[Cin] selectable vaapi decoder device

Andrea paz gamberucci.andrea at gmail.com
Tue Aug 29 14:45:09 CEST 2023


Good plugin; thanks.
I append manual plugins.tex, image and mirror.txt, for those who want
to read the description but don't have latex. Please propose
corrections and improvements, thank you.
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Mirror does more than simply flip (or reflect) the frame. It divides the frame into two vertical and/or horizontal half-planes, allowing them to be translated and oriented to achieve complex reflections and compositions, which can be reminiscent of kaleidoscope.

Horizontal: composes a reflection of the right half-plane joined to the left half-plane. The axis of reflection is central and vertical (Reflection Center). It can be used together with Vertical to have 4 half-planes of reflection.
Swap LEFT-RIGHT side: Swaps the two horizontal reflection half-planes, reversing their orientation. If this option is enabled, Enable Reflection Center is disabled.
Vertical: composes a reflection of the top half-plane joined to the bottom half-plane. The axis of reflection is central and horizontal (Reflection Center). It can be used together with Horizontal to have 4 half-planes of reflection.
Swap TOP-BOTTOM side: Swaps the two vertical reflection half-planes, reversing their orientation. If this option is enabled, Enable Reflection Center is disabled.
Enable Reflection Center: allows shifting the half-plane along the X-axis and/or along the Y-axis, relative to the Reflection Center. You can enter the percentage value or act on the slider for a visual adjustment. Checking this option excludes the use of swap functions.
Reset: returns all values to the initial conditions i.e., with only the Horizontal button enabled.

An example of horizontal + vertical reflection without Swap nor shifting of the center of reflection is shown in the figure
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