Macromedia flash 8-using flash video encoder Manual De Usuario
Supported video compression codecs for Flash Video
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The following video-editing applications are supported by the QuickTime Export plug-in:
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Adobe After Effects (Windows and Macintosh)
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Apple FinalCut Pro (Macintosh)
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Apple QuickTime Pro (Windows and Macintosh)
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Avid Xpress DV (Windows and Macintosh)
Exporting FLV files from either Flash 8 Video Encoder or video-editing applications using the
QuickTime Export plug-in significantly streamlines the workflow in using FLV files in your
Flash documents. With the QuickTime Export plug-in, you can select encoding options for
video and audio content as you export, including frame rate, bit rate, quality, and other
options. You can import FLV files directly into Flash without needing to re-encode the video
after you import them.
QuickTime Export plug-in significantly streamlines the workflow in using FLV files in your
Flash documents. With the QuickTime Export plug-in, you can select encoding options for
video and audio content as you export, including frame rate, bit rate, quality, and other
options. You can import FLV files directly into Flash without needing to re-encode the video
after you import them.
Supported video compression codecs for
Flash Video
Flash Video
By default, Flash Video Encoder encodes video using the On2 VP6 codec for use with Flash
Player 8 and the Sorenson Spark codec for use with Flash Player 7. To understand how Flash
achieves high-quality video with low bandwidth requirements, you should understand video
compression.
Player 8 and the Sorenson Spark codec for use with Flash Player 7. To understand how Flash
achieves high-quality video with low bandwidth requirements, you should understand video
compression.
There are two types of compression that can be applied to digital media: spatial and temporal.
Spatial compression is applied to a single frame of data, independent of any surrounding
frames. Spatial compression can be lossless (in which no data is discarded from the image) or
lossy (in which data is selectively discarded). A spatially compressed frame is often called an
intraframe.
Spatial compression is applied to a single frame of data, independent of any surrounding
frames. Spatial compression can be lossless (in which no data is discarded from the image) or
lossy (in which data is selectively discarded). A spatially compressed frame is often called an
intraframe.
Temporal compression identifies the differences between frames and stores only those
differences, so that frames are described based on their difference from the preceding frame.
Unchanged areas are simply repeated from the previous frame(s). A temporally compressed
frame is often called an interframe.
differences, so that frames are described based on their difference from the preceding frame.
Unchanged areas are simply repeated from the previous frame(s). A temporally compressed
frame is often called an interframe.
Both the On2 VP6 and Sorenson Spark are interframe codecs. Although many other codecs
use intraframe compression (for example, JPEG is an intraframe codec), the efficient
interframe compression of the On2 VP6 and Sorenson Spark codecs, among other features,
distinguishes them from other compression technologies because these codecs require a much
lower data rate (also known as the bit rate) to produce high-quality video.
use intraframe compression (for example, JPEG is an intraframe codec), the efficient
interframe compression of the On2 VP6 and Sorenson Spark codecs, among other features,
distinguishes them from other compression technologies because these codecs require a much
lower data rate (also known as the bit rate) to produce high-quality video.
NO
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Avid Xpress DV does not support the encoding of an alpha channel when you use it
to export to the FLV video format.
to export to the FLV video format.
000_FLVEncoder.book Page 7 Friday, August 12, 2005 3:50 PM