What's New in QuickTime 5
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QuickTime 5 has defined new APIs to retrieve the video and sound latencies from Video Codecs and Sound Output Components.
The latency values are used to separately offset the timebases of the video and/or sound media from that of the movie timebase. The offsets are based on pipeline delays within the implementation of the sound or video components. For example, given some video hardware that has several stages that will take five frames to go through between the start of decompression and when the data is displayed, the video codec should report a latency of five frames, so that QuickTime will schedule the frames in advance. The codec is responsible for reporting a latency that represents its accurate pipeline in order to maintain audio and video synchronization.
What's New in QuickTime 5
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