Problem : Audio drops out on multicast

We are using Quicktime to view multicasted feeds. We read in the SDP file, Quicktime goes off, does the connect...all is well..until you try and fast forward to get rid of the latency (customer wants < 100 ms, which Quicktime can do fine). If you get to the end of the buffering, video still works fine, but audio drops out and does not come back. There is also some audio pops while the fastforward occurs. This behaviour is the same on both the standard player and the wrapped version.
Have not seen anything in COM interface that can let me see how much buffering is left, otherwise I could simple keep poking fastforward until I have minimal buffer left.
Here is the SDP file we are using
v=0
o=- 1 1 IN IP4 127.0.0.1
s=RTP session
e=NONE
c=IN IP4 239.1.1.8/3
b=RR:0
t=0 0
m=video 49170 RTP/AVP 96
a=rtpmap:96 MP4V-ES/90000
a=fmtp:96 profile-level-id=245; config=000001b0f5000001b509000001000000012000c48dc0004138c00cc000c20097530c1f4c 2c1078510f000001b2656d347620342e332e322e3400c5ff
a=control:video
m=audio 49172 RTP/AVP 97
a=rtpmap:97 mpeg4-generic/90000/2
a=fmtp:97 streamType=5;profile-level-id=22;mode=AAC-hbr;sizelength=13;indexlength=3;index deltalength=3;config=1190
a=control:audio

There are only two possible causes I can think of:
1. The fiel your'e using out of FCP is bad.
2. The encode that DVDSP created is bad.
> After exporting to DVD using compressor, the audio on the DVD completely goes away 49 seconds in.  It's there on the master in FCP, but not on the DVD.  It goes away in simulator too.  <
How did you export out of FCP? I always use a self-contained movie. If the movie includes the audio, there's a problem in DVDSP.
If you are exporting to MPEG2 out of FCP, you must figure out a way to check the audio portion of the file.
If it goes away in Simulator there's an issue happening right at that point. Does it play in the DVDSP timeline? Does it play in the media viewer of DVDSP? Can you open the exported movie in QT Player?
Is there anything significant about the 49 second location?
bogiesan

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