ROI(Region of interest coding quality control)
A. This function can be used to improve the coding quality of key areas and subjective visual perception at low bit rate.
B. Only one area of interest is supported on the interface, and developers can try up to eight areas of interest.
C. Like the “Overlay” page, you need to select the appropriate channel at the top of the preview screen before setting the parameters.
Enable: Enable or disable ROI
ABS QP: Enables or disables absolute QP. For details, see QP parameter description below
QP: When absolute QP is enabled, the coding QP of the selected area remains QP. When absolute QP is turned off, the encoding QP of the selected region is set to QP for the current QP+, so setting negative values can improve the encoding quality of the selection, and reduce it otherwise.
Bg framerate: -1 indicates that the frame rate outside the selection does not change. If the value is greater than 0, the background frame rate is a set value.
Note: the preview screen is only used to aid selection, and the changes in coding quality and frame rate are not reflected in the preview image.