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.

CAUTION

Only Flash Player 8 supports both publish and playback of On2 VP6 video.

Codec	Content (SWF) version (publish version)	Flash Player version (version required for playback)
Sorenson Spark	6	6, 7, 8
	7	7, 8
On2 VP6	6	8
	7	8
	8	8

Version 8

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Current page: http://livedocs.adobe.com/flash/8/main/00000646.html