Which TV capture card to buy?

John-Mark Gurney gurney_j at resnet.uoregon.edu
Sat Jun 2 18:01:51 UTC 2007

Dieter wrote this message on Sat, Jun 02, 2007 at 00:27 +0100:
> > > > > > The driver for the cx2388x appears to work,
> > > > > 
> > > > > Cool, so you have NTSC working?  Is the driver available for beta testing?
> > > > 
> > > > With all the programming here available over ATSC (and it looks and
> > > > sounds SOOOO much better than NTSC), I haven't even bothered/attempted
> > > > to do NTSC...
> > > 
> > > Some PBS stations have different programming on NTSC and ATSC, so
> > > we need both.
> > 
> > Ours too, but if you have a pvr (I have my own working backend), you
> > can get the same programming at another time in digital...
> A pvr/dvr is the only reason I'm going the computer tuner route
> rather than a STB ATSC tuner.  A STB would be much easier.
> But some programs are only broadcast on analog, never on digital,
> (not even weeks/months/years later at 3am) other programs are
> only broadcast on digital, never on analog.  Not to mention the
> pile of tapes that might want to get digitized someday.

Ahhh...  That may be the case, but I don't watch enough PBS to

> So a driver for the cx2388x would be great.

It's 90% done for digital...  50-70% for analog...

> > HD Jeopardy
> HD Jeopardy... sounds like writing drivers without documention.  :-)


> > I can see how NTSC could be better than some of the SD addon broadcast,
> > but my analog reception is poor enough that even the low bitrate is
> > better than the snow and regular interference...
> Did you ever get a directional antenna?

I have one for UHF that came w/ the ATI card...  But that doesn't help
KQED on channel 9...  Even KNTV that is the only station in the area
that broadcasts their ATSC signal on VHF works perfectly fine w/ a
set of rabbit ears layed flat (and pointed twards the tower)...  Though
all VHF analog signals are weak...

> > So, I'm getting data from the PAT, the PMT and both the video and audio
> > streams, along w/ padding packets (8191), and the TVCT (8187)..  So, if
> > it's doing any filtering, it's doing statistical filtering which isn't
> > very useful...
> Okay never mind, just an idea.

Yeh, I was thinking that myself at first...

> > > > The Linux driver also has a bug in that they don't consistantly keep
> > > > two registers that control serial or parallel mode for the digital
> > > > video input, and the linux-dvb list completely ignored the report...
> > > 
> > > Perhaps the Linux driver for a different card with the same chip
> > > would have different bugs?
> > 
> > The ATI HDTV Wonder card is the only cx2388x one that has the nxt200x
> > demodulator on it..
> There are other cards that use the cx2388x and have more or less working
> Linux drivers.  If there are other cards with the nxt200x there might be
> useful clues in the drivers.

There are apparently two other cards w/ the nxt200x, but neither of them
are cx2388x based...  Now that the tv season has ended, not much need for
a third tuner...

  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."

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