[mythtv] DVB Driver for the pcHDTV HD-3000

Todd Freeman freeman at andrews.edu
Tue Feb 1 21:43:40 EST 2005

On Tue, Feb 01, 2005 at 06:13:34PM -0500, Cory Papenfuss wrote:
> >
> >	#2 Those of us in the fringe need the NTSC channels to cover for
> >	the various LPs and such that do not have a ATSC broadcast.
> 	From what I understand, the HDTV stuff is quite sensitive to noise 
> issues.  Again, fair enough.

Well... noise isn't to bad in my situation... it's the availability of channels period... I have to hit Chicago just to get a HDTV version of ABC.

> >
> >	#3 When on the fringe being able to fallback to the NTSC when the 
> >	ATSC
> >	is not an option (due to rain.. etc.. messing with signal) although
> >	not supported yet would be a GREAT feature and I can see it happening
> >	fairly quickly after Daniel's patches go in. Recording snowy 
> >	something
> >	is better than recording nothing. On my HD2000 card I rarely hit more
> >	than 68% signal on the best stations which as you can guess is
> >	marginal in bad weather.
> 	Transparent fallback?  That sounds like a real bugger to 
> implement... lots of different ways to do it.  Digital channels would need 
> to have a record of the equalent analog channel.

Not hard at all... we do signal detection at the start of the recording... if it falls below threshold we currently bork. If we have a concept of another input on the same card then we can "downgrade" to that input.

> >
> >	#4 Although WinTV cards and such are cheap... they take another PCI
> >	slot which most media PCs seem to be short on :} Hence both on one 
> >	card
> >	is VERY nice when you want to do video capture from a video
> >	surveillance system that feeds onto your antenna line and such.
> >
> 	True.  As I said once before, though, the real killer card would 
> have an MPEG-2 encoder chip for the analog SDTV feed.  I guess the 
> processing power required isn't as big of a deal on the HDTV card.  If the 
> machine has the umph to do HDTV, it should have enough to encode 
> uncompressed video on the fly.  Of course, frontend has different 
> requirements from backend, but still.  I'm just used to trying to coerce 
> my dual Celeron 300->450 to do reasonable on-the-fly bt878 compression 
> (didn't go).

Agreed... a realtime MPEG-2 encoder built in for capture would be killer. Alas I doubt a card will ever come like that :{

> >	#5 profit ?!?   (err... ooops... how'd that get in there)
> 	Can't forget that!  Maybe "geekness" fame and fortune... :)
> -Cory
> *************************************************************************
> * Cory Papenfuss							*
> * Electrical Engineering candidate Ph.D. graduate student               *
> * Virginia Polytechnic Institute and State University 			*
> *************************************************************************

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Todd Freeman  Ext 6103                   .^.    Don't fear the penguins!
Programming Department                   /V\
Andrews University                      // \\    http://www.linux.org/
http://www.andrews.edu/~freeman/       /(   )\   http://www.debian.org/
                                        ^^ ^^
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