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doc/filter: add some loop filter trivial examples

Paul B Mahol authored on 2018/11/01 21:50:51
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@@ -11379,6 +11379,28 @@ Set maximal size in number of frames. Default is 0.
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 Set first frame of loop. Default is 0.
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 @end table
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+@subsection Examples
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+
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+@itemize
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+@item
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+Loop single first frame infinitely:
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+@example
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+loop=loop=-1:size=1:start=0
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+@end example
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+
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+@item
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+Loop single first frame 10 times:
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+@example
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+loop=loop=10:size=1:start=0
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+@end example
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+
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+@item
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+Loop 10 first frames 5 times:
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+@example
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+loop=loop=5:size=10:start=0
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+@end example
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+@end itemize
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+
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 @section lut1d
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 Apply a 1D LUT to an input video.