Map a QVideoFrame

[maxilase]

Hello Qt experts !

I am having some trouble using an external program (GStreamer1.0) running along with Qt (on windows 7).
I manage to get some frames out of a pipeline using the QImage type like this :

const QImage frame(bufferInfo.data,width,height,myQImageFrameFormat);

const QImage frame(bufferInfo.data,width,height,myQImageFrameFormat);

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Now since Qt 5.5 is release, I would like to do the same but by mapping received frame into a QVideoFrame (since it seems to be the class dedicated to it).
However I'm having some trouble. The documentation says that normally I should be albe to map the "frame buffer" into memory in order to write into it using bits();.

I did a few tries but it seems that the function map:

myVideoFrame->map(QAbstractVideoBuffer::ReadWrite);

myVideoFrame->map(QAbstractVideoBuffer::ReadWrite);

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always give a "false" meaning (I guess) that the mapping into memory has failed.
I really dont know why I have this since the only actions I did on this video frame is

• creating the frame
• Adding metadata
• setting the field type

I don't know if I am too early using this class since Qt5.5 just came out but I did not read anything about being cautious using QVideoFrame and I'm not finding any example on the web.
Thanks in advance for your help !

[maxilase]

Following up my problem I was finally able to map my QVideoFrame by using a local variable instead of a member one.

Now I am getting another problem, since I (normally) have my frame filled up, how do I display it ? One of my problem being that the QVideoFrame::PixelFormat seems not to exist for QImage or QPixmap (QVideoFrame::Format_RGB32).

I was hoping that I could use some kind of QVideoWidget or QMediaPlayerto display my frames but I dont see obvious way to do it...