ASSERT: “m_surface” when playing video

[SGaist]

What is w ?

[matuQt]

w? didn't exist any w in this code. but if your mean is v.
v is QGraphicsVideoItem and mp is QMediaPlayer

[SGaist]

What happens if you start playing only after adding v to the scene ?

[matuQt]

at this time it show me the mention assert error

[SGaist]

Since Qt 5.4 has been released, can you check if you still encounter this problem ?

[matuQt]

yes , i don't have any idea to solve it

[SGaist]

Yes you will test or yes you still have this problem ?

[matuQt]

both, i tested Qt5.4 and the error exist in Qt 5.4

[SGaist]

Where's the assert located this time ?

Did you install the latest driver for your graphic card ?

[matuQt]

i update my graphic card again and the assert error does exist yet :( . what should i do to solve it?

[SGaist]

@
mp.setVideoOutput(&v);
scene->addItem(&v);
@

I'd move that in the constructor, there's no need to do that again each time.