[FFmpeg-user] How to change overlay parameter at runtime

foxtail mega foxtailmegadeveloper at gmail.com
Fri Mar 27 12:40:48 EET 2020

Surely I will let you know if zmq works, but for zmq to work, ffmpeg has to
be built with zmq and then enable zmq. The issue is mobile-ffmpeg has not
enabled zmq by default and I will have to build it myself. I think zmq is
the only way. But I will still try some other ways first.

On Fri 27 Mar, 2020, 3:59 PM Michael Koch, <astroelectronic at t-online.de>

> Am 27.03.2020 um 11:07 schrieb foxtail mega:
> > Clarification regarding information (x,y for overlay filter).
> >
> > I am using ffmpeg for mobile devices so i am using flutter-ffmpeg. Now
> > i am using dart language for supplying x and y co-ordinates to ffmpeg
> > instance. Issue is, after i run the ffmpeg command, there is no way i
> > am able to change the coordinates, so i have to stop running ffmpeg
> > instance, and then re-run ffmpeg with changed coordinates.
> >
> > I guess i will check for suggested solution of realtime filter and
> > sendcmd. I am not sure if that would work though.
> A similar question was asked some time ago here:
> http://ffmpeg.org/pipermail/ffmpeg-user/2019-August/045065.html
> One of the suggested solutions was FFmpeg's zmq filter. But I never
> found a working example for it. If you figure out how it works, please
> write a short documentation and let me know.
> Michael
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