[FFmpeg-user] draw a circle?

Daniel Muller verliba at gmail.com
Fri Jan 24 10:18:12 CET 2014

Why anyone would use ffmpeg to draw into video, when there is
imagemagick to draw into picture and ffmpeg has filters to add picture
in the video..?
Daniel Muller, Prague, CZ

On Fri, Jan 24, 2014 at 9:51 AM, Stefano Sabatini <stefasab at gmail.com> wrote:
> On date Thursday 2014-01-23 19:17:30 -0500, Dave Rice wrote:
>> Hi all,
>> Is it possible to draw a circle in ffmpeg with the existing filters?
> No current way. Adding a drawshape filter would be cool (or
> alternatively allow filter scripting and use a scripted drawing
> library, but this is much more effort).
>> In this case I have a square video frame but want to draw a circle
>> over it where the center of the circle is the center of the video
>> frame and the diameter of the circle is equal to the width (and
>> height) of the video frame. Sort of like `ffplay -f lavfi
>> color=s=1024x1024 -vf drawbox=color=white:x=w/2:y=h/2` but with a
>> circle instead of square.
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