MACROMEDIA FLASH 8-USING FLASH Use Manual page 280

Another alternative is to use a computer with the Windows operating system. Windows
imports MPEG video using DirectShow, which supports extracting both the video and audio
tracks of an MPEG file. This lets you convert MPEG video to the FLV format without
removing the audio portion of the video clip.
Imported audio is published or exported as streamed audio, using the global audio
streaming settings selected in the Publish Settings dialog box. For more information, see
"Setting publish options for the Flash SWF file format" on page
About the On2 VP6 and Sorenson Spark video
codecs
By default, Flash Video Encoder exports encoded video using the On2 VP6 video codec for
use with Flash Player 8, and the Sorenson Spark codec for use with Flash Player 7. A codec is a
compression/decompression algorithm that controls how video files are compressed during
encoding, and decompressed during playback. The On2 video codec is the preferred video
codec to use when creating Flash content that uses video. On2 provides the best combination
of video quality while maintaining a small file size.
If your Flash content dynamically loads Flash video (using either progressive download or
Flash Communication Server), you can use On2 VP6 video without having to republish your
SWF for Flash Player 8, as long as users use Flash Player 8 to view your content. By streaming
or downloading On2 VP6 video into Flash SWF versions 6 or 7, and playing the content
using Flash Player 8, you avoid having to recreate your SWF files for use with Flash Player 8.
Only Flash Player 8 supports both publish and playback of On2 VP6 video.
Codec
Sorenson Spark
On2 VP6
280 Working with Video
Content (SWF) version
(publish version)
6
7
6
7
8
461.
Flash Player version
(version required for
playback)
6, 7, 8
7, 8
8
8
8