QMediaCaptureSession capture from QGraphicsScene?

davecotter

If i have a QGraphicsScene (not necessarily connected to a view, or if required, an OFFSCREEN view), can i set its output as the input to a QMediaCaptureSession?

I see i can connect a QWindowCapture, but must that window be showing? can that window be invisible? eg: h.264 output in the background, unrelated to the showing (visible) windows?

I had asked this question a couple years ago, but times have changed and i wonder if it is now possible?

if it is not possible from QGraphicsScene directly, then how about a temporary buffer of QImage? Can i feed QMediaCaptureSession a QImageCapture class, then feed the QImageCapture class a series of QImage or QVideoFrame refs?

is there sample code for sending in-memory images into QMediaCaptureSession ?

davecotter

from @artem.dyomin :

In 6.8, we added QVideoFrameInput, and QAudioBufferInput, which can be connected to QMediaCaptureSession as inputs.

Note you cannot set QGraphicsScene as an input to QMediaCaptureSession. Instead, you may render QGraphicsScene to QImage, construct QVideoFrame from the image, and send your sequence of images to QVideoFrameInput, (which is connected to QMediaCaptureSession).

from @jøger.hansegård :

The current tests for encoding audio and video can be seen at this link. You may want to look at all the files in the test's directory

In an earlier version of the tests, the usage pattern is a bit more explicit.

davecotter

@SGaist do you have any ideas?

SGaist

Hi,

What exactly do you want to record ?

davecotter

the output of the QGraphicsScene, frame by frame, into an h.264 file (ie: export movie of generated frames) @SGaist

davecotter

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davecotter