使用Qt5录制来自网络摄像头的视频 [英] Record a video from a webcam with Qt5

问题描述

我一直在努力让这个工作2天，我绝望。基本上我想用我的网络摄像头使用Qt5录制视频。我到目前为止，我可以得到一个小部件来显示网络摄像头看到什么，但由于某种原因，当我尝试用QMediaRecorder类记录它不会保存任何东西到outputLocation。

I have been trying to get this to work for 2 days now and I am desperate. Basically I want to record a video with my webcam using Qt5. I got so far that I can get a widget to display what the webcam is seeing, but for some reason whenever I try to record it with the QMediaRecorder class it doesn't save anything to the outputLocation.

创建了输出文件，但包含0个字节。我试着玩视频编解码器的设置，但仍然没有运气。我认为像这样的简单代码会工作：

The output file is created but contains 0 bytes. I have tried playing around with the settings for the video codec, but still no luck. I would think that simple code like this would work:

    QCamera *camera = new QCamera(QCameraInfo::availableCameras().at(0));
    QCameraViewfinder *viewFinder = new QCameraViewfinder(this);
    camera->setViewfinder(viewFinder);
    ui->verticalLayout->addWidget(viewFinder);

    recorder = new QMediaRecorder(camera);
    recorder->setOutputLocation(QUrl(QString("/home/user/test.mp4"))); // removed my name

    camera->setCaptureMode(QCamera::CaptureVideo);
    camera->start();
    recorder->record();

我希望这基本上是为了简单录制到文件。我停止了析构函数中的记录。

I expected this to be basically it for simple recording to a file. I stopped the recording in the destructor. So, the question is, why is this not working?

提前感谢：）

推荐答案

如果你在Windows平台上，这个问题只是因为Qt不支持Windows的视频录制。请查看此 http://doc.qt.io/qt-5/ qtmultimedia-windows.html

If you are on a Windows platform this issue is simply because Qt does not support video recording for Windows. Take a look at this http://doc.qt.io/qt-5/qtmultimedia-windows.html

解决方法是使用此第三方库 https://github.com/kibsoft/QtMEL
我希望Qt尽快做到这一点。祝你好运！

A work around is to use this 3rd-party library https://github.com/kibsoft/QtMEL I hope Qt does something about this soon. Good luck!

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