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CHAPTER 3 128
Preparing and Importing Source Clips
The Properties feature provides detailed information about any clip. For video files, analyzed
properties can include the file size, number of video and audio tracks, duration, average frame,
audio and data rates, and compression settings. You can also use Properties to alert you to the
presence of any dropped frames in a clip you just captured. For information about dropped
frames, see “Preserving quality and performance during video capture” on page 359.
To see the properties of a clip:
1
Do one of the following:
•
If the clip is in the Project, Monitor, or Timeline window, select it and choose File > Get
Properties For and select the filename of the clip.
•
If the clip is not yet in the project, choose File > Get Properties For > File. Locate and select
the clip you want to analyze, and then click Open.
2 To save the Properties window text as a text file, choose File > Save As, specify a location and
filename, and click Save.
3 To see the Data Rate Graph, click Data Rate.
Use the data rate graph to evaluate how well the output data rate matches the requirements
of your delivery medium. It charts each frame of a video file to show you the key frame rate,
the difference between key frames and differenced frames (frames that exist between key
frames), and data rate levels at each frame. For information about key frames, differenced
frames, and data rates, see Appendix B, “Compressing video and audio.” The Data Rate
Graph includes the following:
•
Data rate, the white line represents the average data rate.
•
Key frame sample size, the red bars represent the sample size of each key frame.
•
Differenced frames sample size, the blue bars represents the sample size of the differenced
frames between key frames.
4
When you are finished, close the Data Rate Graph window and the Properties window.
You can also view clip properties from a window containing a clip by right-clicking a clip
(Windows) or pressing Control as you click a clip (Mac OS) and choosing Get Properties.
c00.book for PS Page 128 Tuesday, March 31, 1998 1:28 PM