Difference between revisions of "Grandtec Grand X Guard"
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These cards a relatively inexpensive by using one bt chip shared for | These cards a relatively inexpensive by using one Brooktree (bt) video capture chip shared for a number of inputs. The upside is low cost, downside is performance. | ||
* Using 1 source you get 25 fps | * Using 1 source you get 25 fps | ||
Revision as of 18:06, 13 July 2008
These cards a relatively inexpensive by using one Brooktree (bt) video capture chip shared for a number of inputs. The upside is low cost, downside is performance.
- Using 1 source you get 25 fps
- Using 2 source you get 5 fps each (10 fps total)
- Using 4 sources you get 2.5 fps each (10 total)
...and so on. if you use more than 1 source, total FPS is 10/12
Please note that this will only show up as one video input (/dev/video0 for me). You will use channels of the input to access the multiple ports.
bttv supported card types
- 57 -> GrandTec 'Grand Video Capture' (Bt848) [4344:4142]
- 77 -> GrandTec Multi Capture Card (Bt878)
- 103 -> Grand X-Guard / Trust 814PCI [0304:0102]
GrandTec Grand X-Guard 4P
Autodetected correctly and confirmed working with bttv driver.
GrandTec Grand X-Guard 9P
Confirmed working under ZoneMinder 1.22 (probably earlier). bttv driver 0.9.17 incorrectly detects this as a card type 57. You need to edit modprobe.conf (see below), then do a rmmod bttv and modprobe bttv to get it to work correctly.
/etc/modprobe.conf
options bttv card=103
I haven't had any problems testing with a single input but with each input added, the image gets brighter and more washed out. At 4 monitors, the image is no longer viewable with the default monitor brightness and contrast. The current theory is that providing a live connection to each input will resolve the problem.
GrandTec Grand X-Guard 16P
Needs the same configurations changes as the 9P card above.
