[SOLVED]Can't set output location for QMediaRecorder

igor64

Hi everybody!

I am trying to save video from my camera into the file but I can't set the output location. The method SetOutputLocation always returns FALSE.
Bellow is the code:

@
QCamera * camera;
QMediaRecorder * rec;

QApplication app(argc, argv);


camera = new QCamera;

camera->setCaptureMode(QCamera::CaptureVideo);

camera->start();

rec = new QMediaRecorder(camera);

QString file = "D:\\qt\\test\\test.avi";

QFile file1(file);

file1.open(QIODevice::WriteOnly);

rec->setOutputLocation(QUrl::fromLocalFile(file));
@

What should I do to fix this problem?

Thanks in advance.

Igor

[edit: please add @ tags around your code for better readability, Eddy]

stevenceuppens

I Quickly tested your code on mac, and it works..

I guess i has something todo with the filePath

can your try:

@QString file = QCoreApplication::applicationDirPath() + "/testings.avi";@

igor64

I tried as you wrote. No change.

igor64

I checked:

camera->isCaptureModeSupported(QCamera::CaptureVideo);

and it returned False.

Could it be the reason? I use simple web camera. Are these methods camera dependent?

And if the camera is the reason, what kind of camera should I have to have in order to do this?

stevenceuppens

i tested your code on Mac, and it worked out of the box with my build in camera...

What platform do you use ?

igor64

Windows XP 2002, SP3.

stevenceuppens

Did you compile directshow plugin ?

http://qt-project.org/forums/viewthread/19150

igor64

No, I didn't. I installed QtCreator and that's all. Where can I get this plugin and what should I do to compile it?

igor64

Beacuse I couldn't make it work with QCamera and QMediaRecorder, I installed OpenCV. I typed the code:

@
#include "opencv2/highgui/highgui.hpp"
#include <iostream>

using namespace cv;
using namespace std;

int main(int argc, char* argv[])
{
VideoCapture cap("clock.avi"); // open the video file for reading
if ( !cap.isOpened() ) // if not success, exit program
{
cout << "Cannot open the video file: " << endl;
waitKey(20000);
return -1;
}

}
@

And the story is the same: "Cannot open the video file".

I tried this on 2 different computers (win7, xp) and the result is the same. I installed on both computers the same QT creator.

Maybe is something wrong with my installation of the QT. Some rights, pathes, environment variables, ...

Any ideas?

[edit: added coding tags "@" SGaist]

igor64

Hi!

I think I found the reason why it doesn't work: codecs. Some files I can read (CRAM codec), most of them I don't. And these things work better with opencv than with QMediaRecorder. So, I need more knowledge on codecs. If anyone knows where to get a good tutorial on using video codecs I would be very grateful.
stevenceuppens:: Thank you for your help.

Bye