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164 VIDEO EDITOR
Analyzing a video file's data rate
In Video Editor, you can analyze a video file and view a graphical representation of
the data flow for the entire sequence. This provides detailed information about the
file and its data rate. This information can be used to target high data rate areas
for more compression using key frames.
To perform a data rate analysis:
1. Click File: Data Rate Analysis to open the Data Rate Analysis dialog box.
2. Browse for and select the video file that you want to analyze and then click
Analysis.
Data Rate Analysis dialog box
The Data Rate Analysis window details the various attributes of the file and
shows a graph indicating the size of each frame in the video. This graph contains a
number of blue frames which indicate key frames in the video sequence (key
frame diamonds are also visible beneath the Preview window). For some video
compression schemes (such as Cinepak), you can control these key frames and
arrange their order so that you get the maximum benefit out of compression.
By looking at the analysis graph, you can pinpoint peaks in the graph which would
benefit most from being key frames.
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