[mythtv-users] dual (bilingual) sound

Michael T. Dean mtdean at thirdcontact.com
Wed Nov 30 11:38:39 EST 2005


Petr Stehlik wrote:

>Dewey Smolka píše v St 30. 11. 2005 v 09:48 -0500:
>  
>
>>>works correctly so I assume that one of the stereo channels is set as
>>>default language channel when the bilingual transmission is detected.
>>>Now it's up to me to look into xawtv source code to find out which
>>>channel it is - either left or right, there is no more possibilities.
>>>      
>>>
>>When I lived in Slovakia, there were duo TVs and non-duo TVs. 
>>    
>>
>I doubt anyone serious would sell TV on the market that wouldn't know
>the bilingual stuff. People would return such sets back to shop.
>  
>
This is making me think that there may be some information transmitted 
in the VBI about the audio.  If so, it's a much harder problem to deal 
with than just setting certain recording schedules to play back the left 
or right or both channels (i.e. always play only the left channel of the 
Simpsons and the right channel of the local news).

Unfortunately, IIRC, there's still no support for VBI in Myth with ivtv 
cards.  Frame grabber cards can do captions/teletext, but I don't know 
if they do anything else with VBI.  Therefore, if it is transmitted this 
way, it's unlikely that we'll get this automatic language support soon 
because it's reliant on a major feature addition.

So, does your XMLTV data contain language elements for programs 
broadcast in multiple languages?  If so, it may be possible to include 
this information in the database so that we can short-circuit the 
autodetection process if the grabber provides language information (and, 
if the grabber gets the info wrong, you can always switch channels with 
the mute button).

Mike


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