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

[Paul B Mahol]

On 3/27/20, foxtail mega <foxtailmegadeveloper at gmail.com> wrote:
> 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.

Please stop top posting.

There is sendcmd filter for this, but I think overlay filter does not
support commands,
but that could be easily fixed.

>
> 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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