edit retag flag offensive close merge delete add a comment 2 answers Sort by » oldest newest most voted 3 answered 2013-02-11 04:41:47 -0500 tuner 116 ●2 ●8 I had the Polling v. The easiest fix is to put them on two different USB 2.0 hosts. When trying to run 2 at 160x120, some of them would work fine together and some gave the memory error. http://answers.ros.org/question/12582/usb_cam-vidioc_streamon-error-28/
If anyone is interested in this feature then I will attempt to get the uvcvideo maintainers to consider the "compression" factor concept. I know this is due to the bandwidth limitations of two cameras on one USB hub. Downvote to get the correct answer up and because insufficient space was ruled out in the comments. –tuner Jan 29 '13 at 17:26 add a comment| up vote -1 down vote
Using "están" vs "estás" when refering to "you" Why does the kill-screen glitch occur in Pac-man? These other reccomendations are not working! Found out a lot about my camera, and was able to fix the issue. Top rauppe31 I'm New!
I've got problems with FOURCC - it isn't implemented. Ioctl(vidioc_streamon): No Space Left On Device A crossword so simple, it practically solves itself How to defeat the elven insects using modern technology? CPU usage with 3*c270 is fairly reasonable on a wdr3600: Mem: 50600K used, 75444K free, 320K shrd, 3436K buff, 8800K cached CPU: 16% usr 27% sys 0% nic 45% idle 0% share|improve this answer answered Jan 11 '13 at 13:53 Mike 662 Thanks, that explains it all. –lexma Jan 13 '13 at 9:25 add a comment| Your Answer draft
Most likely this is because the resolution, framerate and protocol used by your cameras overloads the USB 2.0 connection. ar_sys how to run Help !!! [closed] Running 2 different cameras using usb_cam How to get pointcloud2 data from usb_cam or Pointgrey camera? share|improve this answer answered Sep 27 '12 at 23:38 Tim Williscroft 3,3601630 add a comment| up vote 1 down vote this works as charm for me sudo rmmod uvcvideo sudo modprobe Positional Bathroom Etiquette How do really talented people in academia think about people who are less capable than them?
How to defeat the elven insects using modern technology? https://forum.synology.com/enu/viewtopic.php?t=49790&start=45 My webcams of choice have been the Logitech C500 and the Logitech C270, and I found that the image produced by the C500 at 1280x1024 is 100kbytes and the image produced Uvcvideo Quirks=128 But I don't know how :\ (read my post in this thread for more details)fliker09( 2013-03-18 08:32:09 -0500 )editStarting from 2.4.6 where is no more need for this dirty workaround, CV_CAP_PROP_FPS V4l2 What monitoring or debuging tools I should use?
Checkout this link to see how to add this to your module conf so that changes become permanent. If you run 'lsusb -v', you can search for the camera, and often find a number of things like: Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 4 bNumEndpoints 1 Using multiple webcams which support MJPEG or some other form of compression will work fine. where is that parameter set?- Then, launch my code and/or the dual luvcview applications, and whenit doesn't work, check the kernel log...
Lets see if that's the case. Many USB 3.0 controllers require specific drivers. Also try otherapplications (luvcview, guvcview, cheese, ....)I have tried running two instances of luvcview, two instances ofguvcview, one of each, one of either and one of cheese, to no avail.When I Be sure to switch to tab "video & files" - there you can change the frame rate, pixel format and other things related to the format.
It is a "little hacky" in that I used the priv attribute in the struct v4l2_pix_format to specify the value. Should the sole user of a *nix system have two accounts? If you are plugging them into a USB 3.0 port then make sure you install drivers for those.
Sometimes, real fast is almost as good as real time. Using v4l2-ctl I discovered one of my cameras did not support any compressed video modes. Can なし be used in response to a binary question? I open up the first stream fine, and when I open the second camera stream, I get an error that there is no space left on the device.
You can see the video card allotment via the command line on Ubuntu via cat /sys/kernel/debug/usb/devices | grep "B: " You might have to use sudo depending on distro. The problem with some logitech cameras, though, is that they will always allocate as much as they can get (480 mbps), disregarding of mode. You can check what modes your cameras support by running the following command: v4l2-ctl -d /dev/video0 --list-formats Which should output something like this. Getting the exact settings to work with OpenCV is a different story though.
You likely mean GB or GiB. –Brian Cain Jul 9 '12 at 14:17 add a comment| 5 Answers 5 active oldest votes up vote 8 down vote This is a badly DSM 4.0-2198with theQuickCam Express - Logitech, IncQuickCam USB cameraquickcam: Sensor HDCS-1000/1100QuickCam for Notebook Deluxe - Logitech, IncUSB GSPCA cameraCamera type JPEGSensor HV7131R(c)Soc PC-Camera - Pixart Imaging, IncWith Firefox, I seehttp://diskstation:5000/webman/3rdparty ... Thanks for the information. I think it's time to buy a new webcam.
Thanks everybody (and anybody that can help)! Granted, these webcams cost $3/each, so I guess I got what I paid for. –Cerin Apr 17 '15 at 13:54 add a comment| up vote 4 down vote The answer is I connect Logitech B910 and Logitech C910 webcams to usb. I am a starting pythonprogrammer with not much experience (Ubuntu is great that way, it justworks...
I have had no response from a maintainer. The reality is that the USB bus bandwidth calculation is based on the overly-sized estimate from the device, and is already leaving some extra bandwidth, and so you could probably hack Greetings Jo Top goetz Knowledgeable Posts: 336 Joined: Wed Mar 18, 2009 10:05 pm Location: Berlin, Germany Re: USB Webcam support package Quote Postby goetz » Tue Apr 10, 2012 2:23 You will need to use the latestdriver version from linuxtv.org for that.First of all, thanks to Paulo for explaining to me this process step-by-step.After installing the driver from the linuxtv.org hg
Some logitech cameras have usb bandwidth allocation bug. edit flag offensive delete link more CommentsI checked and it is running at USB 2.0 speeds.