Daniel,
I can't see any way to get a decent cross fade out of this chip, unless you
genlock the cameras. It would still be pretty poor though. To properly
crossfade, you need to capture both streams at the same time. With genlock,
you could *maybe* have a 1/2 framerate cross fade. I was thinking, have the
LM1881 operate the video switch. This would mean the BT878 doesn't have to
switch inputs. Maybe the 878 doesn't have such a hard time locking the new
signal, it just needs time to physically switch? Should be easy to
investigate anyway. Yes we are manufacturing for this.
I've been talking with Niels at http://veejay.sourceforge.net/ off and on
for awhile now. I've been trying to get him to write a crossfader for V4l
devices. Apparently his next release will support multiple cards, and he
has in place a rudimentary chroma-key. Maybe instead of starting a new
project you could help on that code. I'm sure he'd love some input. I
really think that this is the missing link in linux multimedia. We have
great resources for NLE and Capture but no real time switching apps. His
comments to me on the subject that there were issues with timing, and I
take that to mean gen-lock. How were you planning to use the LM1881 sync
sep chip. Are you manufacturing a board? I've used that device for a
variety of analogue control applications years ago and had excellant
results with it. Its very stable and extremely immune to noisy power
supplies and fluctuating voltages (battery operated). Oh and cheap as dirt
in an 8 pin dip package. I have a few in inventory if you need them. If
you do restart another thread on this topic please include me on your list.
Regards,
Daniel Jircik
http://home.swbell.net/pannomat
You could use a box like the EverPlex 4BQ that combines 4 video inputs
into one output with a picture in each quadrant. It's used in small
shops for security cameras.
Or you could genlock your cameras and switch them with a 4066 and a PIC
for a lot less.
It should not be too hard to program a PIC to switch inputs on vertical
sync.
Martin
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