On Sat, Sep 08, 2007 at 06:37:21PM +0200, Roman Haefeli wrote: > hi andrew > > i am not an expert at all in usb-cameras, but i noticed as well, that > this camera has been used for astrononimcal purposes, that is why bought > it. though i don't know well other usb-cameras, but some dv-camcorders, > and i must say, that this spc900nc camera does require only very little > light to give quite good results. even with only a weak bulb in the > room, the pictures look like they were recorded at daylight (also > because of the good withe balancing function).
That is good to hear. Sounds like it should be suitable for my purposes. > the manufacturer also says, that you can achieve framerates up to 90fps. > i never got that working with pwc (couldn't try on windows yet). do you > know, if the camera is supposed to really deliver that amount of frames? The FAQ says it cannot do that high a frame rate with VGA resolution because it would require too much bandwidth. However the Philips website says it is a Hi-Speed USB device, not a Full Speed USB device. This could be more Marketing deception from Philips, but a Hi-Speed USB device can do 480Mbps, where as a Full Speed device does 12Mbps. I could understand it not having enough bandwidth with 12Mbps, but with 480Mbps USB should not be the limit. Grab a copy of the perl program usbtree at http://www.linux-usb.org/usbtree When you run it you should get something like: /: Bus 04.Port 1: Dev 1, Class=root_hub, Drv=ohci_hcd/2p, 12M /: Bus 03.Port 1: Dev 1, Class=root_hub, Drv=ohci_hcd/2p, 12M /: Bus 02.Port 1: Dev 1, Class=root_hub, Drv=ohci_hcd/2p, 12M |_ Port 1: Dev 2, If 0, Prod=, Class=HID, Drv=usbhid, 1.5M /: Bus 01.Port 1: Dev 1, Class=root_hub, Drv=ehci_hcd/6p, 480M |_ Port 3: Dev 3, If 0, Prod=External HDD, Class=stor., Drv=usb-storage, 480M Port 1 is a USB mouse, running at 1.5Mbps. It is an old USB 1.1 device. Port 3 is a hard disk, Hi-Speed device, running at 480Mbps. What does you webcam show? 12 or 480? Andrew _______________________________________________ pwc mailing list pwc@lists.saillard.org http://lists.saillard.org/mailman/listinfo/pwc
