Specification format fichier TTI (editeur)
*[https://zxnet.co.uk/teletext/documents/ttiformat.pdf TTI format]
Decodeurs:
* FFMPEG (page+subtitles), example subtitle https://trac.ffmpeg.org/wiki/ExtractSubtitles
==1.Création de pages==
===Pages crées===
[[Image:P100-0001.png|200px]]
[[Image:P404-0001.png|200px|link=https://zxnet.co.uk/teletext/editor/#0:QIECBAgQIECBAgQIECBAgQIECBAgQIECBAgQIECBAgQIECAodJoECBAgQIECBAgQIECBAgQIECBAgQIECBAgQIECBAgQICh0mgQIECBAgQIECBAgQIECBAgQIECBAgQIECBAgQIECBAgKHSaBAgQIECBAgQIECBAgQIECBAgQIECBAgQIECBAgQIECAp___-6vf______________________________________yn____9ECJXv___________________________________KHUCBATRb___50QIECBAgQIECBAgQIECBAgQIECBAgQIMHAodJoECBAi_____70QIECBAgQIECBAgQIECBAgQIEHD5-__yh0mgQIECBV_______0QIECBAgQIECBAgQIECDh8_f___-_KHSaBAgQIECv_______60QIECBAgQIECDB4-f________6EodJoECBAgQIEX________78-fP3_______________-_QoCh0mgQIECBAgQIt___________________________36FAgKHSaBAgQIECBAgQb_______________________9-nQIECAodJoECBAgQIECBB6______________________p0CBAgQICh0mgQIECBAgQINB0ogwcECBAgQIECBBgYIEBRAq_______KHSaBAgQIECBAg9HSiA4T1f________6AmdKIECDX_____8odJoECBAgQIEGg6UQIESNAgQIECBAgQIkKBAUQIFX_____yh0mgQIECBAgQHf5RAgQIECBEvQIECBAgQIEBRAgQf_____KHSaBAgQIECAidJ6zpFAgQIECBAgQIECBB4__-hRBq____8odJoECBAgQICJ0n6OlUCBAgQePjBARQIEGv__flECD____yh0mgQIECBAgJnf_8qgQIECDV___0BFAgQIEaNAUQINX___KHSaBAgQIECBAqO_yqBAgQIES9enQIECBAgQIEBRAgQf__8odJoECBAgQIECDWd______________________lECBBr__yh0mgQIECBAgQIFR3_____________________-UQIECr__KHSaBAgQIECBAgwHf_____________________5RAgQIP_8:PS=0:zx=DK0:PN=404:SC=1]][[Image:P420-0001.png|200px|link=http://edit.tf/#c:JnSCBAgQIECBAgQIEHDhwQIOHDgwQIECBAgQIECBAgQIECAmdIIECBAgQIEHDwdL4NizIwIHSaBAjX_zqBAgQIECBAgQICZ0ggQIECBB4_HS6BAgQIECLYwQEDpNAgVnQEXQsQb-ulCgJnSCBAgQIP386XQIECBAgQIECtIgQEDqAmdAQ9Gnj109N6EmdIIECBAROkEaBAgQIECBAgQIECBAg4cCZ1AgQIECBAgQICZ0igQIEGo6QQIECBAgQIECBAgQIECBAiRkzqBAgQIECBAgJnSKBAgQfjpBAgQIECBAgQIECBAgQIECBATOoECBAgQIECAmdIIECAidIIECBAgQIEHDhw4cOHDhwInSej-dXo1a9evXryZ0ggQIEH______6NGjRoECBAgQIECBAjR6UCBAgQIECBAgJnSCBAg_f______oUCDhw4cGCBBo0NECDh-QIECBAgQIECAmdIIEGj__3____-gQIESPHzVrViZAvX_0-pogQIECBAgQICZ0ggQf36BBr__0KBAgQIECNCgQIFDBAgQavqBAgQIECBAgJnSCDB_a4Fm7__QIECBAiWLECBAgQaUCNAg_oECBAgQIECAmdIaP_9qqYKv_9ggQIECBAgQIECBBqQIEGD-gQIECBAgQICZ0hr___7BEg3_2qBAgQIECBAgQIECBqgQem6BAgQIECBAgJnSHv____-iBFv_oECBAgQIMDBAgQIGqDR_aoECBAgQIECAmdIY_____f40ir-1QIECBA4QokaNHrQoG29qgQIECBAgQICZ0gjR____qi2IdTVBoQoNCFAgQIEGpAgaoNrBAgQIECBAgJnSCBAgXq0qn8gVIECJBgSuFixYsWNkCBqgQIECBAgQIECAmdIIECBAgQIP7BAgQIEGpApWLFixYhQYOrBAgQIECBAgQICZ0ggQIECDA-VKmCBAgQIECBAoWIECBA-I__vzhwQIECBAgJnSKBBg8HSZ0grZKcnBAgQIECBAg4YFxE6QQajpNEzXnUCAmdI4Pn_____yZ0giyIEaNZk4cODhY5QEf50gg1HSaD_8QICZ0ir_______aEzpBApycGCBAg4LOyBAROoCCDUdJoP_9AgQIECBAgQIECBAgQIECBAgQIECBAgQIECBAgQIECBAgQIECA]]
[[Image:P407-0001.png|200px]]
===Repo pour les pages FIXME===
# output file:
open(F,">/tmp/out-teletext.tti") || die("Cannot open output file $!");
