Hi,
> I am using a custom bt878-based capture card and in the last days I am
> sporadically capturing images with the effects shown on the pictures I
> am sending. I would like to ask you if any of you ever experienced these
> effects. The facts are I have three of these cards plugged to the PCI
> bus of a Microstar MS6368 mainboard (VIA chipset), and input switching
> is provided by means of an external analog multiplexer.
Yes, I think I am seeing something similar. With a standard bt878 on
an ECS K7VZA board (Via KT133A chipset), the first image grabbed has
these effects. Apparently it is only the _first_ grabbed frame ('g'
in xawtv) that is affected, e.g. 'grabdisplay' works fine because you
don't usually notice the defect in the first frame.
This didn't happen originally but started only when I upgraded the
board's BIOS, I suspect the workaround for the southbridge IDE copy
bug to be the culprit. The new BIOS has an option 'PCI Master Bus
TimeOut' which directly correlates with the amount and length of
stripes I get in the first image grabbed. Unfortunately, I can't
figure out a value where the problem disappears completely.
BTW I did verify that copy compare failures from IDE0 to IDE1 _did_
happen with this board _only_ while xawtv was active (no
SoundblasterLive or similar card involved), but I didn't/don't care
much because I only have a single IDE device normally.
So I would suggest that you maybe try an older BIOS or a different
board, if you can.
Regards,
Wolfram.
