What's New in QuickTime 5
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Some performance implications occur when dealing with implementations that have latency. Notably, starting and stopping a movie requires extra time since the media's timebases will start before the movie timebase. When latency is present, an application should avoid setting the movies rate directly from positive to negative without going through zero first, since otherwise the latency will not be correctly taken into account (and video and sound will not be synchronized thereafter).
A limitation in the current implementation is that QuickTime does not support mixing different video latencies between different codecs. This limitation is within QuickTime and cannot be overcome by the codecs. Applications should avoid creating movies that mix multiple types of video codecs if the codecs have different latencies.
What's New in QuickTime 5
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