[FFmpeg-user] Plotting Circles and labels on individual frames of a movie

Michael Koch astroelectronic at t-online.de
Thu Apr 8 12:12:59 EEST 2021

Am 08.04.2021 um 11:10 schrieb Rainer M Krug:
> Hi Nicolas
>> On 8 Apr 2021, at 10:58, Nicolas George <george at nsup.org> wrote:
>> Rainer M Krug (12021-04-08):
>>> I have found “draw_text”
>>> (https://ffmpeg.org/ffmpeg-filters.html#drawtext), but I have no idea
>>> how I could do this. We can assume that I have a text file with the
>>> following columns:
>>> FRAME: the frame on which the labels and circle should be plotted
>>> X:     the x-coordinate
>>> Y:     the y=coordinate
>>> LABEL: label for the point
>>> Also possibly important, there are multiple (many) particles for which
>>> circles and labels need to be plotted on each frame.
>> This looks like something ASS subtitles can do easily.

Good idea!

> Interesting - could you give me some more pointers? Formats?

Chapter 2.139 in my book.


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