Hi, I have a situation. I do not have a 4K screen, but I need to screencapture at 4K using ffmpeg to test something.
I tried with: $ ffmpeg -report -y -f x11grab -r 25 -s 3840x2160 -i :0 -pix_fmt yuv420p -vcodec libx264 -ar 48000 -qscale 1 -r 24 4k_screecapture.mp4 but got an very obvious error as my screen is only full HD: [x11grab @ 0x20a29c0] Capture area 3840x2160 at position 0.0 outside the screen size 1920x1080 :0: Invalid argument Appreciate any inputs on how to: 1. create a virtual xserver of 4k resolution without any physical display, and pipe to the physical screen (downsizing to FullHD ). 2. I would like to the 4K steam to a virtual device (v4l2 loopback). Thanks! _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user
