How to decrypt such a record?

Question

Video

ffmpeg -i wmark.png -filter_complex "[1:v]scale=w=0.25*iw:h=0.25*ih [ovrl],[0:v][ovrl]overlay=x=10:y=main_h-overlay_h-10"

I can’t understand - the resizing of the mark works for me and it becomes wildly small in the lower left corner of the video.
Enlighten me please

Answer 1

You scale the image with the command: scale=w=0.25*iw:h=0.25*ih.
With this command, it is scaled by exactly 25% of the original value.
Remove this command completely, and make the watermark image so that its size matches the size of the video you are overlaying it on (naturally, the watermark image itself can be either full screen or, for example, smaller). This operation will speed up the program, because. does not require a scaling operation.