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

[Paul B Mahol]

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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