[FFmpeg-user] what's print() used to do in filter graph?

Gyan Doshi gyandoshi at gmail.com
Fri Jun 1 17:55:27 EEST 2018

On 01-06-2018 08:10 PM, qw wrote:

> I don't find the description of print() in the vf filtergraph in ffmpeg website, i.e. http://ffmpeg.org/ffmpeg-filters.html#drawtext-1

print() function is part of the eval API. All available functions are 
documented at https://ffmpeg.org/ffmpeg-utils.html#Expression-Evaluation

> Where to get the detailed description of fontsize?

The text is rasterized by the freetype lib, not ffmpeg. See some 
background on fontsizes at 


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