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doc/filters.texi: update overlay_vaapi documentation 

Signed-off-by: softworkz <softworkz@hotmail.com>
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softworkz 2022-10-31 06:20:07 +00:00 committed by Haihao Xiang
parent 00ce6f486b
commit e137d197b5
1 changed files with 40 additions and 11 deletions
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@ -26321,30 +26321,59 @@ It takes two inputs and has one output. The first input is the "main" video on w
The filter accepts the following options:
@table @option
@item x
Set the x coordinate of the overlaid video on the main video.
Default value is @code{0}.
@item y
Set the y coordinate of the overlaid video on the main video.
Default value is @code{0}.
Set expressions for the x and y coordinates of the overlaid video
on the main video.
Default value is "0" for both expressions.
@item w
Set the width of the overlaid video on the main video.
Default value is the width of input overlay video.
@item h
Set the height of the overlaid video on the main video.
Default value is the height of input overlay video.
Set expressions for the width and height the overlaid video
on the main video.
Default values are 'overlay_iw' for 'w' and 'overlay_ih*w/overlay_iw' for 'h'.
The expressions can contain the following parameters:
@table @option
@item main_w, W
@item main_h, H
The main input width and height.
@item overlay_iw
@item overlay_ih
The overlay input width and height.
@item overlay_w, w
@item overlay_h, h
The overlay output width and height.
@item overlay_x, x
@item overlay_y, y
Position of the overlay layer inside of main
@end table
@item alpha
Set transparency of overlaid video. Allowed range is 0.0 to 1.0.
Higher value means lower transparency.
Default value is @code{1.0}.
@item eof_action
See @ref{framesync}.
@item shortest
See @ref{framesync}.
@item repeatlast
See @ref{framesync}.
@end table
This filter also supports the @ref{framesync} options.
@subsection Examples
@itemize