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View Full Version : [ubuntu] Teletext and FM in USB HDTV tuners



Machacz
August 26th, 2011, 05:38 PM
Does anybody use USB HDTV (digital or hybrid) tuner ?

Write please:

1) does teletext work in digital TV ?
- Do teletext pages appear immediately after page numbers entering or
- must you wait every time because of counter rewinding ?

2) Does analog FM radio (88 - 108 MHz) work in that kind tuners ?

There are mostly no such infos on linuxtv.org.

BicyclerBoy
August 27th, 2011, 08:38 AM
I'm using a nova-500-t PCI but there is a USB version that is almost identical.

All below is in my corner:
Analogue TV switch off is in couple of years.
The certified dvb-t/s set-top boxes must provide teletext.
The teletext data is a digital datastream along with channels.
Some multiplexes/channels do not carry it.

Teletext works fine & fast (instant page navigation) with MythTV.
The 'proper' captions work better than teletext ones.
Teletext is to be switched off & replaced when analogue switch-off occurs.
Advertising most likely..

FM radio tuner would be a separate feature..some PCI/PCIe cards have this..
Internet radio replaces this for many folks..

Machacz
August 30th, 2011, 01:20 PM
Thank you very much for answer !

Excuse my english.

Teletext works fine & fast (instant page navigation) with MythTV.
Are you talking about colour links (red, green, yellow, blue) or about every three-digits directly entered number (from 100 - 899) ?


The 'proper' captions work better than teletext ones.What are 'proper' captions ?

BicyclerBoy
August 30th, 2011, 10:01 PM
Both colour button links & page numbers work with MythTV..you need to map the "colour buttons" to some real remote button..

Real captions are closed captions or sub-titles (& other languages audio streams), part of the original program & transmitted as a stream with the audio & video..just like DVD & Bluray.

Teletext subtitles still seem more common with local content & news etc.
But it will be turned off..

Machacz
August 31st, 2011, 02:08 PM
I just chase a feature refering to your words after "&" :

Both colour button links & page numbers work with MythTV
does every page 100-899 (if exists) appear immediately when you enter number ?

BicyclerBoy
August 31st, 2011, 10:29 PM
Yes..immediately instantly..
Please be aware that this applies to a small corner of the world using PAL & dvb-t/s OTA TV.

I think teletext is only available in "live TV" mode of MythTV (not recordings).
The other streamed data (EPG etc) is recorded.
I use MythTV to avoid live TV.

There could be a cache loading time from starting live TV but it is less than my menu/button pressing delay.