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

[foxtail mega]

Actually I meant when ffmpeg is running, I want to send parameters to that
running ffmpeg instance and that should change the filter_complex overlay
parameters in the next frame of processing.

Using expression is like hard coding parameters into ffmpeg command. I need
something where I can send the variable parameters when I need it without
stopping the current running ffmpeg command.

On Fri 27 Mar, 2020, 2:11 PM Paul B Mahol, <onemda at gmail.com> wrote:

> On 3/27/20, foxtail mega <foxtailmegadeveloper at gmail.com> wrote:
> > can someone please help regarding this issue ?
> >
> > -re -i video.mp4 -i image.png -filter_complex "[0:v][1:v]
> > overlay=25:25:enable='between(t,0,4)'" -pixel_format yuv420p -tune
> > zerolatency -c:a copy -c:v libx264 -crf 27 -preset veryfast -f mpegts
> > udp://localhost:5454
> >
> >
> > here i am using overlay as 25:25, but i wish to change that at
> > runtime, and i know i can't use variable for this, so how do i change
> > this overlay parameters at runtime ?
>
> Using expressions, everything is clearly explained in available
> documentation.
>
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