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Tom Wolsky's definition is very helpful.
"I'm not clear what your question is, why is QuickTime better than DV Stream?
QuickTime is an architecture that allows you to access the content of multi-track digital media. DV Stream is a multiplexed file, video, audio, timecode and metadata are thrown together into one stream. That's the way the camera records it. If you work with DV Stream it becomes difficult to access audio, hence the many silly tricks you have to go through to do things with sound in iMovie. The tracks only get demuxed when you manually tell it to. The worst part is that the application never accesses the timecode data, just the silly time of day data. Without the timecode no project is ever recreatable without basically doing it from memory and guessing.
Turning the DV data into QuickTime at capture allows you to do a great many things with the different tracks, you have TC embedded in the tracks, you have separate, discreet channels of audio, and of course a separate video track that you can move completely independently of the video at the press of a key. QuickTime allows for greater flexibility and creativity and ease of use in your work.
You can hear the audio during capture, you just should monitor it from a different place, not from your computer but from the camera or deck that's playing it back.
All the best,
Tom"
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