[Qt-interest] Phonon - access video frames

[Richard]

Hi!
The "m_videoWidget->setAttribute(Qt::WA_DontShowOnScreen);" trick done  
for WebKit is is a "hidden" work around for Qt since Phonon is lacking  
an API for grabbing frames (at the moment). We don't recommend using  
the same work around for others, as support for this might change  
without notice in a future release.

If what you need is to draw overlay, consider putting your video  
widget inside graphics view instead. It will then act as any other  
graphics item, and it should therefore be easy to add any overlay.

-Richard




Den Mar 5, 2009 kl. 8:09 PM skrev Martin Schröer:

> Helder, thanks for your reply.
>
> Another suggestion made was:
>
> QPixmap::grabWidget(QWidget * widget, int x = 0, int y = 0, int width
> = -1, int height = -1)
>
>
> VideoWidget* videoWidget = new VideoWidget(this);
> QPixmap pixmap = QPixmap::grabWidget(videoWidget);
>
> I'm a bit unsure what to do.
> What i want to do is to overlay video frames in realtime, with some
> static contents
> ( like text ) but also with some cursor.
>
> What approach would be the best to achieve that ?
>
>
>
> Helder Correia schrieb:
> On Wed, Mar 4, 2009 at 2:11 PM, Martin Schröer <gordon at gordonswelt.de>
> wrote:
>>> I want to access the video frames of a media played back directly,  
>>> so i can
>>> apply some manipulation to it before it goes to the screen.
>>> May someone give me hints on this ?
>>>
>>
>> Hi Martin. Take a look at
>> src/3rdparty/webkit/WebCore/platform/graphics/qt/ 
>> MediaPlayerPrivatePhonon.cpp
>> Particularly these lines:
>>   m_videoWidget->setAttribute(Qt::WA_DontShowOnScreen);
>>   ...
>>   m_videoWidget->render(painter, QPoint(rect.x(), rect.y()),
>> QRegion(0, 0, rect.width(), rect.height()));
>>
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