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

qw applemax82 at 163.com
Sun Jun 3 20:57:42 EEST 2018


Thanks for reply.

Another question:

I want to print frame number on video, where each frame has their own frame number. If text is set to frame number, the width of some frame number will become different, such as 6, 13 and 370.

Is there any way to show the text of frame number and keep the same width of text by adding some space at the same time?




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邮箱:applemax82 at 163.com

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在2018年06月01日 22:55,Gyan Doshi 写道:

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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