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How do I stream to HDMI?

This guide describes how to write a stream to the HDMI port.
Writing video data to the HDMI port is done with the Framebuffer publication service. After creating a channel in Restreamer, you can add the Framebuffer publication service. This publication services require that at least one framebuffer device is availbale on your system.
A framebuffer device is located in /dev with the name fb*, where * is a number usually starting from 0.
The framebuffer device might only show up as soon a display is connected.
In order to have these devices available in the Restreamer Docker container, you have to start the container with the --privileged option.

Raspberry Pi 4

On a Raspberry Pi 4 we recommend to install Raspbian "bullseye" in order to enable the framebuffer device /dev/fb0.
You have to edit the /boot/config.txt in order to set the correct resolution:
  1. 1.
    Open /boot/config.txt in an editor, e.g. sudo nano /boot/config.txt
  2. 2.
    Set hdmi_force_hotplug=1
  3. 3.
    Set hdmi_group=1
  4. 4.
    Set hdmi_mode=4 (for 1280x720) or hdmi_mode=16 (for 1920x1080)
  5. 5.
    Set hdmi_pixel_encoding=2
  6. 6.
    At the bottom in the [pi4] section, set dtoverlay=vc4-fkms-v3d
Reboot the Pi and the docker container. Now you should see the Framebuffer publication service, where you select the /dev/fb0 device and the matching color settings (usually RGB565 Little Endian).