How to debug HDMI via Framebuffer

Hi all,

I want to snap one picture by “cp /dev/fb1 ./pic” command, but all data is 0, may I know how to read hdmi framebuffer?

hi all,

can i get the display frame from host1x?

Hi KevinCN,

The “cp /dev/fb1 ./pic” command can’t work well on Tegra due to the display architecture different than standard Linux.

Not sure your use case, but you may try with gstreamer application, see the MultiMedia user guide from:
http://developer.nvidia.com/embedded/dlc/l4t-multimedia-guide-23-2

Or you could refer below topic if similar to your use case:
https://devtalk.nvidia.com/default/topic/887674/jetson-tk1/hdmi-framebuffer-blending-with-alpha-channel-/

Thanks