we use  H264VideoStreamFramer not H264VideoStreamDiscreteFramer,
  because we need a parser to create SDP for H264.

Any suggestions? Thanks for your kindly help.

regards, eric, 10/02


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