QT API changes from Qt 5 (5.12.11) to Qt 6 (6.4.0).

inkfil

Hello Community,
I have an iPadOs application written in Qt 5.12.11, and it has used QVideoFrame API.
now since I have to migrate from Qt 5.12.11 to Qt 6.4.0, when I compile the application, I get error message as follows

/Users/ronakjain/eye/ws640/app/vis.cpp:73:94: error: no member named 'Format_YV12' in 'QVideoFrame'
        QVideoFrame videoframe(y_size + uv_size*2, QSize(width, height), width, QVideoFrame::Format_YV12);
                                                                                ~~~~~~~~~~~~~^
/Users/ronakjain/eye/ws640/app/vis.cpp:74:24: error: incomplete type 'QAbstractVideoBuffer' named in nested name specifier
        videoframe.map(QAbstractVideoBuffer::WriteOnly);
                       ^~~~~~~~~~~~~~~~~~~~~~
In file included from /Users/ronakjain/eye/ws640/app/vis.cpp:1:
In file included from Focus/vis.h:5:
In file included from ../../Qt/6.4.0/ios/include/QtMultimedia/QVideoFrame:1:
../../Qt/6.4.0/ios/include/QtMultimedia/qvideoframe.h:18:7: note: forward declaration of 'QAbstractVideoBuffer'
class QAbstractVideoBuffer;
      ^
/Users/ronakjain/eye/ws640/app/vis.cpp:75:31: error: no matching member function for call to 'bits'
        auto dst = videoframe.bits();
                   ~~~~~~~~~~~^~~~
In file included from /Users/ronakjain/eye/ws640/app/vis.cpp:1:
In file included from Focus/vis.h:5:
In file included from ../../Qt/6.4.0/ios/include/QtMultimedia/QVideoFrame:1:
../../Qt/6.4.0/ios/include/QtMultimedia/qvideoframe.h:88:12: note: candidate function not viable: requires single argument 'plane', but no arguments
      were provided
    uchar *bits(int plane);
           ^
../../Qt/6.4.0/ios/include/QtMultimedia/qvideoframe.h:89:18: note: candidate function not viable: requires single argument 'plane', but no arguments
      were provided
    const uchar *bits(int plane) const;
                 ^
/Users/ronakjain/eye/ws640/app/vis.cpp:22:31: warning: implicit conversion loses integer precision: 'qsizetype' (aka 'long long') to 'int'
      [-Wshorten-64-to-32]
        int y_size = eye_data.size();
            ~~~~~~   ~~~~~~~~~^~~~~~
1 warning and 3 errors generated.

can anyone help me with how the QVideoFrame Object should be initiated with the parameters as per the new Qt API (Qt version 6.4.0)?
Note: I've already tried to go through docs and that seems to have constructors (check below link)
but I want to instantiate QVideoFrame Object with Frame Size, Frame Format, ...

REFERENCES:
https://codebrowser.dev/qt6/qtmultimedia/src/multimedia/video/qvideoframe.h.html

Thanks
Ronak Jain.

Paul Colby

Hi @inkfil,

WriteOnly has moved from QAbstractVideoBuffer::WriteOnly (Qt5) to QVideoFrame::WriteOnly (Qt6). So I guess:

 videoframe.map(QVideoFrame::WriteOnly);

Cheers.

jsulm

@inkfil said in QT API changes from Qt 5 (5.12.11) to Qt 6 (6.4.0).:

/Users/ronakjain/eye/ws640/app/vis.cpp:74:24: error: incomplete type 'QAbstractVideoBuffer'

Include QAbstractVideoBuffer header file in vis.cpp

Paul Colby

@jsulm said in QT API changes from Qt 5 (5.12.11) to Qt 6 (6.4.0).:

Include QAbstractVideoBuffer header file in vis.cpp

QAbstractVideoBuffer was made private in Qt 6.4, so you can't include its header anymore.

Give my earlier suggestion a try:

videoframe.map(QVideoFrame::WriteOnly);

Cheers.

inkfil

@Paul-Colby

 videoframe.map(QVideoFrame::MapMode::WriteOnly);

this worked
but I also have other parameters that I need like Frame Format, ...

can you please help me with that

JonB

@inkfil
At Qt6 all(?) enumerated types have been moved from from a "general, high-level" class/namespace --- like Qt::AlignLeft or QVideoFrame::WriteOnly --- down into a more "specific, low-level" class/namespace --- like Qt::AlignmentFlag::AlignLeft or QVideoFrame::MapMode::WriteOnly. You need to change all your code accordingly. There isn't a definitive list, you just have to find out and do it as necessary.

In https://stackoverflow.com/questions/72086632/migrating-to-qt6-pyqt6-what-are-all-the-deprecated-short-form-names-in-qt5 and/or https://pypi.org/project/PyQtEnumConverter/ somebody wrote some kind of converter for Python/PyQt6 for this, maybe it will give you inspiration to understand what has changed.