ADOBE PREMIERE PRO 2.0
User Guide
390
Windows Media
One of Microsoft’s multimedia architectures that includes a number of codecs, particularly those
for web delivery. The Adobe Media Encoder Export Settings dialog box is useful for setting options for Windows
Media streaming media codecs.
Note:
For more detailed information about each format, see the developer’s website.
See also
“Understanding video file formats” on page 372
Adobe Media Encoder Filters options
Noise, grain, and similar artifacts can interfere with the efficient compression of images. For this reason, the size of
the final output file may in some cases be reduced by applying a noise reduction filter to an image or movie before
compression takes place.
In the Export Settings dialog box, you can specify whether to apply a noise reduction filter before compression, and
you can also set the amount of noise filtering to apply.
If you intend to remove noise and grain from your project for reasons other than reduction of compressed file size,
consider using the Noise & Grain effects in Adobe Premiere Pro or After Effects.
Adobe Media Encoder Video options
The options available in the Adobe Media Encoder Video tab depend on the format you specify in the Export
Settings area. Video settings include some or all of the following options:
Codec
Specifies the codec used to encode the video from those available on your system. The term
codec
is derived
from
compressor/decompressor
and
coder/decoder
.
Quality
Specifies the encoding quality. Generally, higher values increase rendering time and file size.
TV Standard
Conforms the output to the NTSC or PAL standard.
Frame Width
Scales the output frame’s horizontal aspect to the specified width.
Frame Height
Scales the output frame’s vertical aspect to the specified height.
Frame Rate
The output frame rate for either NTSC or PAL formats.
Field Order
Specifies whether the output file’s frames are interlaced, and if so, whether the upper or lower field is first
in the scanning order. (See “About interlaced and noninterlaced video” on page 129.)
Pixel Aspect Ratio
Specifies the ratio of each pixel’s width to height, which determines the number of pixels required
to achieve a given image aspect ratio. Some formats use square pixels, while others use nonsquare pixels.
Bitrate Encoding
Specifies whether the codec achieves a constant or variable bitrate in the exported file:
•
Constant Bit Rate (CBR)
Compresses each frame in the source video to the fixed limit you specify, producing a file
with a fixed data rate. Therefore, frames containing more complex data are compressed more, while less complex
frames are compressed less.
•
Variable Bit Rate (VBR)
Allows the exported file’s data rate to vary within a range you specify. Because a given
amount of compression degrades the quality of a complex image more than it degrades the quality of a simple image,
VBR encoding compresses complex frames less and compresses simple frames more.
In general, an image is complex and more difficult to compress efficiently if it contains great detail or if it differs
significantly from previous frames, as it would in a scene containing motion.