Opened 12 years ago

Closed 12 years ago

Last modified 10 years ago

#488 closed defect (invalid)

No Videotext Display (Switzerland and Germany)

Reported by: oli.henning@… Owned by: danielk
Priority: minor Milestone: unknown
Component: mythtv Version: head
Severity: medium Keywords: Closed Caption Teletext Videotext Switzerland Germany
Cc: Ticket locked: no


The Videotext-Function is completly unavailable.

When pressing 'T' in Live-TV Mode the following is displayed for some seconds in the top-left corner: "Text ein" (german). But nothing more. I expected to see the 'Page 100' (Index-Page) of the currently selected channel (e.g. sat1, RTL, ARD, ZDF).

I tested this with a classic Bt878-based Hauppauge WinTV-card and also with a modern Hauppauge PVR-350. Both cards work fine with MythTV (recording, shifting, channel switching etc.). But the Videotext does not work in both cases. A cross-check with aletv and nxtvepg shows a perfect-working Videotext-Receiving with bttv. But MythTV shows nothing.

After reading a lot of Forums an Threads i had this 'idea': Is 'Videotext' a feature which is unknown in the US? There seems to be a function called 'Closed Caption', but as i understood this is only a Text-Display for disabled people (People who can't hear... I don't know the english word). But in Germany, Switzerland and other European Countries 'Videotext' is much more.

To clearify this: i'm in Switzerland. When we say 'Videotext', then we mean the whole Text-Infos from Page 100 (which is the Index), Page 200 ff. (Sports), Page 300ff (Programm-Info/Guide?) up to Page 899. We choos a specifig Page via the TV-Remote and wait for the Page to be displayed on TV-Screen. Each page has 40x25 Chars (or 40x24? i don't know exactly).

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Change History (12)

comment:1 Changed 12 years ago by danielk

  • Resolution set to duplicate
  • Status changed from new to closed

To get a particular teletext page you need to type the number then press T, and smart channel changing must be disabled. I believe this only works with a bttv card, but Frank Muenchow in Germany is working to make analog teletext work with pvr-x50 and DVB cards in ticket #368.

comment:2 Changed 12 years ago by Webmaaschter@…

  • Resolution duplicate deleted
  • Status changed from closed to reopened

I also have an Bt878-based Hauppauge WinTV-card and Teletext as described above doesnt work. I spoke with Oli Henning who opend this Ticket in the first place and he told me, that Teletex doesnt work for him too on his Bt878-Card.

Typing an number and then pressing T results in an " -CC: ? ". Typing T and then the numer results in an " TXT ein " .

I'm working with revison 8053.

comment:3 Changed 12 years ago by anonymous

  • Keywords Closed Caption Teletext Videotext Switzerland Germany added
  • Version set to head

comment:4 Changed 12 years ago by Carlos Fernández Manteiga <churly@…>

AFAIK it is not supported by MythTV. Here in Spain we also call TXT to the Teletext or Videotext. I think it only displays the page 888 (at least all Spanish channels transmit closed captions in that page).


comment:5 Changed 12 years ago by ijr

  • Owner changed from ijr to danielk
  • Status changed from reopened to new

comment:6 Changed 12 years ago by danielk

  • Milestone set to unknown

Q: What is you VBI Format setting? It must be "pal teletext" (not "none" or "ntsc") for teletext. Q: Are you sure your /video/v4l/vbiX device in the card config corresponds to the vbi device for your /video/v4l/videoY device?

My guess is that your VBI Format is set incorrectly. These are both backend settings, so you need to run 'mythtv-setup' to check these.

BTW The correct initial display after inputing a page number is "TXT on" or its translation in German. The page number is not displayed.

comment:7 Changed 12 years ago by danielk

(In [8178]) References #488. Show the selected teletext page when enabling a page.

comment:8 Changed 12 years ago by Webmaaschter@…

Sorry for the Timeout... my System was broken.

Q:What is you VBI Format setting?

A:Pal Teletext

Q:Are you sure your /video/v4l/vbiX device in the card config corresponds to the vbi device for your /video/v4l/videoY device?

A:I think so.
Video: /dev/video0
Vbi: /dev/vbi0
Teletext works with: "alevt -vbi /dev/vbi0" while using mythtv to switch the channels.

With Rev. 8235 :
Typing an number and then pressing T keeps resulting in an " -CC: ? ".
Typing T (-CC:? appears) and then an Number like X now results in an " TXT X0000 ".

BTW I'm using SuSE 10.0.

comment:9 Changed 12 years ago by danielk

(In [8266]) References #488.

Fixes a off by 1<<16 error in teletext page entry.

comment:10 Changed 12 years ago by danielk

  • Resolution set to invalid
  • Status changed from new to closed

So after some testing by Webmaaschter, it appears that the NuppelVideoRecorder? only records subtitle teletext pages. This could be fixed but it would really require someone in a teletext country to fix this. The callback function is vbi_event() in NuppelVideoRecorder?.cpp. It masks out non-subtitle pages; but disabling this mask is not sufficient. Anyone wishing to work on this should also look at #368.

Since it turns out this is feature request after all, I'm marking this as 'invalid'. Anyone wishing to implement this let me know, I may have some advice on how to go about it; then reopen this ticket as a patch or enhancement ticket once you have a patch.

comment:11 Changed 10 years ago by hmgbl@…

I still have this problem with videotext not working. I have Ubuntu 8.04 and Mythtv 0.21. I have a Cynergy 200 TV card.

comment:12 Changed 10 years ago by oli.henning@…

I was the original poster of this Bug. My Hardware is:

Hauppauge PVR-350 with TV-IN and Video-Out (MPEG Encoder AND Decoder) TV connected to Video-Out of PVR-350 X-Window-Driver configured to use Video-Overlay of PVR-350 (für Menus, Pictures etc.) MythTV configured to use PVR-350 MPEG Decoder (so it uses the Video-Out of this Card) Nothing connected to my 'normal' On-Board-VGA-Graphics.Card (15-Pin-VGA-Connector)

With this configuration i can have no Videotext (neighter on Live-TV nor on Recorded Shows)

But: When i disable the 'use PVR-350 MPEG Decoder' feature, then the MPEG-Decoding is done by the CPU and the decoded video is rendered via the X-Window-Driver (=Video-Overlay). With this configuration I HAVE VIDEOTEXT, both in LiveTV and recorded shows!

This makes sense, as the MPEG nor streams through the MythTV-Software, which can decode 'in a magig way0 (megic für me) the Videotext-Date and 'render' the Characters over the decoded Video-Frames.

More differences between 'use PVR-350 MPEG Decoder' and 'not to use it' are:

  • With Software-Decoder i can use 'increase playback speed'. With Hardware-Decoder this isn't working
  • With Software-Decoder i can use Zooming
  • With Software-Dcoder i can use the Aspect-Ration-Switching

perhaps there are more differences, but this should be enought to make clear what happens 'behind the scenes'

Greetings from Switzerland
Oliver Henning

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