I.MX6 Framebuffer Overlay
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i.MX6 offers hardware composition of 2 framebuffers for video output. Here are the instructions on how to use it.
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Note: These instructions are only available on APF6 with 3.14 Freescale kernel (apf6legacy_defconfig) |
Tools
- you will need to compile and install following tools:
Instructions
- Display something on main Framebuffer (/dev/fb0), here the stream from an analog camera:
# modprobe adv7280_tvin # modprobe mxc_v4l2_capture # gst-launch-1.0 imxv4l2videosrc ! imxg2dvideosink &
- Then activate auxiliary Framebuffer:
# echo 0 > /sys/class/graphics/fb1/blank
- and put it some stuff on it:
# fb-test -f 1 &
- then you can set alpha/overlay parameters with fb_alpha tool:
- here we move overlay to (200,200):
# ./fb_alpha -x 200 -y 200
- same but with no transparency:
# ./fb_alpha -x 200 -y 200 -g 1 -a 255
- here we move overlay to (200,200):
