Originally committed as revision 4309 to svn://svn.ffmpeg.org/ffmpeg/trunk
* An example watermark file is at
* http://engene.se/ffmpeg_watermark.gif
*
+ * Example usage:
+ * ffmpeg -i infile -vhook '/path/watermark.so -f wm.gif' 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.
+ *
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either