Re: [Linux-uvc-devel] Framerate of Quickcam Pro 9000
2010/5/7 Laurent Pinchart laurent.pinch...@ideasonboard.com: Laurent, Hi Paulo, On Tuesday 04 May 2010 10:36:19 Paulo Assis wrote: What happens to the camera settings when the computer is rebooted? Are they stored in some non-volatile memory in the camera? That would be awesome. If I'm not mistaken USB keeps the power on, even during a reboot, so the camera should maintain the control settings. I'm not sure that's guaranteed by the USB standard. I believe the camera should be reset when the computer is restarted. Whether it will loose its settings might depend on the camera firmware. In that case it may depend on the motherboard configuration. I've tested this on my pc and the camera kept it's settings. I've had plenty of problems with this in the past, if the camera crashes for some reason, a reboot won't solve it and it may also prevent a normal boot. Just last week I notice that my pc took much longer than usual to boot and it was also much slower, after a little investigation I found that usb audio was the cause, the camera had crash and couldn't be initiated. In any case, there's no non-volatile memory to store the controls in any of the consumer webcams I know of. Yes this is true. Regards, Paulo ___ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
Re: [Linux-uvc-devel] Framerate of Quickcam Pro 9000
Hi Paulo, On Tuesday 04 May 2010 10:36:19 Paulo Assis wrote: What happens to the camera settings when the computer is rebooted? Are they stored in some non-volatile memory in the camera? That would be awesome. If I'm not mistaken USB keeps the power on, even during a reboot, so the camera should maintain the control settings. I'm not sure that's guaranteed by the USB standard. I believe the camera should be reset when the computer is restarted. Whether it will loose its settings might depend on the camera firmware. In any case, there's no non-volatile memory to store the controls in any of the consumer webcams I know of. You would have to unplug the camera to loose the settings. This is not always a good think, sometimes the camera may crash, meaning that you must physically unplug it to make it work again. -- Regards, Laurent Pinchart ___ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
Re: [Linux-uvc-devel] Framerate of Quickcam Pro 9000
Alan Hi, Yes, the profiles are very useful. Your program in general is very useful, I hope you make a stable release soon, some distros only ship release versions of programs (like mine for example). The latest stable release is 1.3.1 (adds camera button support), unfortunately some distros take quite some time to pick new releases (maybe my fault, I usually do a new release every month or so). I wish the command line uvcdynctrl also supported loading/saving profiles (just like alsactl store / alsactl restore). You are free to post a patch for it ;-) I'll add it to debian and send it upstream. I'm afraid in the next few weeks I won't have much spare time, otherwise I could do it myself. If you fell you can't do it, just remember me again in a couple of weeks. What happens to the camera settings when the computer is rebooted? Are they stored in some non-volatile memory in the camera? That would be awesome. If I'm not mistaken USB keeps the power on, even during a reboot, so the camera should maintain the control settings. You would have to unplug the camera to loose the settings. This is not always a good think, sometimes the camera may crash, meaning that you must physically unplug it to make it work again. Best regards, Paulo ___ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
[Linux-uvc-devel] Framerate of Quickcam Pro 9000
I have a problem with my camera: the framerate is too low. I tested the camera using mplayer and motion with different light levels. So I tried to fix it by following the instructions here: http://www.quickcamteam.net/documentation/how-to/how-to-maximize-the-frame-rate Unfortunately its still slow, and I think I messed up something because every time I run uvcdynctrl I get this error: [libwebcam] Unknown V4L2 private control ID encountered: 0x0A046D04 (V4L2_CID_PRIVATE_BASE + 33844484) So I think at some moment I used an invalid parameter, so I thought I could rmmod and modprobe uvcvideo to fix it, but no. Reconnecting the camera doesn't help either. So is this an invalid parameter? If so, where is it stored, in some memory inside the camera? And how do I fix the framerate issue? Thanks! Alan ___ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
Re: [Linux-uvc-devel] Framerate of Quickcam Pro 9000
Alan Hi, Can you test with guvcview (http://guvcview.berlios.de)? Maximum frame rate also depends on the pixel format and resolution, so choose a format and resolution that supports a high frame-rate (e.g m...@800x600) Regards, Paulo 2010/4/29 Alan lameventa...@gmail.com: I have a problem with my camera: the framerate is too low. I tested the camera using mplayer and motion with different light levels. So I tried to fix it by following the instructions here: http://www.quickcamteam.net/documentation/how-to/how-to-maximize-the-frame-rate Unfortunately its still slow, and I think I messed up something because every time I run uvcdynctrl I get this error: [libwebcam] Unknown V4L2 private control ID encountered: 0x0A046D04 (V4L2_CID_PRIVATE_BASE + 33844484) So I think at some moment I used an invalid parameter, so I thought I could rmmod and modprobe uvcvideo to fix it, but no. Reconnecting the camera doesn't help either. So is this an invalid parameter? If so, where is it stored, in some memory inside the camera? And how do I fix the framerate issue? Thanks! Alan ___ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel ___ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
