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doc/filters: add drawtext example 

Show example which draws text at a random position, and switches positions every 30 seconds

Signed-off-by: Mulvya <mulvya@gmail.com>
Signed-off-by: Lou Logan <lou@lrcd.com>
This commit is contained in:
Mulvya 2016-04-03 14:27:01 +05:30 committed by Lou Logan
parent 3a9611d623
commit b7a776aa7b
1 changed files with 6 additions and 0 deletions
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doc/filters.texi
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@ -6556,6 +6556,12 @@ Show the text at the center of the video frame:
drawtext="fontsize=30:fontfile=FreeSerif.ttf:text='hello world':x=(w-text_w)/2:y=(h-text_h)/2"
@end example
@item
Show the text at a random position, switching to a new position every 30 seconds:
@example
drawtext="fontsize=30:fontfile=FreeSerif.ttf:text='hello world':x=if(eq(mod(t\,30)\,0)\,rand(0\,(w-text_w))\,x):y=if(eq(mod(t\,30)\,0)\,rand(0\,(h-text_h))\,y)"
@end example
@item
Show a text line sliding from right to left in the last row of the video
frame. The file @file{LONG_LINE} is assumed to contain a single line