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Note: Some TriCaster features do not provide full functionality for some of the alternate
formats. For example, certain of the formats do not support embedded timecode.
Let’s consider TriCaster’s two MPEG-2 formats first.
MPEG-2
TriCaster’s ‘double-rate’ MPEG-2 format for capture is
comprised entirely of ‘I-frames’, resulting in excellent
image quality. Two variants are provided; the choice
principally affects color sampling applied to captured
clips.
MPEG-2 Compatibility encoding invokes 4:2:0
color sampling (similar to that of the popular ‘DV’
and ‘HDV’ formats).
MPEG-2 High Profile encoding raises color
sampling to 4:2:2. These files retain more color
information than standard DV/HDV files as well as
many other file formats. The increased color
fidelity is especially valuable for chromakeying
purposes. (Please see the notes which follow
regarding file compatibility.)
The 4:2:2 sampling and high fidelity of the MPEG-2 High Profile format make it
especially suitable for chromakeying applications.
Support for High Profile MPEG-2 files by various applications is not universal,
however. It would be prudent to test file compatibility with your favorite third-party
programs before making extensive use of this option.
Note: TriCaster’s High Profile MPEG-2 files meet the “High Profile” MPEG-2 definition
established by the Moving Pictures Expert Group (MPEG). Please see
http://en.wikipedia.org/wiki/Mpeg2 for more detailed information on High Profile MPEG-2
encoding.
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