Video-PI.md

Wipe out everything we don't want (from Raspbian Jessie Lite).

sudo apt-get -y update
sudo apt-get -y dist-upgrade
sudo apt-get -y purge `sudo dpkg --get-selections | grep -v "deinstall" | grep x11 | sed s/install//`
sudo apt-get -y purge `sudo dpkg --get-selections | grep -v "deinstall" | grep python | sed s/install//`
sudo apt-get -y purge `sudo dpkg --get-selections | grep -v "deinstall" | grep sound | sed s/install//`
sudo apt-get -y purge `sudo dpkg --get-selections | grep -v "deinstall" | grep gnome | sed s/install//`
sudo apt-get -y purge `sudo dpkg --get-selections | grep -v "deinstall" | grep lxde | sed s/install//`
sudo apt-get -y purge `sudo dpkg --get-selections | grep -v "deinstall" | grep gtk | sed s/install//`
sudo apt-get -y purge `sudo dpkg --get-selections | grep -v "deinstall" | grep desktop | sed s/install//`
sudo apt-get -y purge `sudo dpkg --get-selections | grep -v "deinstall" | grep gstreamer | sed s/install//`
sudo apt-get -y purge `sudo dpkg --get-selections | grep -v "deinstall" | grep avahi | sed s/install//`
sudo apt-get -y purge `sudo dpkg --get-selections | grep -v "deinstall" | grep dbus | sed s/install//`
sudo apt-get -y purge `sudo dpkg --get-selections | grep -v "deinstall" | grep freetype | sed s/install//`
sudo apt-get -y purge raspberrypi-artwork penguinspuzzle
sudo apt-get -y autoremove
sudo apt-get clean
sudo apt-get install omxplayer

Update any firmwares etc.

rpi-update

Disable bootspam (& overclock the NIC) in /boot/cmdline.txt by appending

logo.nologo quiet smsc95xx.turbo_mode=y

Overclocking options appended to /boot/config.txt

#dtparam=audio=on		#Comment out to disable audio

#CPU
arm_freq=1000                   #Frequency of ARM processor core in MHz (default 700)
over_voltage=6                  #ARM/GPU voltage adjust, values over 6 voids warranty (default 0)
core_freq=500                   #Clock frequency for the VPU (default 250)

#RAM
gpu_mem=256                     #Give the GPU a load of memory (default 64)
sdram_freq=600                  #Frequency of SDRAM in MHz (default 450)
sdram_schmoo=0x02000020         #Set SDRAM schmoo to get more than 500MHz freq (default unset)
over_voltage_sdram_p=6          #SDRAM phy voltage adjust (default 0)
over_voltage_sdram_i=4          #SDRAM I/O voltage adjust (default 0)
over_voltage_sdram_c=4          #SDRAM controller voltage adjust (default 0)

#SD Card
dtparam=sd_overclock=100        #Clock in MHz to use for MMC microSD (default 50)

# Limits
boot_delay=1			#Helps to avoid sdcard corruption (default 0)
disable_splash=1		#Avoids the rainbow splash screen on boot (default 0)

...and, assuming you want to play at 1080p/24f (via https://www.raspberrypi.org/documentation/configuration/config-txt/video.md)

hdmi_group=1
hdmi_mode=32

Disable root login, password login etc. in /etc/ssh/sshd_config

PermitRootLogin no
PasswordAuthentication no
X11Forwarding no

Pray you've added the correct authorized_keys

Play a 1080p video:

omxplayer --live rtmp://<server_ip>/live/foo

On a remote PC

Assuming you've already got Docker installed, fire up a RTMP server:

docker run -d -p 1935:1935 --name nginx-rtmp tiangolo/nginx-rtmp

Run ffmpeg to output to rtmp

ffmpeg -re -i big_buck_bunny_1080p_h264.mov -c copy  -f flv rtmp://<server>/live/foo

Or via a CasparCG

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <paths>
    <media-path>media/</media-path>
    <log-path>log/</log-path>
    <data-path>data/</data-path>
    <template-path>template/</template-path>
    <thumbnail-path>thumbnail/</thumbnail-path>
    <font-path>font/</font-path>
  </paths>
  <lock-clear-phrase>secret</lock-clear-phrase>
  <channels>
    <channel>
      <video-mode>1080i5000</video-mode>
      <channel-layout>stereo</channel-layout>
      <consumers>
        <ffmpeg>
          <path>udp://<server>:1234</path>
          <args>-f mpegts -acodec libvo_aacenc -ar 48000 -ab 64k -pix_fmt yuv420p -vcodec libx264 -preset ultrafast -profile:v high -level 30 -maxrate 10000000 -bufsize 10000000 -b 1200k</args>
        </ffmpeg>
      </consumers>
    </channel>
  </channels>
  <controllers>
    <tcp>
      <port>5250</port>
      <protocol>AMCP</protocol>
    </tcp>
  </controllers>
</configuration>