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I've never seen, or heard, this before. It could be a codec, data rate,
or memory problem. Some codecs work better than others when working with
files that will be played as segments. I've always had flawless playback
similar to what you are doing by using Sorenson 2 and either of the
Qualcomm audio compressors.
It may be that your video compressor is set to too high a data rate and
that the video is forcing the audio out at points in the playback. A
lower data rate may solve the problem. You may also be using all of the
available memory. Have you tried looking at the memory inspector while
running in authoring, if you're on Windows?
Adobe Community Expert
Thanks for the advice. I'm using the H264 codec to encode the Quicktime movies. I have found this fix which has worked for me:
On the PC sound will at times cut out on playback prematurely. One solution is to add 2-3 seconds of silence at the end but this is sometimes not feasible. The problem stems from the way the windows sound devices see the end of a sound file in Director. TO get around this make sure QuickTime is installed on the end user's machine and then set the soundDevice to QT3Mix...
the soundDevice = "QT3Mix"