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Configuration

All the files mentioned in this file are available on the RaspThings/Rpi_configs

Network configuration

Below it is shown the network architecture of the project: Network

We will now configure the interface wlan0 of the Raspberry(which will work as an hotspot):

  1. In /etc/network/interfaces configured wlan0 as:
  • Ip: 192.169.0.1
  • Netmask: 255.255.255.0
  • Broadcast Address: 192.169.0.255
  • Network: 192.169.0.0
  1. Configured wlan0 as an hotspot in /etc/hostapd/hostapd.conf
  • WPA-PSK
  • SSID:Saturday
  • Passphrase:video12345
  1. Set the path to the hostpad configuration in /etc/default/hostapd:
  • DAEMON_CONF="/etc/hostapd/hostapd.conf"

The interface wlan1 will not need any special configuration as it will be used to connect to a wifi-network (from the Go Pro).

DHCP Server Configuration

  1. Configured the DHCP SERVER to give addresses to the new "machines in the network" in /etc/dhcpd.conf

  2. Denied interfaces of wlan0 (built-in Wifi module) in /etc/dhcpcd.conf

  3. Configured the DHCP SERVER to serve requests on the interface wlan0 in /etc/default/isc-dhcp-server

FFserver Configuration

We now got to the point, where we need to decide how the stream will look like on the Smartphone. This means we need to configure the entities(programs) responsible for the transcoding.

Supposing you have installed the FFmpeg with all extra packages, you will be able to stream every type of video you want. Furthermore, you will have the possibility to change the quality of the stream/video and manipulating the output. This means, that you decide the format of the stream.

We will start to configure the stream:

  1. Create a file, where the configuration will be set.
  2. Specify the location of the temp file which will hold the "temporary transcoded video".
  3. In the file we can configure the address and port where the stream will be streamed, the quality of it, the bandwidth available, the max number of clients, video resolution , etc.

There are several examples of configurations in the ffserver_configs/ folder.

I strongly suggest you to use the mjpg format or the webm format configurations, because these formats are browser compatible.

NGINX Configuration

We need to setup a proxy server act as a intermidiary between FFmpeg and the Smartphone, alllowing the Smartphone to send requests and receive responses.

The configuration I used was this If you look closely you will see that the proxy server is configured to listen in port 80 the only comunicating with the cellphone. There is also a proxy_pass which allows the Smartphone to receive the videostream from FFmpeg.

Whenever the NGNIX Configuration is changed, it is crucial to run nginx -s reload on a terminal.

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