[Live-devel] Problem with fPresentationTime

[Jeremy Noring]

I have an OnDemand RTSP server based around Live555 that streams out live
H.264; I implemented a subsession and framer.  On the client side, I have a
receiver application based loosely around openRTSP, but with my own custom
H264 MediaSink class.

My problem is fPresentationTime; the values I hand off to Live555 on the
server side are not the values I get on the client side.  Furthermore, the
_first_ value I receive on the client side is always crazy, and then values
thereafter appear to increase monotonically (although they still differ from
what was supplied to the server).  I think I'm misunderstanding something
here.

In the server, my samples come to me timestamped with a REFERENCE_TIME,
which is an __int64 value with 100 nanosecond units.  So to convert from
this to the timeval, I do the following:

        // Our samples are 100 NS units.  So to get to usec, we divide by
10.
        fDurationInMicroseconds = sample->m_duration / 10;
        REFERENCE_TIME sampleTimeInUsec = sample->m_time / 10;
        fPresentationTime.tv_sec = (long) sampleTimeInUsec / 1000000;
        fPresentationTime.tv_usec = (long) sampleTimeInUsec % 1000000;

...I am likely doing something wrong, but I don't understand why the first
timestamp I get on the receiver is out in left field.  Could it be that
running on Windows has some effect on the time stamp?  (both server/client
are running on Win32)

Any help is much appreciated.
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