[Motion-user] Distorted images when using high resolution on multichip card

[Peter M. <pet...@go...>]

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Hello List,

i successfully built a 4 channel dvr, using a 4 chip bt878 card with =20
768x576@25fps. Now I=B4m trying to do the same with 8 inputs on an 8 =20
chip saa7134 board plus two inputs on a 4 input 1 chip bt878. The =20
1chip card works as expected, but with the 8 chip card i can only use =20=

512x384, anything larger yields in distorted images. The error looks =20
like shuffled lines or misread/faulty memory, and it only appears, =20
when there=B4s motion in the picture, a still image works fine. I=B4d =20=

like to use 768x576 or 640x480 on this machine. Watching multiple =20
inputs with mplayer works fine at these sizes without distortions.
- - Lack of RAM? The machine got 2GB, top says there=B4s some 500MB =
free.
- - Lack of Bandwidth? Might the PCI-Bus be too slow to handle the =20
data? How much data is there to expect from 768x576 with palette yv12?
- - Lack of Horsepower? It=B4s a c2d 6420, top says 35% idle.
Neither dmesg nor syslog show anything helpful.

My questions:
- - How can i calculate the data rates? Are there any formulas, rules =20=

of thumb,...?
- - Any other ideas?

kind regards and thanks in advance
Peter Marquardt
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