StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POWhat Qt GUI Containers to use? Also Related Video Display issue - Windows 7
primarykey
Id
14092640
data
AcceptedAnswerId
0
AnswerCount
1
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2012-12-30T17:02:19.497
FavoriteCount
1
LastActivityDate
2013-08-23T06:38:12.837
LastEditDate
2012-12-30T17:22:55.470
LastEditorUserId
1790875
OwnerUserId
1790875
ParentId
0
PostTypeId
1
Score
0
ViewCount
1325
LastEditorDisplayName
text
Body
I am trying to design an application to play multiple video (media) files and allow user modification capability on each one (eg, scaling, rotating, inverting etc of videos). I started by studying <code>Phonon</code>, but after going into it for a while read that it is no longer supported (or its support is doubtful) in >= <code>Qt5</code>. So then i went back and now i'm looking at qtmultimedia - <code>QMediaPlayer</code>. Though I have come from c#-WPF background i have done some earlier work on Qt-C++. But this time I'm stuck and confused on what widgets i must use. <code>QMediaPlayer</code> can show its output (video) on <code>QVideoWidget</code>, <code>QGraphicsVideoItem</code> and <code>QAbstractVideoSurface</code>. Since I need the capabilities of rotation etc, i believe i must incorporate QGraphicsScene/View. <1> So what should the approach be? I did this: used <code>QVideoWidget</code> -> added this to <code>QGraphicsProxyWidget</code> via its <code>setWidget</code>() (though <code>setWidget</code>() takes <code>QWidget</code>* and <code>QVideoWidget</code> is not derived from <code>QWidget</code> as i see in Qt Assistant -- why is this allowed btw?) -> Added this <code>QGraphicProxyWidget</code> to <code>QGraphicsScene</code> via <code>addItem</code>() -> added this <code>QGraphicsScene</code> to <code>QGraphicsView</code> while constructing it -> added <code>QGraphicsView</code> to <code>QMainWindow</code> via <code>setCentralWidget</code>(). Is this fine? When to use <code>QGraphicsVideoItem</code> and <code>QAbstractVideoSurface</code>? <2> When adding multiple <code>QVideoWidget</code> in the following manner i don't see any video or the <code>QVideoWidget</code> itself (i've painted to distinguish it). What am i doing wrong? (there is audio output though): <pre><code> QVideoWidget *pVideoWidget1 = new QVideoWidget(0); pVideoWidget1->setPalette(QPalette(QColor(255,0,0),QColor(0,255,0))); QVideoWidget *pVideoWidget2 = new QVideoWidget(0); pVideoWidget2->setPalette(QPalette(QColor(255,0,0),QColor(0,0,255))); m_pMediaPlayer1 = new QMediaPlayer(this); m_pMediaPlayer2 = new QMediaPlayer(this); m_pMediaPlayer1->setVideoOutput(pVideoWidget1); m_pMediaPlayer2->setVideoOutput(pVideoWidget2); m_pCustomGraphicsProxy1 = new CustomGraphicsProxy(0); //this is just a class derived from QGraphicsProxyWidget to implement drag and drop of videos m_pCustomGraphicsProxy2 = new CustomGraphicsProxy(0); m_pCustomGraphicsProxy1->setWidget(pVideoWidget1); m_pCustomGraphicsProxy2->setWidget(pVideoWidget2); QGraphicsScene *pGraphicsScene = new QGraphicsScene(this); QGraphicsLinearLayout *pGraphicsLinearLayout = new QGraphicsLinearLayout; CustomGraphicsProxy* button = new CustomGraphicsProxy(0); button->setWidget(new QPushButton); //this i can see CustomGraphicsProxy* button1 = new CustomGraphicsProxy(0); button1->setWidget(new QPushButton); //this i can see too pGraphicsLinearLayout->addItem(button); pGraphicsLinearLayout->addItem(m_pCustomGraphicsProxy1); //can't see pGraphicsLinearLayout->addItem(m_pCustomGraphicsProxy2); //can't see pGraphicsLinearLayout->addItem(button1); CustomGraphicsProxy *temp = new CustomGraphicsProxy(0); temp->setLayout(pGraphicsLinearLayout); pGraphicsScene->addItem(temp); temp->show(); m_pGraphicsView = new QGraphicsView(pGraphicsScene, this); setCentralWidget(m_pGraphicsView); QObject::connect(m_pCustomGraphicsProxy1, SIGNAL(sigNewFileDragDropped()), this, SLOT(sloPlayOnWindow1())); QObject::connect(m_pCustomGraphicsProxy2, SIGNAL(sigNewFileDragDropped()), this, SLOT(sloPlayOnWindow2())); //just for testing - this gives only audio no video can be seen m_pMediaPlayer1->setMedia(QUrl::fromLocalFile("d:/z.avi")); m_pMediaPlayer1->play(); </code></pre> <3> Before i study this further, am i choosing the right tools in Qt to manipulate videos as i mentioned before or something else needs to be done?
Tags
<c++><qt5>
Title
What Qt GUI Containers to use? Also Related Video Display issue - Windows 7
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USuser1790875
UserOwnerUserId
1. USuser1790875
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.