>> I would suggest looking at Brian's dynamictext filter, but
>> it may take some additional effort to get the gdk/pango thing working
Right now I can't try this plugin since I installed mlt with the ubuntu
synaptic manager...and my version of mlt is 0.6.2. But may be I should try
to compile the last version...I am just afraid of messing up and having no
mlt version working. I think I will try to compile the last version of
mlt++ on a virtual ubuntu machine with virtual box.
>> I am using Qt to draw on
>> the video image. Also, it does not need a composite transition, but
>> the text for that is very specific to that effect.
I am not sure of what you are talking about ? Are you saying that I could
draw every frame of a producer with Qt ? or I could draw onto the qt widget
?
>> FYI, distort=1 is a dangerous approach. It depends on how you generate
>> the SVG, but the name "distort" is intentionally dangerous sounding.
I took that from open shot xml. I don't really know what it is, but without
that the movie doesn't have the right size I want.
>> Change the 50 to 100.
Yeah I tried that as I tried 0 but either I only see my text with a black
background or I only see the movie.
If I remove geometry I only see the text with a black background while the
movie is playing. I don't understand that since the image has a transparent
background.
2012/2/14 Dan Dennedy <[email protected]>
> On Tue, Feb 14, 2012 at 7:56 AM, bettinger cédric <[email protected]>
> wrote:
> >>> Only the kdenlivetitle producer loads kdenlivetitle xml, but you
> >>> created a color producer.
> >
> > Ok I didn't know that. Finally I couldn't fint out how kdenlive add text
> to
> > a video, but I think I alsmot understood how open shot does.
> > Now I created an svg image with text and a transparent background and I
> load
>
> For the application you described, do you really want to generate SVG
> for each text item? Same thing could be said for kdenlivetitle. Even
> if you can embed the XML within MLT XML, it seems a rather bloated
> approach. I would suggest looking at Brian's dynamictext filter, but
> it may take some additional effort to get the gdk/pango thing working
> across platforms. For the new vqm transition, I am using Qt to draw on
> the video image. Also, it does not need a composite transition, but
> the text for that is very specific to that effect. (Just thinking
> aloud here about best approach for you.)
>
> > it with a producer. I just have a problem with the composite transition.
> I
> > have been able to mix a movie with a text. But I don't get the expected
> > results : either I just see the text or with the geometry property I see
> the
> > text with transparence.
>
> Text with transparency sounds like a good thing.
>
> > Here is my code :
> >
> > void MainWindow::openVideo(){
> > QString fileName = QFileDialog::getOpenFileName(this);
> > if(!fileName.isNull()){
> > Mlt::Producer *producer = new Mlt::Producer(*m_profile,
> > fileName.toUtf8().constData());
> > if(producer->is_valid()){
> > m_playlist = new Mlt::Playlist();
> > Mlt::Producer *subTitleProducer = new Mlt::Producer(*m_profile,
> > "cedric_01.svg");
> > Mlt::Transition *transition = Mlt::Factory::transition(*m_profile,
> > "composite", NULL);
> > //I tried to change some propertie according to
> what
> > I can see in the kdenlive or open shot xml when I add a composition.
> > Mlt::Properties *prop = new
> Mlt::Properties(transition->get_properties());
> > prop->set("geometry", "0=0%/0%:100%x100%:50");
>
> The "50" at the end of that property value means 50% opacity.
>
> > prop->set("distort", 1);
>
> FYI, distort=1 is a dangerous approach. It depends on how you generate
> the SVG, but the name "distort" is intentionally dangerous sounding.
>
> > prop->set("fill", 1);
> > m_playlist->append(*subTitleProducer, 0, 400);
> > m_playlist->append(*producer, 0);
> > m_playlist->mix(0, 400, transition);
> > m_consumer->stop();
> > m_consumer->connect(*m_playlist);
> > delete m_producer;
> > m_producer = producer;
> > /*
> > m_consumer->start();
> > play();
> > }
> > }
> > m_consumer->set ("refresh", 1);
> > }
> >
> > So when I open a video, I hear the sound directly. If I remove the
> geometry
> > propertie, from the frame 0 to 400 I only see my svg image (my image is
> some
> > text over a transparent background but I got a black background) and
> then I
> > see the movie that already started playing. I feel that the transparence
> of
> > the svg file is not take into account.
