I am new to Qt GUI development. I have installed Qt GUI on windows platform. I need to setup a Qt C++ based GUI application to run connected USB camera. I tried to find out the related example but mostly based on webcam application. Is there any suggested example for accessing USB camera via Qt C++ GUI, I can go through?
There is no essential difference between "webcam" and "usb camera". A webcam is a video camera that feeds or streams an image or video in real time. This means that your USB camera can be a webcam if it supports such a function.
To accomplish your task, use the qt documentation and it's perfect examples, like this camera example.
Also, could be useful:
Recording Video from USB Cam with Qt5
Camera Overview
Related
I have been working with Qt and Kinect v1 for couple of weeks. I don't know how to create a screen inside a Qt GUI and show stream video captured by Kinect.
I have searched for a in-depth tutorial in the Internet but it seems like nothing related directly to my problem.
I prefer programming in C++, using Qt 5.6. I know how to use some basic Qt feature but have never experienced with OpenGL in qt before. I can also run Kinect using Developer Toolkit browser and it works perfectly. Then I saw a tutorial using kinect and C++ at the link: https://homes.cs.washington.edu/~edzhang/tutorials/kinect/kinect2.html.
I followed the instructions and I can create a new windows show the stream video captured by Kinect sensor but when I using the same code in the Qt project, it just only show a black video. I don't know how to resolve the problem at all. The code is too long because I write it in the project created last week.
I am using ffmpeg to record a video from a connected camera. I would like to be able to retrieve the supported camera resolution and framerate. Unfortunately this is currently not supported in ffmpeg on OSX. Are there other solutions out there? I've searched google and stackoverflow but the best I could find was a solution for windows using dshow.
I imagine this is possible with avfoundation but I don't have any experience with it. I am also using qt (not quicktime, the qt framework) so it would have to be compatible with that. :)
Thank you for your time.
In Qt (starting from 5.3 version) you have QCamera
foreach (const QCameraInfo &cameraInfo, QCameraInfo::availableCameras()) {
QCamera *camera= new QCamera(cameraInfo);
QMediaRecorder *recorder = new QMediaRecorder(camera);
// DO queries on QMediaRecorder
}
You can check here the QMediaRecorder docs
Moreover here is an introduction.
I'm developing an application that loads frames from an ethernet camera and displays these frames in an element within a Qt QWebView.
So I would like to ask, which is the best or the most efficient way to display images in sequence from the camera, so that it would display as a live video for the user.
I was planning to use Qt to record video/audio and to show the camera view while it is recording. However, there is a bug report with recording videos on Windows, as reported in this page, and I confirmed that the issue is legitimate. There wasn't any problem with recording video and audio on Macintosh and Linux-Ubuntu.
Due to this issue with Qt, I'm looking for another C++ library that does video and audio recording and can display the camera view. It will be great if it is easy to use and integrate into my project.
I am trying to write a simple program for taking photos from the webcam using Qt.
There is an example project in the Qt Creator, where QCamera is used to take photos and record video. But it is not working the right way. I can't get supported resolutions of the camera using method QCameraImageCapture::supportedResolutions(). A null QList object is returned, and camera is always capturing images with 640x480 resolutions.
OS is Ubuntu 11.04. Same problem occurs on Windows XP.
Can anyone help me?
I have answered nearly the same question.
https://stackoverflow.com/a/21140214/2452081
In short:
Portable solution can be gstreamer, but if Windows DirectShow solution is enough for you download my code from here