[Qt-interest] video streaming what any suggestions?

[Giancarlo Amati]

Many thanks for the answer...the only solution I will use is using OPENCV as a library to connect the video device and see where a can get.

Many regards.
Giancarlo amati

> CC: ilferraresebono at hotmail.it; kkrizka at gmail.com
> From: Trent at Tuggle.org
> To: qt-interest at trolltech.com
> Subject: Re: [Qt-interest] video streaming what any suggestions?
> Date: Wed, 13 May 2009 13:25:30 -0400
> 
> I've had the same problem recently.
> 
> Unfortunately, my solution was to create my own video interface layer,  
> based on Quicktime.
> 
> I chose Quicktime because I needed as close as I could get to a stable  
> cross-platform solution.  VLC/GStreamer/etc. would have been options,  
> but I've been burned in the past with long-term architectural changes  
> and maintenance of APIs with open source video projects.
> 
> I first built a simple layer to abstract and control the video, then  
> wrote two implementations -- one which opens video files on-disk, the  
> other which opens video-input devices.  Output is by emitting  
> frameChanged() signals, which allow the client to obtain the current  
> QImage of the frame.  To draw to screen, I just use a QLabel and  
> setPixmap().  Video files on-disk work on both Windows and Mac, but  
> video-input devices are only supported by Quicktime on Mac, AFAIK.
> 
> It took me about a week.  Overall, it was pretty simple -- the hardest  
> part was learning the old C interface to Quicktime, and getting that  
> right for cross-platform (well, Windows+Mac) use.
> 
> Unfortunately, I cannot release my source code at this time... but I'm  
> still checking licensing options, so I'll let you know.
> 
> -Trent Tuggle
> 
> 
> On May 12, 2009, at 8:56 PM, Karol Krizka wrote:
> 
> > Giancarlo Amati wrote:
> >> Hello everybody,
> >>
> >> I have to write donw a software and I wish to use QT as a GUI. now,
> >> the software has to connect to a video camera connected by a
> >> USB/Firewire port and shows the video steaming as well as saving  
> >> frames.
> >>
> >> Sorry to bother u with this question but does QT have any class
> >> devoted to video management? I heard about Phonon, but yet don't
> >> understand if it is just for playing a videoclip or also to show up a
> >> video streaming...from a camera.
> >>
> > I remember some discussion about that a while ago on this list, so I
> > suggest you look in the archives. I don't remember the overall
> > conclusion, but I understand that at the current moment it is  
> > impossible
> > to play camera streams with Phonon. However, there is some VLC library
> > that will allow you to do it inside Qt.
> >
> > --
> > Cheers,
> > Karol Krizka
> > http://www.krizka.net
> > _______________________________________________
> > Qt-interest mailing list
> > Qt-interest at trolltech.com
> > http://lists.trolltech.com/mailman/listinfo/qt-interest
> 

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