MACROMEDIA FLASH 8-USING FLASH Use Manual page 279

The following video file formats are supported for importing embedded video if DirectX 9 or
later is installed (Windows only):
File type
Audio Video Interleaved
Motion Picture Experts Group
Windows Media file
By default, Flash imports and exports video using the On2 VP 6 codec. A codec is a
compression/decompression algorithm that controls how multimedia files are compressed
during encoding, and decompressed during playback. For information on the On2 VP 6
video codec, see "About the On2 VP6 and Sorenson Spark video codecs" on page
If you attempt to import a file format that is not supported on your system, a warning
message is displayed indicating that the operation cannot be completed. In some cases, Flash
might import the video but not the audio in a file. For example, audio is not supported in
MPG/MPEG files imported with QuickTime 7 on the Macintosh. In such cases, Flash
displays a warning indicating that the audio portion of the file cannot be imported. You can
still import the video without sound. For more information on audio support in MPEG
video, see "About audio support for MPEG video" on page
About audio support for MPEG video
Because MPEG encodes both the video and audio portions of a file into a single track,
encoding MPEG files as FLV files may result in the audio portion being removed (or
"dropped"). This occurs primarily when encoding video files into FLV format on the
Macintosh platform. On the Macintosh, MPEG video is imported using QuickTime.
QuickTime does not support extracting audio content from MPEG files (although
QuickTime will correctly play back an MPEG file with audio programming).
If you are encoding MPEG video with audio on a Macintosh, it is recommended that you first
convert the MPEG video clip into another format that encodes audio and video as separate
tracks within the file. You can then encode the other format as an FLV file, and preserve the
audio content.
Extension
.avi
.mpg, .mpeg
.wmv, .asf
279.
About digital video and Flash
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