Humor me, will you?

constexpr int poolSize = 16; QVector<QThread *> threadPool(poolSize); QCoreApplication * app = QCoreApplication::instance(); for (size_t i = 0; i < poolSize; i++) { QThread * thread = new QThread(app); thread->start(); QObject::connect(thread, &QThread::finished, thread, &QThread::deleteLater); } QObject::connect(app, &QCoreApplication::aboutToQuit, [threadPool] () -> void { for (QThread * thread : threadPool) { thread->quit(); thread->wait(); } }); int index = 0; for (const QString &video : videoFiles) { ThumbnailExtractor *extractor = new ThumbnailExtractor(counter, folderPath + '/' + video); extractor->moveToThread(threadPool[index++ % poolSize]); QObject::connect(extractor, &ThumbnailExtractor::finished, extractor, &QObject::deleteLater); QMetaObject::invokeMethod(extractor, &ThumbnailExtractor::generateThumbnail, Qt::QueuedConnection); }

A note here:
QMediaPlayer and related classes don't seem to be reentrant so you can't use them from different threads. Stick to the main one.

Here is pretty much the commands I use to deploy the app:

qmake videoplayer/videoplayer.pro -o build/MakeFile -r -spec win32-msvc2010 -nocache jom -f Makefile -s windeployqt --release release

Strange, i'd check if the Windows SDK is installed.

@CAD_coding
form the official document, I think you can do it

Alright if you say it may couse some problems I think I will install it twice.

@mrjj

The QMessageBox shows the same temp. location as i can see when i run set in the commandline. Its the default TempLocation used by Windows ("C:/Users/<USER>/AppData/Local/Temp").
And this piece of code always fails to write to this location on this PC.

I will check for antivirus issues next time when i have access to this PC.

@SGaist So, last week our integrator had a moment of lucidity, and realized that we were actually using a debug-version of moc.exe instead of a release-build...........

I did a quick test with a release build of moc.exe, which took the exact same measurement I mentioned above back to 1m10s, so indeed faster than with the 5.4-version, as you expected.

For b, check whether the library has other dependencies. You might be missing one.

Hi,

To add to @koahnig, it's not a Qt specific problem. Compilers on Windows are not compatible one with the other, so basically you have to ensure that all components of your software are built using the same compiler.

Hi, 32bit Windows 7 Home Edition.

Anyway maybe I found a workaround. In case an error occurs when trying to play the movie, there is a maximum number of retries...
I have done this because my suspect is that, due to the CF-19 "poor" performances, the libraries aren't (fully) loaded when the movie is played.

I will keep you up to date whether this is or this is not THE solution, for anyone else's benefit.

Thanks to everybody!

@theunsheydenrych I rebooted the Windows machine and it was fine again.

Hi @enjoysmath, and welcome to the Qt Dev Net!

Your download mirror might be having problems. You can use this tool to choose a different mirror: https://forum.qt.io/topic/43349/

@SGaist Morning.

Yes I know that this Forum is more Community driven. When I find the time, I will propably ask that on the Mailing List. [Thanks for the direct Link btw]

Have a nice weekend.