[Qt-interest] help with QtMultimedia

[Anders Bakken]

On Wed, Jul 21, 2010 at 04:06:40AM +0100, Dmytro Poplavskiy wrote:
> Hello Anders,
>
> On Wednesday 21 July 2010 07:59:51 ext Anders Bakken wrote:
> > Apologies if this has been answered before but I couldn't find it by
> > grep'ing through the archives.
> >
> > There seems not to be a whole lot of examples regarding QtMultimedia:
> >
> > I have the following use case:
> >
> > I want to process live video coming in (in MP4 format but I can possibly
> > change that) on a stream and I want to access the raw data of each
> > decoded frame to do some analysis. E.g. in RGBA or YUV or whichever
> > format it comes.
> >
> > Are there APIs in QtMultimedia that could facilitate this kind of
> > operation? Are there any examples?
>
> It's possible to get access to video frames without displaying them using
> QVideoRendererControl.
>
> You have to implement QAbstractVideoSurface (which returns the list of
> video formats you support and receives the video frames)
> and pass it to QVideoRendererControl::setSurface().
>
> The media player backend will pass the video frames to your surface with
> QAbstractVideoSurface::present().
>
> We don't have the good example for this case yet, QGraphicsVideoItem and
> QVideoWidget  do this, but because of their complexity it's not the best
> example.
>
> The code may look like this:
>
> QVideoRendererControl* rendererControl =
>       player->service()->requestControl<QVideoRendererControl*>();
>
> if (rendererControl)
>     rendererControl->setSurface(surface);
>
> player->setMedia(...); //stream uri
> player->play();
>
> Regards
>   Dmytro.

Hi Dmytro

Thanks. I'll give it a shot.

regards

--
Anders Bakken

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