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Rendering and Exporting
Last updated 12/12/2014
You render and export a movie to the FLV or F4V container format using the render queue, just as you do with other
formats. (See
Render and export a movie using the render queue.)
To include the alpha channel in the FLV output, use the On2 VP6 codec and select Encode Alpha Channel in the Video
tab of the export settings dialog box. After Effects premultiplies channels with black when encoding transparency in
FLV files. (See
Alpha channel interpretation: premultiplied or straight.)
When you render and export a composition to the F4V or FLV format from a 32-bpc project, the rendering of colors
with values under 0 and over 1 does not produce results that preserve the appearance of the composition in After
Effects. To avoid unexpected results, you can work in an 8-bpc or 16-bpc project when creating a composition that you
intend to render and export to F4V or FLV format. Alternatively, you can work in a 32-bpc project, render and export
the composition to another format, and then convert the output file to F4V or FLV.
Online resources about FLV and F4V formats
This video from the After Effects CS5: Learn By Video series demonstrates export to FLV and F4V formats.
Jan Ozer provides technical details and tips in “Encoding options for H.264 video” on the Adobe Developer Connection
website for encoding video using the H.264 video codec.
Kush Amerasinghe provides an overview of H.264 and F4V in “H.264 for the rest of us“ on the Adobe Developer
Connection website.
Robert Reinhardt provides information about video for Flash Player in some sample chapters from his book Video with
Adobe Flash CS4 Professional Studio Techniques on the Peachpit website. In the
"Compression primer" chapter, he
explains in detail the advantages and disadvantages of the On2 VP6 and H.264 video codecs.
More information about FLV and F4V formats—including the F4V specification—is available on the Adobe Developer
Connection website.
Fabio Sonnati provides recommendations for settings for H.264 (F4V) movies for mobile devices on the Adobe
Developer Connection website.
More Help topics
Working with Flash and After Effects
Basics of rendering and exporting
Encoding and compression options for movies
Converting movies
Convert footage items between video formats
You can use After Effects to convert one kind of video to another. When converting video, keep in mind the following
guidelines:
Changes in resolution may result in a loss of picture clarity, especially when up-converting from a standard-
definition format to a high-definition format.
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