[mythtv-users] OT: DVB/HDTV/Analog tuner cards

Leo Przybylski void at leosandbox.org
Thu Jul 14 16:56:07 EDT 2005

So an HDTV card doesn't do mpeg encoding because of the broadcasted mpeg 
streams. I guess  that means that the standard NTSC will have to be 
software encoded which would explain why most people use the PVR-250 for 
standard NTSC tuning.

I assume the same would be for other DVB cards like the ones by WinTV. 
They are expecting streams to already be encoded, so there is no need to 
encode them really.

This puts a lot of things into perspective for me. Still, I am not 
receiving HD input yet, so I need a standard NTSC tuner. Does anyone 
know of one that is capable of hardware encoding and CC?

Much thanks,

Leo Przybylski

Brandon Beattie wrote:

>On Thu, Jul 14, 2005 at 11:03:53AM -0700, Leo Przybylski wrote:
>>I?ve noticed though that there are a whole slew of digital cards that
>>people are talking about using. I don?t know much about them though. I
>>noticed people like to use pcHDTV or DVB cards. I looked at the NEXUS and
>>pcHDTV cards and I just couldn?t figure out if they supported closed
>>captioning well.
>>Does anyone know if they support closed captioning?
>The hardware/cards do. I personally have never tried it, but there's no
>reason that a pcHDTV card for instance wouldn't work.  If someone tries
>CC and it doesn't work on HDTV, submit a bug and it will get fixed or
>added.  It may be that stations aren't sending CC in HD yet too maybe?
>Give me a week and I can check and respond for sure.
>>Also, are the pcHDTV or DVB cards only for HD/Digital television or could
>>I use it on my analog cable tv signal as well? I plan to go to HDTV pretty
>>soon and maybe even upgrade to digital cable for the HD cable stations. I
>>just don?t plan to do it right now. I?m just interested in the best
>>quality picture I can get with mpeg2 encoding and closed captioning from
>>my analog cable signal. Is it possible to do that with DVB or pcHDTV
>DVB is just a driver interface.  The air2pc only works under DVB and
>only does HDTV.  The pcHDTV cards work under DVB, Video4Linux (Which is
>still the most stable way of watching HDTV in Myth for just a couple
>more months probably) and the pcHDTV cards also can do NTSC or regular
>TV.  Myth only supports using a card in one mode (HDTV or NTSC) without
>reconfiguring the config for a card.  Sometime ago Myth was hacked to
>do both without reconfiguring, but that hack is no longer maintained.
>Since video and audio encoding are a broadcasters responsibility for
>HDTV, encoding quality is not controlled by a users hardware or MythTV.
>If you want good mpeg2 encoding quality for NTSC/standard TV, you can
>either use a pcHDTV card and get decent results, or spend ~$100 or more
>for an NTSC mpeg2 encoder card.  People who want HDTV and Standard def
>TV usually buy a pcHDTV card AND a PVR-250 card.
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