Re: Would I still be able to watch/record non-HDTV shows with a HDTV tuner?

On 2005-10-31, Jeff Rife <wevsr@xxxxxxxx> wrote:

>>> Some (but not all) PCI cards can only tune digital channels,
>>> and some can tune both analog and digital but can only record
>>> digital channels.
>>
>> I'm a bit baffled how a card could tune both channels but not
>> be able to record analog.
>
> Some don't provide any UI to record analog at all, because
> they didn't want to be bothered with it, and they don't have
> open drivers, so you're hosed.

So it's the drivers rather than the board that limits things.

> Some don't provide DirectShow hooks for analog channels that
> allows a codec to be applied...they will only write to an
> output surface (like a video window). Sometimes, you can get
> around this with other software and an advanced knowledge of
> DirectShow filters, but sometimes you can't.

I don't speak Windows, but again that's a driver issue, and
nothing in the board itself right?

>> How does a card prevent the application from writing the video
>> stream from the analog tuner to disk?
>
> There is no "analog stream". The tuner must do an A/D conversion of the
> signal, but it doesn't have to hand that off to anything but the video
> window.

What's a "video window"? Is it another chipset on the tuner
board that overlays a video window onto the VGA signals coming
out of a video board?

> In handing it off, the video gets re-scaled and munged in
> other ways, so you don't want to grab that for recording (even
> if you could). You want the raw fram that was created from A/D
> conversion, and sometimes you just can't get to that.

So you're saying the tuner card is also a video card and the
video data from the NTSC tuner and frame-grabber stays on-board?

--
Grant Edwards grante Yow! The LOGARITHM of
at an ISOCELES TRIANGLE is
visi.com TUESDAY WELD!!
.

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