How to use a Video Producer to write on frames being displayed?

davecotter

i saw that, but what i need is some sample code. it's not immediately obvious how to hook it up. or rather: it's no obvious after several hours of reading, researching, googling, and trying a dozen things.

davecotter

also, i'm not using QML, so that doesn't apply to me. if it DOES apply, then the structure of that sentence does NOT make that clear.

I miss "Inside Macintosh", the quality of that documentation has never been surpassed.

davecotter

if it helps, here's some code that i have, i just can't figure out how to shoehorn the video producer thing in there:

	QGridLayout		*layout = new QGridLayout;
	QTimer			*timer = new QTimer(this);
	
	//AddSurface<Widget>(this, layout, timer, "Native", columnI++);
	//AddSurface<GLWidget>(this, layout, timer, "OpenGL", columnI++);

#if 1
	{
		#if OPT_MACOS
			CFileRef		movieFile(CFileRef::kFolder_DESKTOP);
		#else
			CFileRef		movieFile("Z:\\Users\\davec\\Desktop");
		#endif
		
		ERR(movieFile.GetChild("Movies/test.mp4", &existsB));
		
		if (!err && existsB) {
			QMediaPlayer		*mediaPlayer = new QMediaPlayer(NULL, QMediaPlayer::VideoSurface);
			QGraphicsVideoItem	*videoItem = new QGraphicsVideoItem();
			QGraphicsView		*graphicsView = new QGraphicsView(new QGraphicsScene(this));
			QSizeF				vidSize(340, 200);
			
		    videoItem->setSize(vidSize);
		
			#if 0	
				mediaPlayer->setVideoOutput(videoItem);
			#else
				MyVideoSurface		*vidSurfaceP = new MyVideoSurface();
				MyVideoProducer		*vidProducerP = new MyVideoProducer();

				vidProducerP->setVideoSurface(vidSurfaceP);

				QVideoRendererControl *rendererControl = mediaPlayer->requestControl<QVideoRendererControl *>();
				
				rendererControl->setSurface(vidProducerP);
				
//				mediaPlayer->setVideoOutput(vidSurfaceP);
			#endif
			
			graphicsView->scene()->addItem(videoItem);
			
			SuperString		filePath(movieFile.path(true));
			QUrl			fileUrl(QUrl::fromLocalFile(filePath));

			mediaPlayer->setMedia(fileUrl);
			mediaPlayer->play();
			
			layout->addWidget(graphicsView, 0, columnI++);
		}
	}
#endif

SGaist

What exactly are you trying to do ? Your code is not really clear on the aspect.

davecotter

just insert the video producer into the chain and have the movie still play. the goal is to be able to write to video frames while the movie is playing (eg: put a graphic badge on it, or draw some text over the movie, like subtitles)

SGaist

Then shouldn't you rather make use of video filters ?

davecotter

my app is C++ Widgets, not QML

davecotter

i think it just needs a wee bit more documentation, or better yet, a sample project? anyone?

davecotter

please does ANYONE know how to use this? is there ANY more doc or sample code on this ?

SGaist

After some thoughts, I'd check the VLC-Qt and VLC. I think it will likely be more powerful for the features you are looking for.