Joel Ebel wrote: > Ah. ok. I was under the impression the bug was only in the Fusion. I > like the design of the Fusion, so I guess we'll run with it, and if we > have problems, we'll try the reset patch.
FWIW, I would like to give a quick summary of the worst problems I found when using a Logitech Ultra Vision camera (I suspect others have similar problems): - when using a resolution of 640x480 (I used only uncompressed YUYV format) the camera will basically cut the "effective" resolution in half with frame rates >= 25 fps. - except for 30fps, the frame period is always a multiple of 40 milliseconds. If you request 10fps, for instance, you will get inter-frame periods of 120 -> 80 -> 120 -> 80, etc. - at really high resolutions (1280x960) you get at most 8 fps, and if you request the bayer raw data at 8 bits this will drop to 4 fps or less, i.e., it is slower for the camera to provide raw data than it is to provide "processed" data :P - if you connect to a USB1.1 port the highest uncompressed resolution you will get is ~176x132. - I don't know if this is driver or camera related, but lots of times when the camera is streaming video it fails to set standard controls (brightness, contrast, etc.). - sometimes the camera just stops responding completely and needs to be unplugged and replugged. I guess this is the "firmware hang problem" that is alleviated by the reset patch (which I haven't tried yet). Most of these shouldn't be too bad for "regular" webcam usage, though. BTW, if anyone has different experiences and thinks that I'm doing something wrong in any of the items above, please let me know. -- Paulo Marques Software Development Department - Grupo PIE, S.A. Phone: +351 252 290600, Fax: +351 252 290601 Web: www.grupopie.com _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
