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@jsulm Thanks! In MakeFile we see -O2 -MD CXXFLAGS = -nologo -Zc:wchar_t -FS -Zc:rvalueCast -Zc:inline -Zc:strictStrings -Zc:throwingNew -permissive- -Zc:__cplusplus -Zc:externConstexpr -O2 -MD -std:c++17 -utf-8 -W3 -w34100 -w34189 -w44996 -w44456 -w44457 -w44458 -wd4577 -wd4467 -EHsc $(DEFINES)

@ChrisW67 If you overlay a transparent widget on top of the MPVWidget, you will notice that you see the background color of the MVPWidget instead of the video. I believe this is for the same reason as the immediate display of the video's background when using hide(). [image: 48735235-13b2-4d75-a8ec-88e575a81d3d.png] [image: 7d5439dc-94b3-4a73-9dfa-08269b744cba.png]

@sierdzio OK, thanks again. I will mark this question solved.

@Kronam Usually it should work. Try rebuild instead of build.

@SamiV123 this is a very good point. I will consider avoiding plugins at all costs. Maybe it is a better idea to forget about the launcher application and just make separate applications.

@Ioneater Thank you for your information. I just created dummy QQuickWindow and called setGraphicsApi as you suggested. By calling graphicsApi before creating the first QQuickWidget, my problem has been solved. I also found a straightforward method not using dummy QQuickWindow by setting the QSG_RHI_BACKEND environment variable. Have a nice day.

@RahibeMeryem said in QThread signal-slot or zeromq is better for multiply connection to same Thread: @SGaist 25 fps two stream and 2Mp mp4 What exactly does that mean ? You seem to have more that two streams. Also, what are the properties of these streams and what are you using to read them in your Qt application ? Somehow signal slots mechanism looks stuck.. I can post full cod eif you needed No, if anything post a minimal compilable application that shows the behaviour.

@Stecco Thanks stecco, I was unable to run the latest versions of qtcreator and after running your suggestion (sudo apt-get install -qq libglu1-mesa-dev libx11-xcb-dev '^libxcb*') everything got solved.

@Pl45m4 said in Request help: I do, :)

@Saymyname So your case would become: connect(this, &MyClass::fooSig, this, &MyClass::fooSlot); Don't you think this is nicer? It is also checked at compile time, so you will get a compilation error if the signal or slot does not exist or does not take the right arguments.

@jsulm can you help me to solve this: https://forum.qt.io/topic/150794/qml-graph-glitch

For your setup involving a Qt application and a PHP web page, using a database seems like the smoother path. Your web page can retrieve data as needed, while you maintain data consistency by syncing the database with your QList in the Qt app. This way, both your Qt app and web page stay on the same page with the data.

@JonB I saw that thread, but here I'm not using an explicit query. I'm using the QSqlTableModel - not sure if I can change something here (i.e. call QSqlQuery::exec() with a pre-built string instead of using QSqlQuery::prepare()). How to investigate on MySQL side? I checked /var/log/mysql/error.log but there are no entries. How to exclude it does not depend on my Qt code?

@friendlyQtBeginner I guess you should connect to videoFrameChanged() signal as described in documentation to make sure there actually is a frame when you call videoFrame: "QVideoSink will provide individual video frames to the application developer through the videoFrameChanged() signal." You can also call https://doc.qt.io/qt-6/qvideoframe.html#isValid to check whether you got a valid frame.

@JacobNovitsky I'm just guessing that this is what you are looking for: QProcess and start the terminal with your OS specific command (you didn't mention your OS)

They are somewhere inside the build folder - no need to know the location exactly since cmake is doing the correct things.