[FFmpeg-user] toggle between two streams

[Michael Koch]

Am 03.09.2021 um 14:21 schrieb Michael Koch:
> I have two video streams and want to toggle between them in 1 second 
> intervals. I did try this command:
>
> ffmpeg -i in1.mp4 -i in2.mp4 -lavfi streamselect=map='mod(t,2)' -t 30 
> out.mp4
>
> This doesn't work because streamselect doesn't accept expressions.
> Who has an idea for a workaround?

Found a workaround myself:

blend=all_expr='if(lt(mod(T,2),1),A,B)'

Michael