Cory Papenfuss wrote:
On Sun, 24 Jul 2005, Allan Stirling wrote:
There's a very good reason to use native resolution 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.
The btxxx is not used to capture analog video. See below.
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.
That's what I did. The BT878 supports BT656 over it's GPIO pins. The PDI
input is from a Pace Sky Plus box - It uses a seperate video encoder
chip, so the BT656 internal bus was easy enough (apart from the small
soldering) to access. IDE cable from there to the bttv card.
I had to hack the bttv driver somewhat to readd the Digital support that
appears to have been stripped out due to lack of interest. I had timing
issues, I believe, leading to the state machine on the bt878 getting
confused, so I didn't bother submitting my bttv patches. If you're at
all interested, the initial patch I based things off is
http://www.mail-archive.com/[email protected]/msg04691.html
There are some issues with it, however.
I'm still interested in the question above, since the DMA controller /
frame grabber on the PVRx50 may be more able to cope with slight skews
in the clock / data lines, and it's already designed to take digital
input in the driver.
Cheers,
Allan.
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