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doc/filters: note expr and eval mode support in overlay_cuda

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Commit 58c908cf94 added support for expressions for x and y parameters.
Also added was option to set eval frequency.
This commit is contained in:
Gyan Doshi 2021-07-21 13:08:13 +05:30
parent f9d5050d28
commit f614390ecc
1 changed files with 46 additions and 1 deletions
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doc/filters.texi
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@ -15910,9 +15910,54 @@ It accepts the following parameters:
@table @option
@item x
@item y
Set the x and y coordinates of the overlaid video on the main video.
Set expressions for the x and y coordinates of the overlaid video
on the main video.
They can contain the following parameters:
@table @option
@item main_w, W
@item main_h, H
The main input width and height.
@item overlay_w, w
@item overlay_h, h
The overlay input width and height.
@item x
@item y
The computed values for @var{x} and @var{y}. They are evaluated for
each new frame.
@item n
The ordinal index of the main input frame, starting from 0.
@item pos
The byte offset position in the file of the main input frame, NAN if unknown.
@item t
The timestamp of the main input frame, expressed in seconds, NAN if unknown.
@end table
Default value is "0" for both expressions.
@item eval
Set when the expressions for @option{x} and @option{y} are evaluated.
It accepts the following values:
@table @option
@item init
Evaluate expressions once during filter initialization or
when a command is processed.
@item frame
Evaluate expressions for each incoming frame
@end table
Default value is @option{frame}.
@item eof_action
See @ref{framesync}.