[FFmpeg-user] conditional filter of pixel value
jnfo-c at grauman.com
Wed Sep 27 06:09:25 EEST 2017
I have a setup where I am overlaying a screen record video on top of a
camera video. The overlay works great. But I want to be able to position
or turn off the screen recording differently, depending on a single pixel
set in the screen record video.
How can I get a single pixel value (for example the bottom left pixel) to
feed into the conditional filter? What function would I use on the
-filter_complex " overlay=x='if(gte(red_pixel_value(0, 1080),200),
where red_pixel_value(0, 1080) is the function I'm looking for that gets
rgb (or ycbcr) values of a single pixel (in this case the bottom left
Thanks for any hints!
More information about the ffmpeg-user