How to record video as soon as application started?

[hix_boz]

@jsulm

Qt Creator 4.13.1
Based on Qt 5.15.1 (GCC 5.3.1 20160406 (Red Hat 5.3.1-6), 64 bit)

[Christian Ehrlicher]

@hix_boz said in How to record video as soon as application started?:

QOverload

I got an error like "no template named 'QOverLoad'"

QOverload != QOverLoad - please post the real code and the real error message.

[hix_boz]

@Christian-Ehrlicher
Do you ask to share all prject files when you say real code? Here the errors I got.

Additionaly, I took the error handler connect snippet from Qt camera example which is working with my Qt version.

[jsulm]

@hix_boz said in How to record video as soon as application started?:

Do you ask to share all prject files when you say real code?

No, your connect statement.
As @Christian-Ehrlicher pointed out it is QOverload NOT QOverLoad...

And the version you posted only says something about Qt version used to build QtCreator, not Qt version you're using...

[hix_boz]

@jsulm

After commanding "qmake --version" from terminal, I got this one.

QMake version 3.0
Using Qt version 5.5.1 in /usr/lib/x86_64-linux-gnu

I also typed "qtdiag" and the first line of response like below.

Qt 5.5.1 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 5.4.0 20160609) on "xcb"

I tried either QOverLoad and QOverload and still got an error. As I said before, I took the connect part from camera example which has worked and I did not change anything. They used "QOverload" in connect line.

[jsulm]

@hix_boz According to Qt5.5 documentation (https://doc.qt.io/archives/qt-5.5/qmediarecorder.html#error-1):

connect(mediaRecorder, static_cast<void(QMediaRecorder::*)(QMediaRecorder::Error)>(&QMediaRecorder::error),
    [=](QMediaRecorder::Error error){ /* ... */ });

[Christian Ehrlicher]

@hix_boz said in How to record video as soon as application started?:

I tried either QOverLoad and QOverload and still got an error

No - there must be at least another error message, please post the error message when you use the correct function QOverload

[hix_boz]

@jsulm

It worked like this,

connect(mediaRecorder, static_cast<void(QMediaRecorder::*)(QMediaRecorder::Error)>(&QMediaRecorder::error),
         [=](QMediaRecorder::Error error){  qDebug() << mediaRecorder->errorString(); });

The error I got ,
"Service has not been started" .

Also the below message I keep getting.
(videoPlayer:9057): GStreamer-CRITICAL **: gst_mini_object_unref: assertion 'mini_object != NULL' failed

[Bonnie]

I think you should connect to the QCamera::statusChanged signal, and start the recorder after the status becomes QCamera::ActiveStatus (maybe also stop it when it is non-active).

[hix_boz]

@Bonnie
It works, thanks you so much.