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spelling/grammar fixes

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Originally committed as revision 6757 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Diego Biurrun 2006-10-22 12:12:44 +00:00
parent 7c7e7464e3
commit 8dfcf67e88
1 changed files with 11 additions and 11 deletions
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22
vhook/watermark.c
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@ -2,39 +2,39 @@
* Watermark Hook
* Copyright (c) 2005 Marcus Engene myfirstname(at)mylastname.se
*
* flags to watermark:
* parameters for watermark:
* -m nbr = nbr is 0..1. 0 is the default mode, see below.
* -t nbr = nbr is six digit hex. Threshold.
* -f file = File is the filename of watermark image. You must specify this!
* -f file = file is the watermark image filename. You must specify this!
*
* MODE 0:
* The watermarkpicture works like this. (Assuming colorintencities 0..0xff)
* The watermark picture works like this (assuming color intensities 0..0xff):
* Per color do this:
* If mask color is 0x80, no change to original frame.
* If mask color is < 0x80 the abs difference is subtracted from frame. If
* If mask color is 0x80, no change to the original frame.
* If mask color is < 0x80 the abs difference is subtracted from the frame. If
* result < 0, result = 0
* If mask color is > 0x80 the abs difference is added to frame. If result
* If mask color is > 0x80 the abs difference is added to the frame. If result
* > 0xff, result = 0xff
*
* You can override the 0x80 level with the -t flag. Eg if threshold is 000000
* the color values of watermark is added to destination.
* You can override the 0x80 level with the -t flag. E.g. if threshold is
* 000000 the color value of watermark is added to the destination.
*
* This way a mask that is visible both in light pictures and in dark can be
* made (fex by using a picture generated by gimp and the bump map tool).
* made (fex by using a picture generated by Gimp and the bump map tool).
*
* An example watermark file is at
* http://engene.se/ffmpeg_watermark.gif
*
* MODE 1:
* Per color do this:
* If mask color > threshold color, watermark pixel is going to be used.
* If mask color > threshold color then the watermark pixel is used.
*
* Example usage:
* ffmpeg -i infile -vhook '/path/watermark.so -f wm.gif' -an out.mov
* ffmpeg -i infile -vhook '/path/watermark.so -f wm.gif -m 1 -t 222222' -an out.mov
*
* Note that the entire vhook argument is encapsulated in ''. This
* way, arguments to the vhook won't be mixed up with those to ffmpeg.
* way, arguments to the vhook won't be mixed up with those for ffmpeg.
*
* This file is part of FFmpeg.
*