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![rpidatv banner](/doc/img/spectreiq.jpg)
# rpidatv
**rpidatv** is a digital television transmitter for Raspberry Pi (B,B+,PI2,PI3,Pizero) which outputs directly to GPIO. This version has been developed for use with an external synthesized oscillaotor and modulator/filter board.
**rpidatv** is a digital television transmitter for Raspberry Pi (B,B+,PI2,PI3,Pizero) which output directly to GPIO.
*(Created by Evariste Courjaud F5OEO. Code is GPL)*
# Installation for BATC Version
The preferred installation method only needs a Windows PC connected to the same (inetrnet-connected) network as your Raspberry Pi.
- First download the March 2016 release of Raspbian Jessie Lite on to your Windows PC from here http://downloads.raspberrypi.org/raspbian_lite/images//raspbian_lite-2016-03-18/. Evariste has not tested with later Raspbian images. There are some problems with the latest version of Raspbian, which Evariste and I are working to resolve.
- Unzip the image and then transfer it to a Micro-SD Card using Win32diskimager https://sourceforge.net/projects/win32diskimager/
- Power up the Pi with the new card inserted, and a network connection. No keyboard or display required.
- Find the IP address of your Raspberry Pi using an IP Scanner (such as Advanced IP Scanner http://filehippo.com/download_advanced_ip_scanner/ for Windows, or Fing on an iPhone) to get the Pi's IP address
- From your windows PC use Putty (http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html) to log in to the IP address that you noted earlier.
- Log in (user: pi/password: raspberry), and type "sudo raspi-config" to open the configuration tool. Select option 1 to expand the file system to the whole disk.
- Exit raspi-config (press tab twice then press return), and reboot.
- Power-off, connect the camera, reconnect power and reboot. Log in again.
- Cut and paste the following code in, one line at a time:
# Installation
Install a Raspbian Lite : ([Raspbian Lite](http://www.raspberrypi.org/downloads/raspbian/))
```sh
wget https://raw.githubusercontent.com/davecrump/rpidatv/master/install.sh
chmod +x install.sh
./install.sh
$ wget https://raw.githubusercontent.com/F5OEO/rpidatv/master/install.sh
$ chmod +x install.sh
$ ./install.sh
```
- For French menus and keyboard, replace the last line above with
# Hardware
Plug a wire on GPIO 12, means Pin 32 of the GPIO header : this act as the antenna. Length depend on transmit frequency, but with few centimeters it works for local testing.
# Modulator
**rpidatv** is located in rpidatv/bin folder
```
rpidatv -2.0.0
Usage:
rpidatv -i File Input -s Symbolrate -c Fec [-o OutputMode] [-f frequency output] [-l] [-p Power] [-h]
-i path to Transport File Input
-s SymbolRate in KS (125-4000)
-c Fec : 1/2 or 3/4 or 5/6 or 7/8
-m OutputMode
{RF(Modulate QSK in RF need -f option to set frequency)}
{IQ(Output QPSK I/Q}
{PARALLEL(Output parallel (DTX1,MINIMOD..)}
{IQWITHCLK(Output I/Q with CLK (F5LGJ)}
{DIGITHIN (Output I/Q for Digithin)}
-f Frequency to output in RF Mode in MHZ
-l loop file input
-p Power on output 1..7
-x GPIO Pin output for I or RF {12,18,40}
-y GPIO Pin output for Q {13,19,41,45}
-h help (print this help).
Example : sudo ./rpidatv -i sample.ts -s 250 -c 1/2 -o RF -f 437.5 -l
```
# Transport stream
**rpidatv** needs a DVB transport stream in input. In the past, ffmpeg was used to generate transport stream. Because ffmpeg is not completely DVB compliant and induces latency, an other tool is proposed : **avc2ts**
# H264 encoder and transport stream encapsulator
**avc2ts** is located in rpidatv/bin folder
```
avc2ts -1.0.0
Usage:
rpi-avc2ts -o OutputFile -b BitrateVideo -m BitrateMux -x VideoWidth -y VideoHeight -f Framerate -n MulticastGroup [-d PTS/PCR][-v][-h]
-o path to Transport File Output
-b VideoBitrate in bit/s
-m Multiplex Bitrate (should be around 1.4 VideoBitrate)
-x VideoWidth (should be 16 pixel aligned)
-y VideoHeight (should be 16 pixel aligned)
-f Framerate (25 for example)
-n Multicast group (optionnal) example 230.0.0.1:10000
-d Delay PTS/PCR in ms
-v Enable Motion vectors
-i IDR Period
-t TypeInput {0=Picamera,1=InternalPatern,2=USB Camera,3=Rpi Display,4=VNC}
-e Extra Arg:
- For usb camera name of device (/dev/video0)
- For VNC : IP address of VNC Server. Password must be datv
-p Set the PidStart: Set PMT=PIDStart,Pidvideo=PidStart+1,PidAudio=PidStart+2
-s Set Servicename : Typically CALL
-h help (print this help).
Example : ./rpi-avc2ts -o result.ts -b 1000000 -m 1400000 -x 640 -y 480 -f 25 -n 230.0.0.1:1000
```
# Console interface
A console interface is provided under rpidatv/scripts
```sh
./install.sh fr
$ /home/pi/rpidatv/scripts/gbmenu.sh
```
- When it has finished, accept the reboot offered or type "sudo reboot now", log in again and then start the software by typing:
# Touchscreen interface
![Rpidatvgui](/doc/img/rpidatvgui.jpg)
A graphical interface is provided under rpidatv/bin/ folder
```sh
/home/pi/rpidatv/scripts/menu.sh menu
$ /home/pi/rpidatv/bin/rpidatvgui
```
You can now explore the menu options and play.
Evariste has only tested on an RPi2, I have been using an RPi3. I succeeded in generating a direct RF output (from GPIO pin 32) on 437 MHz at 333KS using the on-board camera as the source; it would not work reliably at higher SRs. The big win for me is that I could feed the I and Q signals from pins 32 and 33 directly into the LC filter on my old DigiLite modulator and generate a 2MS QPSK H264 DVB-S signal from the on-board camera. Some adjustment of the bias is required as the I and Q signals from the Pi are 3.3v, not 5v as provided by the DigiLite encoder.