MACROMEDIA FLASH MX 2004-USING FLASH Use Manual page 184

Selecting compression profiles in the Video Import wizard
The Video Import wizard provides several options for compressing a video clip during the import
process. In the Encoding panel, you can enter a value for Bandwidth or Quality, control the
frequency of keyframes, ensure consistent image quality in keyframes, increase encoding speed,
and match the playback speed of the imported video to the playback speed of the main Flash
document Timeline.
You select a compression profile to select the level of compression that will be applied to the
imported embedded video. You can select a profile based on bandwidth or video quality.
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Custom bandwidth options range from 0 to 750 Kbps and specify the approximate download
speed, in kilobits per second, for the video. Preset options include 56 Kbps modem, 256 Kbps,
512 Kbps, and 786 Kbps on DSL or cable. The quality setting of individual frames can vary to
achieve a consistent download speed.
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Video quality settings, which range from 0 to 100, specify a compression level for all frames.
You can also specify a keyframe rate. The download speed can vary to achieve a consistent
compression level.
To reduce the time it takes to compress a file, you can select Quick Compress.
You can synchronize the frame rate of an embedded video to match the frame rate of the main
Timeline. You can also adjust the ratio of the video frame rate to the main Timeline frame rate, to
drop frames from the imported video during playback.
In some situations, you might not want to synchronize the embedded video with the SFW file.
Instead, you want to prevent frames in the embedded video from being dropped or duplicated.
For example, suppose you want to import an NTSC video clip with a frame rate of 29.97 fps into
a Flash document with a frame rate of 30 fps. Deselecting the Synchronize option keeps frames
from being dropped in the embedded video and prevents the hiccup effect that this causes during
playback.
You can save customized compression profiles as named settings. The new settings appear in the
Compression Profile pop-up menu.
To create a custom compression profile:
From the Compression Profile pop-up menu in the Encoding panel, select Create New Profile
1.
or a predefined compression rate and click Edit.
Do one of the following:
2.
Select Bandwidth and drag the slider or enter a Bandwidth value between 0 and 750 Kbps.
Bandwidth options specify the approximate download speed, in kilobits per second, for the
video. The quality setting of individual frames can vary to achieve a consistent download
speed.
Select Quality, and drag the slider or enter a quality value between 0 and 100. Quality
options specify a compression level for all frames. Higher values produce better images but
increase download time. The download speed can vary to achieve a consistent compression
level.
184 Chapter 10: Working with Video