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documenting cropdetect's parameter

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@6809 b3059339-0415-0410-9bf9-f77b7e298cf2
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arpi 2002-07-26 00:12:13 +00:00
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DOCS/tech/vop.txt
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@ -129,10 +129,13 @@ Current plugins:
-vop lavc,expand=-1:576:-1:-1:1,scale=-1:0,dvbscale
MPI: passthru
-vop cropdetect
-vop cropdetect[=limit]
It's a special filter, it doesn't alter the image itself, but detects
(using some kind of heuristics) the black borders/bands of the image,
and prints the optimal -vop crop= parameters to the stdout/console.
It calculates the average value of pixel luminances for a line, and
depending on the result it's either black band (result<=limit) or
picture (result>limit). Optional parameter 'limit' defaults to 24.
MPI: EXPORT
-vop test[=first frame number]