teletekst

This is a NodeJS/Express based webpage that generates a text view of a Teletekst page, including a few controls to select a page and subpage.

The data is extracted from a JSON file from https://nos.nl/teletekst webpage, or from a gif or png file. The result can be viewed at https://teletekst-display.herokuapp.com/tt. The image parsing of teletekst image pages is inspired on the php functions by https://github.com/rhuijben/tt-parser.

New local Teletext broadcaster

Updated the rendering to JSON and teletext images from local broadcastting stations. Included are:

  *NOS Teletekst
  *TV Rijnmond Tekst (_sadly they recently stopped using teletext_)
  *InfoThuis
  *Omroep West
  *Omroep Gelderland
  *Omroep L1mburg
  *Omroep Brabant
  *RTV Oost
  *RTV Drenthe

Testing

To debug and find new character hashes use the testimg.js or testgif.js javascript file an pipe the output to a etx file. In the testimg.js alter the url with the teletext page image (a png-file in this case) For example, execute the following command on the commandline:

nodejs testimg > unknownhash.txt

All known characters will be ignored, the unknown ones will be exported into the text file with their posititon and hash. On the position the unknown character was found a = sign fill be put in the teletext text.

JSON output

The ttj.js will generate a JSON object to be used for example in a Arduino to show teletext messages like news or plane arrivals on Schiphol.