QVideoWidget in QDialog does not show / crashes (macOS) when shown twice

Steps to reproduce

• Download test.mp4 and build qtbug113498.zip
• Run qtbug113498 passing path to test.mp4 on cmd line
• Press Show
• Close the dialog
• Press Show again
• Expected: Video is playing
• Actual: Blank window/crash

In my app, I have a tutorial window based on QDialog which has short, looping video clips demonstrating app features. For video playback, I'm using QMediaPlayer connected to a QVideoWidget. When I first display the tutorial window, everything works correctly, but if I close the tutorial window and try to reopen it, the program crashes with a SIGSEGV. Some notes about the error:

• Whenever the video is first shown, the following text is printed to the console:

failed to get textures for frame true

• If I attach a debugger (PyCharm), it does not halt on the line which causes the error.
• Occasionally (but not always) I will get a stack trace alongside the segfault (see attached). This indicates an exception inside the private QVideoWindow class that QVideoWidget uses.

I have attached an example Python script which reproduces the error that I'm experiencing. The included video is just for testing. Changing the video does not change the error.

I have marked this issue as being in PySide, but I also tested against PyQt6 just to make sure. It shows the same crashing problem. Thinking this might indicate a library issue, I ported my minimal example to C++ (also attached). Curiously, this example does not crash. Instead, the dialog successfully reopens, but is blank until I resize it or move it to another monitor, at which point the video shows up. So I don't know what to make of this.