Some time ago, we were discussing this concerning the ECS K7VZA board
with frame grabbers:
> From: M.Hunold@xxxxxxxxxxx (Michael Hunold)
>
> > 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.
>
> I'm using a K7VZA (KT133A) with a "Multimedia Extension Board"
> (Philips SAA7146 based) and the driver I have written myself. 8-)
>
> I am experiencing the same problems. (Under Windoze the
> situation is quite the same -- even with latest 4in1
> drivers...)
>
> I guess VIA really f*ck*d some things up inside their
> PCI implementation. 8-(
I did try Michael's promising suggestion and played with PCI latency
settings, but unfortunately this didn't change anything.
Now, this week there was a new BIOS release from ECS
(http://www.ecs.com.tw/download/download.htm).
This new BIOS has solved the problems with stripes on captured images
for me. I'm back to the original state of my board where grabbing
runs smoothly, even for the first few frames. The BIOS also boosted
UDMA 100 speed by a factor of two, so if you're running an older
version from between May and September, I'd definitely try upgrading.
Regards,
Wolfram.
