[Libav-user] what is the relationship between fontsize and image resolution in drawtext filter

[qw]

Hi,
 
I want to use drawtext filter to put some string on video stream. What is the relationship between fontsize and image resolution in drawtext filter? If fontsize is set to 20, what is the height and width of rendered text?
 
Thanks!
 
B.R.
 
Andrew
 
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