Which of the following would NOT be considered metadata?

The correct choice points to the specific characteristics of clip duration. In the context of video editing and media management, metadata typically refers to data that provides information about other data. Examples of metadata include attributes like frame rate, camera used, and file format, all of which describe the properties and specifications of the video or audio files.

Clip duration, however, is a measurement of the actual length of the clip in a timeline, indicating how long the media plays. While it relates to the content, it does not provide additional descriptive information about the media's characteristics or its technical properties. Instead, it is a direct property of the media itself rather than metadata.

Thus, the other options—frame rate, camera used, and file format—are all technical descriptors that give context and details about how the media was created and how it should be interpreted or processed, qualifying them as metadata.