Operation Manual
Chapter 9: MPEG-4 Options and Settings
62 ViewCast
Tab
Description
computer when the media file resides on the remote computer.
Video Settings
Control the capture properties for the selected video device (Figure 86):
The Input field lists all input connectors available for the capture device.
The Signal field lists the various video standards the capture device
supports.
You can adjust capture properties such as proportion, video size, and
width/height using the provided fields.
Adjust additional capture properties of brightness, contrast, saturation, and
hue individually for each input source using the sliding bars.
When making such adjustments, verify your adjustments apply to the
selected input.
Otherwise, your adjustments apply to all the input sources listed.
These capture properties remain available regardless of whether the
encoder starts or remains idle.
Figure 86. MPEG-4 Video Settings
Gamma Corrections
Adjust the gamma of the incoming video.
Gamma refers to the response curve of video cameras/CRTs.
When you capture video with a camera, the camera response remains
deliberately nonlinear – it boosts low lumen values and compresses high
lumen values – based on two reasons:
(1) It increases the effective bandwidth in the low lumen range, where you
need it, at the expense of the high lumen range, where you need it less.
(2) It matches the response characteristics of TV sets and monitors.
The calibration specified in video standards matches the requirements of
cameras and TV sets in broadcast use.
— This usually, however, does not match the needs of computer-based
applications or the response curves of computer monitors.
— Therefore, you often need a correction inverse to the original bias and
you may want to tune for the characteristics of a particular monitor.
When you disable the gamma correction filters:
— Set the gamma correction value to exactly 1.00.
— The software-based gamma filter works in pass-through mode with no
effect on the video and no processing bandwidth use.