# input png file: open (IM,"mc80.png") || die("Cannot open input file $!");;
$im = newFromPng GD::Image('IM');
close IM;
Finalement, c'est un peu la même idée que [https://fr.wikipedia.org/wiki/Projet_Cybersyn Cybersin] pour gérer l'économie au Chili dans les '70 : décentralisation économique mais dont l'info remonte à un sys central qui les synthétise et les rend à une connaissance globale (one-to-many) pour éviter les crash. Staford Beer revival
Ce qui est génial là-dedans c'est l'aspect démocratique sans tomber dans l'éparpillement des infos regroupées par un algorithme qui va de toute manière retransmettre une info médiocre, qui suit des biais de confirmation.
===Plan B Teletext===
“Bienvenue sur "plan B" teletext , tu en as assez de ce monde saturé d’information futile et de consommation inutile ? Tu veux te déconnecter de tout ça et te reconnecter à l’essentiel ? Nous essayons de donner des informations à jour et essentielles sur ta communauté locale et le monde , ceci de manière anonyme et non intrusive . Tu veux rejoindre notre communauté avec du contenu minimal ? Fais nous une proposition et nous pourrons envisager de l’ajouter. Notre signal a vocation a être diffusé de manière libre sur tous les réseaux et reçu de la manière la plus simple possible “
==3.Radio Transmission==
Try to transmit a service or pages on a radio system.
2 approaches:
*Stream mode. Send the carrousel on the radio interface using teletext packets (as generated by vbit2)
*File transfer. Transfer/update the TTI teletext files.
==4. Alternative transmission ==
=== 4.1 over DNS ===
* using several record
* gzip ?
* base 64 ?
* several TXT ?
* benefit from dnssec
* benefit from DNS caching and you choose the TTL
* DNS can be used as a CDN
* very small volume and request rate, should not bother equipement and net/sysadmin
first part of page 100
0.100.teletext.fixme.ch 3600 IN TXT "905ds76agf57dsfsad76f57dsaf576dsa"
second part of page 100
1.100.teletext.fixme.ch 3600 IN TXT "7867868LJDSLD905dadsad987asdNHDF"
JS in browser can access via DoH:
https://dns.google/resolve?name=0.100.teletext.fixme.ch&type=txt
thick clients can use built-in resolver
=== 4.2 over DAB ===
* begin with the minimum 8 kbit/s slot
* keep the receiver on to save pages in memory
* dab receiver with small tactile lcd screen?
* or no tactile, DAB receiver come often with a numeric keypad, all you need to enter a page number
* dab receiver with bluetooth radio accessible directly from a smartphone and a corresponding app? (can survive Internet and Gsm black out)
=== 4.3 POCSAG ===
* always on receiver
* about 10 messages to update one page
* multiple client listening to the same ric number?
* very good RF coverage
=== 4.4 Security ===
* PGP signature ?
==Misc==
===Twitter respons===
https://twitter.com/illarterate/status/1236637482982260737
=== Pikachu art ===
<gallery>
File:P1.png|@NikkiAndBunty
File:P2.png|@Horsenburger
File:P3.png|@LittleToonCat
File:P404-0001.png|@Protectator
</gallery>