>
> I suppose the composite transition does not have a good default here.
> I will look into it soon.
>
> > Otherwise with the geometry propertie, I can see the movie and the text
> but
> > the text is with 50% of transparence and the movie seems a little more
> > darker.
> >
> > May be someone know how I could do that properly ?
>
> Change the 50 to 100.
>
> > Thank you,
> >
> > Cédric
> >
> >
> > 2012/1/31 Dan Dennedy <[email protected]>
> >>
> >> On Sun, Jan 29, 2012 at 10:30 AM, bettinger cédric <[email protected]>
> >> wrote:
> >> > Hello,
> >> >
> >> > I am trying to figure out how I could add some text to a video I am
> >> > playing
> >> > in a qt widget. I am trying to add some text to a video I am reading
> >> > from
> >> > the frame 100 to 324.
> >> > Here is a part of my code :
> >> > void MainWindow::openVideo(){
> >> > QString fileName = QFileDialog::getOpenFileName(this);
> >> > if(!fileName.isNull()){
> >> > Mlt::Producer *producer = new Mlt::Producer(*m_profile,
> >> > fileName.toUtf8().constData());
> >> > if(producer->is_valid()){
> >> > m_playlist = new Mlt::Playlist();
> >> > m_playlist->append(*producer);
> >> > m_consumer->stop();
> >> > m_consumer->connect(*m_playlist);
> >> > delete m_producer;
> >> > m_producer = producer;
> >> >
> >> > //*//Adding subtitle
> >> > Mlt::Producer *subTitleProducer = new Mlt::Producer(*m_profile,
> >> > "color:");
> >> > char* subTitleData = "<kdenlivetitle width=\"1920\" height=\"1080\"
> >>
> >> Only the kdenlivetitle producer loads kdenlivetitle xml, but you
> >> created a color producer.
> >>
> >>
> >> > out=\"324\"><item z-index=\"0\" type=\"QGraphicsTextItem\"><position
> >> > x=\"220\" y=\"105.5555555555556\">
> >> > <transform>1,0,0,0,1,0,0,0,1</transform>
> >> > </position> <content font-color=\"255,0,0,255\"
> >> > font-outline-color=\"0,0,0,255\" font-pixel-size=\"100\"
> >> > font-italic=\"0\"
> >> > font-underline=\"0\" font-weight=\"50\" font=\"Sans Serif\"
> >> > font-outline=\"0\">SOME TEXT THAT WILL BE SUBTITLES</content> </item>
> >> > <startviewport rect=\"0,0,1920,1080\"/> <endviewport
> >> > rect=\"0,0,1920,1080\"/> <background
> >> > color=\"0,0,0,0\"/></kdenlivetitle>\"";
> >> > subTitleProducer->set("xmldata", subTitleData);
> >> > Mlt::Transition *transition = new Mlt::Transition(*m_profile,
> >> > "Composite");
> >> > transition->connect(*m_playlist, 1, 0);
> >> > m_playlist->insert_at(100, subTitleProducer);
> >> > //*///End adding subtitle
> >> > m_consumer->start();
> >> > play();
> >> > }
> >> > fps = m_producer->get_fps();
> >> > }
> >> > // If file invalid, then on some platforms the dialog messes up SDL.
> >> > m_consumer->set ("refresh", 1);
> >> > }
> >> >
> >> > You can see my entire code here :
> >> >
> >> >
> http://code.google.com/p/testqtmlt/source/browse/trunk/08subtitleAndEncodage?spec=svn21&r=21
> >> >
> >> > What I don't understand is how to connect a transition and especially
> >> > what
> >> > are the integers a_track and b_track and if m_playlist->insert_at(100,
> >> > subTitleProducer); is the right thing to do.
> >> >
> >> > Someone know how I could do it right ?
> >>
> >> You need to learn how to prototype compositions with melt and/or xml
> >> possibly using the demos and other tools like OpenShot or Kdenlive to
> >> see how they compose things. Then, you may want to look at the code of
> >> producer_melt.c to see how it uses the API to "connect a transition."
> >> Even I do these things; I do not do everything from memory.
> >>
> >>
> >> --
> >> +-DRD-+
> >
>
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