[vdr] Re: Digital+ subtitles

[Ragnar Sundblad <ragge@nada.kth.se>]

--On den 4 september 2003 17:21 +0200 jvilasub@tinet.org wrote:

> apparently Digital+ doesn't use standard format for subtitles on both
> satellites (Astra and Hispasat). What I get, using all the plugins I've
> been able to find, is always a subset of them, meaning unfinished
> sentences, and similar effects.
>
> I've tried on two different installations of VDR, both v1.2.4, but also
> tried other versions, so I guess it's not a VDR issue.
It is the "ttxtsubs" plugin that does the teletext decoding,
VDR has nothing to do with it. The latest ttxtsubs is version
0.0.4.

> But, to be sure, I'd like to ask you guys, is this the case for all of
> you? Could anyone verify this with your installations? Check teletext
> pages 801, 802 and 888.
>
> My observations until now point that spanish subtitles come on page 801
> but, when a phrase is not there, it appears on page 802, which should
> be reserved for english subtitles, or, eventually, on page 888.
> Sometimes, phrases are just lost.
I don't understand this - is this when watched using an
ordinary TV set, or what do you mean?

> Questions:
> 1. I'm "pesdumping" TPID but I don't know where to start checking what
> can be wrong in its output. Does anyone know what format is being used
> and what I should be reading in order to implement a plugin for VDR to
> display them correctly?
The PID number(s) and teletext page number(s) for the language(s)
are given in the Service Information. ttxtsubs prints them out
on stdout when you switch channel.

> 2. Where should I be modifying VDR's code in order to make it send
> to /var/log/messages the received teletext lines for all the pages? Is
> it possible to be done or VDR just doesn't process them to this detail
> level?
Look in ttxtsubsdisplay.c, cTtxtSubsDisplay::TtxtData(),
you can uncomment for example line 160
//print_line((char *) Data);
This will print the lines semi-decoded on stdout.

If you want to read up on teletext you should get a copy
of ETSI EN 300 706 which you can download for free from
www.etsi.org.

/ragge



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