QuickTime 4 Reference

Movie Capture

During data storage, such as the capture of video and sound into a movie file, a a sequence grabber component isolates your application from the details of how to capture the raw data from a particular device. Therefore, during movie capture you do not have to directly use data handler components in your application. The storage of your data will be taken care of for you by the sequence grabber component you call. If, however, you are storing data onto a non-Macintosh or proprietary storage medium, or multiple storage media, you might need to write your own data handler.

The sequence grabber component calls the appropriate channel component, such as a video, sound, or text channel component, to retrieve the raw data from an input device, such as a microphone.