[mythtv-users] HD Tuner Cards

Rudy Zijlstra mythtv at edsons.demon.nl
Thu Jan 4 00:18:36 UTC 2007


Steven Adeff wrote:

>On 1/3/07, Jay R. Ashworth <jra at baylink.com> wrote:
>  
>
>>On Wed, Jan 03, 2007 at 04:01:33PM -0500, Rich West wrote:
>>    
>>
>>>Am I correct in my understanding that OTA HD is sent via MPEG2?  So,
>>>when you capture it, you capture it as raw MPEG2?
>>>
>>>So, the pressure is really on the frontend in order to properly play it,
>>>right?
>>>      
>>>
>>I'd say that's pretty close, yeah.  It comes in, I believe, as an MPEG2
>>transport stream, and the card has to pick the desired program stream
>>out of that and ship it over the bus, but as with Hauppauge analog
>>cards, there's no compression being done on the CPU (and unlike those,
>>there's no compression being done on the card, either), so the only
>>time MPEG has to be manhandled is, as you say, on playback.
>>    
>>
>
>h264 is another option (instead of MPEG2), though I don't believe any
>stations in the U.S. use it yet, though the BBC is currently testing.
>  
>
US will go that way. Europe is using it europe wide, not only BBC. Its 
used on DVB-C, DVB-S, DVB-T and even over IP for IP STBs.

>Works basically the same way, its just a much better compression
>algorithm, requiring more decoding power, and I don't believe there is
>currently any linux accelerated support for.
>  
>
Not that i am aware of no.


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