MACROMEDIA FLASH 8-USING FLASH VIDEO ENCODER Use Manual page 19

To specify custom video encoding settings:
1. Select the file or files whose encoding settings you want to modify.
To select multiple files in the encoding list, Control-click (Windows) or Command-click
(Macintosh), or select File > Select All to select all files in the encoding queue.
2.
Click Settings (Edit > Encoding Settings).
The Flash Video Encoding Settings dialog box appears.
3. Click Advanced Settings.
4. The Advanced Flash Video Encoding Options are displayed.
The Encode Video checkbox is selected by default.
5.
Select a video codec with which to encode your content from the Video Codec pop-up
menu.
If you are authoring for Flash Player 7, select Sorenson Spark codec; if you are authoring
for Flash Player 8, select On2 VP6 codec.
6.
Select a frame rate. Flash Video Encoder uses the same frame rate as the source video by
default. If you need to alter the frame rate, be sure you understand how modifying the
frame rate affects the video quality. For more information, see
standards and terminology" on page
If you are modifying the encoding settings for a video clip that will be embedded
within a SWF file, the video frame rate must match that of the SWF file. For more
information, see "Embedding video in a SWF file" in the "Working with Video"
chapter of Using Flash.
7. Select the key frame placement for the video. Keyframes are video frames that contain
complete data. For example, if you specify a keyframe interval of 30, Flash Video Encoder
encodes a complete frame every 30 frames in the video clip. For frames between keyframe
intervals, Flash stores only the data that changes from the preceding frame.
By default, Flash Video encoder places a keyframe every 2 seconds of playback time. For
example, if the video you're encoding has a frame rate of 30 fps, a keyframe will be
inserted every 60 frames. In general, the default keyframe value provides a reasonable level
of control when seeking within a video clip. If you need to select a custom keyframe
placement value, be aware that the smaller the keyframe interval, the larger the file size.
8.
Selecting advanced video encoding settings
"Understanding video
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