webcam

I'm using OpenCV 2.3 to capture video from two webcams on a Linux computer(Ubuntu 10.04) which only has one USB hub. I'm getting an error "videoc_streamon: No space left on device" when cv.QueryFrame is called for the second camera the first time and "vidioc_qbuf: invalid argument" on subsequent calls. I know that this is a USB bandwidth issue, so I tried lowering the resolution to 320 x 240 with cv.SetCaptureProperty, which appears to not change anything (confirmed by a call to cv.GetCaptureProperty). What I need is some way to lower the bandwidth the cameras are using so that I can get

My Apologies for the generality of the question. I have tried many things but nothing seems to work. I have a server? (let's call it Server A ) that resides in a local area network where there is also an IP-Webcam. That webcam is constantly providing an RTSP feed on the address... let's say... rtsp://192.168.1.50:554/cam.sdp . The camera doesn't have access to the outside world (it must stay in the LAN, and therefore, only has access to server A , no to server B ), but server A does. Sadly, Server A doesn't have a public IP, so I can not reach into Server A from anywhere in the world. Server A

EDIT: The first answer solved my problem. Apart from that I had to set the ASI_BANDWIDTH_OVERLOAD value to 0. I am programming a Linux application in C++/Qt 5.7 to track stars in my telescope. I use a camera (ZWO ASI 120MM with according SDK v0.3) and grab its frames in a while loop in a separate thread. These are then emitted to a QOpenGlWidget to be displayed. I have following problem: When the mouse is inside the QOpenGlWidget area, the displayed frames get corrupted. Especially when the mouse is moved. The problem is worst when I use an exposure time of 50ms and disappears for lower

Context: I'm building an offline website (html5, css, js) which i want to call over IE (11). For taking/saving a picture i need to access the webcam. Approach: I read that IE doesn't support the getUserMedia; and the only way is to use flash. Question: Is the only possibility to access the webcam over IE by using flash? If yes, please recommend an example. I'd appreciate your input. Yes IE 11 and below currently doesn't support getUserMedia ,but there is a polyfill available on github, which you can find here It uses flash fallback in case getUserMedia is unavailable so you can give it a try.

I need to know if there's a way to know if the user has a webcam on his computer using javascript or maybe php. There is a plugin: http://www.xarg.org/project/jquery-webcam-plugin/ if(webcam.getCameraList().length == 0){ alert('You don\'t have a web camera'); } if(confirm('Do you have a webcam?')) { //they said yes :-) } else { //they said no :-( } Muhammet was right. First need to add the plugin http://www.xarg.org/project/jquery-webcam-plugin/ Then you'll need to start the plugin: $("#camera").webcam({ width: 320, height: 240, mode: "callback", swffile: "/lorran/jscam_canvas_only.swf",

I need to get a regular snapshot from a webcam in Delphi. Speed is not a problem (once a second is fine). I have tried demo code from based on stuff from http://delphi.pjh2.de but I can't get it to work. It compiles and runs OK but the callback function never fires. I don't have a real webcam but am running instead a simulator. The simulator works (I can see the video using Skype) but not with the test app. I don't really know where to start looking... Can anyone be bothered to try this code? (Apologies for the voluminous post - couldn't find how or if you can attach files - a zip file is