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doc/filters: create a dedicated "Examples" subsection for fade, and use @itemize

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Stefano Sabatini 2013-01-18 19:00:35 +01:00
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doc/filters.texi
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@ -2303,23 +2303,43 @@ If set to 1, fade only alpha channel, if one exists on the input.
Default value is 0. Default value is 0.
@end table @end table
A few usage examples follow, usable too as test scenarios. @subsection Examples
@itemize
@item
Fade in first 30 frames of video:
@example @example
# fade in first 30 frames of video
fade=in:0:30 fade=in:0:30
@end example
# fade out last 45 frames of a 200-frame video The command above is equivalent to:
@example
fade=t=in:s=0:n=30
@end example
@item
Fade out last 45 frames of a 200-frame video:
@example
fade=out:155:45 fade=out:155:45
@end example
# fade in first 25 frames and fade out last 25 frames of a 1000-frame video @item
Fade in first 25 frames and fade out last 25 frames of a 1000-frame video:
@example
fade=in:0:25, fade=out:975:25 fade=in:0:25, fade=out:975:25
@end example
# make first 5 frames black, then fade in from frame 5-24 @item
Make first 5 frames black, then fade in from frame 5-24:
@example
fade=in:5:20 fade=in:5:20
@end example
# fade in alpha over first 25 frames of video @item
Fade in alpha over first 25 frames of video:
@example
fade=in:0:25:alpha=1 fade=in:0:25:alpha=1
@end example @end example
@end itemize
@section field @section field