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Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 6.3.0 Beta2, 6.4.0 Beta1
Affects Version/s: 6.2.3
Component/s: Multimedia
Labels:
None
Environment:
Windows 10

Platform/s:

Windows
Commits:
8afe5d160c (qt/qtmultimedia/dev) 02e96fca6c (qt/qtmultimedia/6.3) eb47e12fd8 (qt/qtmultimedia/6.2) 1f9c392668 (qt/qtmultimedia/dev) dc879d2ad2 (qt/qtmultimedia/6.3) 14758a8ea3 (qt/qtmultimedia/6.2) 14758a8ea3 (qt/qtmultimedia/6.2.4)

There is a regression from Qt 6.2.2 - video is not rendered at all (always black frames) when OpenGL RHI backend is used.

    QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGL);

Most probably caused by https://codereview.qt-project.org/c/qt/qtmultimedia/+/383609.

There are also runtime warnings during video playback

Could not register D3D9 texture in OpenGL
Texture from QVideoFrame is 0, this cannot be right
Failed to initialize QRhiTexture wrapper for native texture object 0
Could not register D3D9 texture in OpenGL
Texture from QVideoFrame is 0, this cannot be right
Failed to initialize QRhiTexture wrapper for native texture object 0
Could not register D3D9 texture in OpenGL
Texture from QVideoFrame is 0, this cannot be right
Failed to initialize QRhiTexture wrapper for native texture object 0
...

This is critical for apps that use QtWebEngineQuick because it hardcodes QSGRendererInterface::OpenGL internally.