Grass Valley ProCoder 3 - Manual (Page 162)

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ProCoder 3
Codec Options
Click the ... button to access the codec options for the selected codec. Not all codecs
have options and some do not have modifiable parameters.
Bits / Pixel
Select the number of colors to reproduce in the output from the drop-down list. The
number of bits per pixel, also called the color depth determines the number of colors
that can be simultaneously reproduced. More bits per pixel allow for representation of
more colors. Some encoders only support certain color depths. The common options
are:
256 Colors (8 bits per
pixel) Up to 256 colors can be represented. This color depth is useful for
animations and other content with flat colors and little gradation.
32,768 Colors (16 bits
per pixel) Up to 32,768 colors can be represented. This is a good trade-off
between reproduction of color gradation and file size.
Millions of Colors (24
bits per pixel) Up to 16.7 million colors can be represented. Most photographic
image formats use 24 bits per pixel. This is often refered to as True
Color.
Millions of Colors (32
bits per pixel) Up to 16.7 million colors can be represented along with a 256-level
transparency value.
256 Grays (8 bits per
pixel) Up to 256 shades of gray can be represented. This is fine for video
that does not require color.
Spatial Quality
Determines the spatial compression for each frame in terms of the video quality.
Least provides the highest amount of compression but poorer image quality. Spatal
compression reduces the information size of each frame by eliminating redundant
information and/or discarding information. Best provides the least amount of
compression but results in larger output size.
Temporal Quality
Determines the temporal compression for successive frames in terms of the video
quality. Temporal compression eliminates redundant information from one frame to
the next. Least provides the highest amount of temporal compression but has poorer
image quality. Best provides the least amount of compression but results in larger
output size.
User define “key frame”
Enable this option to manually set the number of frames per keyframe instead of
letting the compressor determine the optimal keyframe interval.
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