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By looking at the analysis graph, you can pinpoint peaks in the graph which
would benefit most from being key frames. For more on understanding key
frames and compression, see the Appendix, page 393.
To edit the key frames on the data rate analysis graph:
Select the frame you want to make or remove using the Key frame
1.
Controller beneath the Preview window.
To make a key frame, click the Add Key frame
2.
button. A key frame is placed on the Key frame
track and the frame in the data rate graph
changes to blue. To remove a key frame, click
the Remove Key frame button. The respective
key frame disappears from the Key frame track
and the frame changes to gray. To return a clip
to its original settings click Restore.
Note: Removing a key frame doesn't remove the frame itself, it only removes the
reference to that frame as a key frame.
Click Save As to save the new key frame information to a Key file
3.
(*.KEY). To apply the key file, you need to re-render the video file
again, making sure you specify the key file in the Key frame control
group box in the Video Editor tab of the Video Save Options dialog
box (see page 219).
Note: Not all compression schemes will follow the key file, and those that do, such as
Cinepak, may still insert key frames wherever they determine there is a need. This is
out of the control of Video Editor and in the hands of the compression scheme itself.
Therefore, you may sometimes find that removing key frames does not change your
video appreciably in your next analysis.
MEDIASTUDIO PRO USER GUIDE
Data rate analysis graph
Preview window with key
frame controller
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