On Sun, 24 Jul 2005, Allan Stirling wrote:
Cory Papenfuss wrote:
The notch filter truly is horrible. It limits resolution to
effectively 352x480-ish. Lower than VHS IMO. That's the biggest reason
not to use bttv-based cards for a mythbox. I do find it good comic relief
to hear of people having CPU performance problems capturing 720x480 MPEG4
from a bt878 card, though... :)
-Cory
There's a very good reason to do it if you're using pure digital (SDI or PDI)
inputs. No scaling is always better :)
If you're using pure digital, than using a bt87[89] to capture
analog composite video isn't relevant, no? Apples and oranges here.
I'm still wondering if it's possible to hack a PDI input onto the PVR-150, by
tri-stating (or in the worst case pulling) the cx25480 and taking over the
video lines. But I don't have a spare '150 I can hack :(
Does anyone know if the internal video is BT656, or if it's reliant on frame
/ line starts on other pins than D1-8, Clock?
Cheers,
Allan.
My question is where does your pure digital video signal come
from? I don't know of any common consumer stuff that uses it. From what
I can tell, a BT656 signal will still require a Y/C separation before
digitizing.
Sounds like an interesting hack, though. You might be able to
play with a bttv card's I/O to try to rig an interface onto.
-Cory
--
*************************************************************************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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