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Review questions

1:What's the difference between the timebase and the project frame rate?
A1: The timebase specifies the time divisions in a project. The project frame rate specifies the final number of frames per second that are generated from the project. Movies with different frame rates can be generated from the same timebase; for example, you can export movies at 30, 15, and 10 frames per second from a timebase of 30.
2:Why is non-drop-frame timecode important for NTSC video?
A2: Counting NTSC frames using a timecode of 30 fps will cause an increasingly inaccurate program duration because of the difference between 30 fps and the NTSC frame rate of 29.97 fps. Drop-frame timecode ensures that the duration of NTSC video will be measured accurately.
3:How is interlaced display different from progressive scan?
A3: Interlacing, used by standard television monitors, displays a frame's scan lines in two alternating passes, known as fields. Progressive scan, employed by computer monitors, displays a frame's scan lines in one pass.
4:Why is data compression important?
A4: Without data compression, digital video and audio often produce a data rate too high for many computer systems to handle smoothly.
5:What's the difference between applying a mask and adjusting opacity?
A5: A mask, also known as a matte in video production, is a separate channel or file that indicates transparent or semitransparent areas within a frame. In Premiere, opacity specifies the transparency of an entire frame.
6:What is an EDL and why is it useful?
A6: An EDL is an Edit Decision List, or a list of edits specified by timecode. It's useful whenever you have to transfer your work to another editing system because it lets you re-create a program using the timecode on the original clips.

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