[mythtv-users] HD Tuner Cards
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,
>>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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