I found a working solution for now, with 720p resolution (raspi-config) When 1080p ffmpeg is complaining, and downscaling is neither a good idea. better have same resolution screen/capture install uv4l: https://www.linux-projects.org/uv4l/installation/ create virtual input (see options https://www.l...

Hello,
thanks for your reply, but I need to capture video and not just a snapshot, also X is not implied

Hello @dgrubb, I find myself in the very same situation (I build an openFrameworks app using openGL) and I'm trying to record with uv4l-raspidisp when I found out about it. If someone has an other option to record on card the hdmi output I'm also interested of course. Could you elaborate on the comm...