Hi Justin, The machine in question is (blush) a Dell pentium 75 (no zero omitted!) optiplex with just one PCI slot and nothing in the bios to muck about with the PCI latency ... Your theory sounds quite convincing, though. Do you think RGB565 or 555 would work in principle - it seems I'm asking too much of this computer! Ivor ----- Original Message ----- From: "Justin Schoeman" <justin@xxxxxxxxxxxxxxxxxxxx> To: <video4linux-list@xxxxxxxxxx> Sent: Thursday, April 19, 2001 2:43 PM Subject: Re: weird effects > Ivor Cox wrote: > > > > Further tests indicate that the data for a capture (I am using mmap) is > > incomplete and confused by the remains in the buffer of the previous image. > > The incompleteness has a pattern which results in the grid I explained - but > > the image I get is a mixture of the latest and earlier images. > > > > If I have not waited correctly for sync or am reading the wrong buffer > > (effectively the same!) would I get an effect like this? > > > > BTW the image I see is undistorted so I am sure the RGB format is correct - > > it's just got bits missing in a near-regular pattern. > > > > Ivor > > This sounds like the PCI latency effects again. Try playing with the PCI > latency timers in your BIOS setup. > > -justin > > > > _______________________________________________ > Video4linux-list mailing list > Video4linux-list@xxxxxxxxxx > https://listman.redhat.com/mailman/listinfo/video4linux-list
