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HD Video Encoders · User Manual
6.3 Video & Audio adjustments
6.3.1 Video source choice and adjustments
Users can choose video source, adjust brightness, contrast, saturation and hue parameters of the video
here.
“Auto Selection” means the device will check each video source and automatically select the one which
has signal.
“Auto Selection (one-shot)”same as “Auto Selection” but once it selected a source, it 'lock' this and
never change unless you 'Quick Reset' or 'Reboot' the device!
The value range of Brightness, Contrast, Saturation and Hue is 0~255, default is 128. Based on the
median value, the increase/decrease value corresponds to the increase/decrease in
brightness/contrast/saturation. The default value of Hue is 128, which represents phase 0; the value
range is 0-255.
6.3.2 Video preprocessing
Before video captured and sent to encoder, we can make some necessary preprocessing:
(1) Source picture cropping: Crop a part of the original picture for encoding.
(2) Scaling: After step 1 cropping (or not cropping), video can be scaled up/down to certain format. (E.g.
Input video is 1080p60, scaling down to 720p30 for encoding.)
(3) Second cropping: After the step 2, you can continue cropping the size you want for encoding. (It’s
almost the same with step 1, but necessary in specific application.)
(4) Rotation or flipping: It's the last step before encoding, you can rotate the video with 90/180/270
degrees, horizontal mirror or vertical flip.
Above process is a pipeline from step 1 to step 4. You could choose to open, or prohibit it about each
step.
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