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

[Rainer M Krug]

Thanks Michael - your book becomes even more valuable!


> On 8 Apr 2021, at 11:12, Michael Koch <astroelectronic at t-online.de> wrote:
> 
> 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.
> 
> Michael
> 
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--
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany)

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