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Adobe After Effects CC 2013 Manual

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Audio Output
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frame. Select Low Resize Quality when rendering tests, and select High Resize Quality when creating a final movie. (See Scaling a movie down
and Scaling a movie up.)
Used to subtract or add rows or columns of pixels to the edges of the output movie. You can specify the number of rows or columns of
pixels to be added or subtracted from the top, left, bottom, and right sides of the movie. Use positive values to crop, and use negative values to
add rows or columns of pixels. Select Region Of Interest to export only the region of interest selected in the Composition or Layer panel. (See
Region of interest (ROI).)
By adding one row of pixels to the top and subtracting one row from the bottom of a movie, you can change the field order.
Specifies the sample rate, sample depth (8 Bits or 16 Bits), and playback format (Mono or Stereo). Choose a sample rate that
corresponds to the capability of the output format. Choose an 8-bit sample depth for playback on the computer, and a 16-bit sample depth for CD
and digital audio playback or for hardware that supports 16-bit playback.
The specifications for some formats impose limits on audio parameters. In such cases, audio options may be unavailable for modification in
the Output Module Settings dialog box. Also, audio options for some formats are set in the export settings dialog box for that format. For example,
to set audio output options for Windows Media, click Format Options in the Output Module Settings dialog box.
Warning for mismatch in frame rate or dimensions
Some formats (for example, the Blu-ray formats) enforce constraints on frame dimensions and frame rate.
If you choose such a constrained output format, and your composition, its render settings, or its output module settings don’t match the constraints,
then After Effects shows a yellow warning icon
and the message “Settings mismatch” at the bottom of the Output Module Settings dialog box.
Click the warning icon to see a detailed message that describes how the output file will be modified to meet the format constraints. You can go
back and change composition settings, render settings, and output module settings if you don't want After Effects to make the changes
automatically in the output module.
For more information about output module constraints and the warnings for mismatches in frame rate, dimensions, and pixel aspect ratio, see the
Adobe website.
Encoding and compression options for movies
Compression is essential for reducing the size of movies so that they can be stored, transmitted, and played back effectively. Compression is
achieved by an encoder; decompression is achieved by a decoder. Encoders and decoders are known by the common term codec. No single
codec or set of settings is best for all situations. For example, the best codec for compressing cartoon animation is generally not efficient for
compressing live-action video. Similarly, the best codec for playback over a slow network connection is generally not the best codec for an
intermediate stage in a production workflow. For information on planning your work with final output in mind, see Planning your work.
For more information about encoding and compression options, see "FAQ: What is the best format for rendering and exporting from After
Effects?".
After Effects uses an embedded version of the Adobe Media Encoder to encode most movie formats through the Render Queue panel. When you
manage render and export operations with the Render Queue panel, the embedded version of the Adobe Media Encoder is called automatically.
The Adobe Media Encoder appears only in the form of the export settings dialog boxes with which you specify some encoding and output settings.
The embedded version of the Adobe Media Encoder used to manage export settings within After Effects output modules does not provide
all of the features of the full, stand-alone Adobe Media Encoder application. For information about the full, stand-alone Adobe Media Encoder
application, see Adobe Media Encoder Help.
For most output formats, you can specify format-specific encoding and compression options. In many cases, a dialog box opens and presents
these options when you choose a format to export to or click the Format Options button in the Output Module settings dialog box. (See Output
modules and output module settings.)
In After Effects CS7, formats like H.264, MPEG-2, and WMV have been removed from the Render Queue because Adobe Media Encoder gives
better results. Use Adobe Media Encoder instead. For details see The Adobe Media Encoder.
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