[Qt-interest] Phonon - access video frames

[Martin Schröer]

What about speed ? Is this approach fast enough to do that real time 
drawing on the vid frames,
like i described in the former posts ?

Richard schrieb:
> 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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