I've had mixed experiences with overlays, it all depends on the platform and
where you insert yourself into it. (DirectX is bad)
I would try to avoid capturign/displaying QImages and QPixmaps. I'd try to keep
it all in YUV, includign your overlay, for easy merging that can be done on a
OpenCL implementation. However, if on a Linux you might get it for essentially
free by sticking widget on top of the video widget and making sure they are
both GL implemented.
________________________________
From: Josiah Bryan <[email protected]>
To: Lopes Yoann <[email protected]>
Cc: Tom Isaacson <[email protected]>; "[email protected]"
<[email protected]>
Sent: Thursday, April 3, 2014 11:27 AM
Subject: Re: [Interest] Creating a video feed or overlay
Lopes -
I did a lot of live video work using Qt in a project I have on Google code:
https://code.google.com/p/livepro/
I havn't tried it with Qt 5+, but it was all with Qt 4.8.
Let me know if you have any questions on that if you actually do look at any of
the code.
Thanks!
-Josiah
On Mon, Mar 31, 2014 at 6:52 AM, Lopes Yoann <[email protected]> wrote:
>On Mar 28, 2014, at 7:41 PM, Tom Isaacson wrote:
>
>> I'm working on an app that reads data from a sensor then displays it on a
>> graph using qwt. This part is working fine but what we want to do now is
>> create a video feed of the graph that can be displayed in other apps. We'd
>> also like to add the graph as an overlay to a video feed from a camera. Is
>> either of these possible in Qt, and if so where do I start?
>
>
>Qt is probably not the best solution to do this. You could get the raw video
>frames from the camera (using QCamera and QVideoProbe/QAbstractVideoSurface);
>if the frame is in RGB, you could easily convert it to a QImage and then use
>QPainter to draw the graph over it. From there you'll have to find another
>solution to set up a live feed from these frames, since Qt Multimedia doesn't
>provide any API to encode and stream video.
>
>Using GStreamer directly (we use it as backend on Linux) would probably be a
>better choice.
>
>However, for the app displaying the video feed, Qt is a perfect fit.
>QMediaPlayer or the QML MediaPlayer accept any URL.
>
>--
>Yoann Lopes
>
>_______________________________________________
>Interest mailing list
>[email protected]
>http://lists.qt-project.org/mailman/listinfo/interest
>
--
Josiah Bryan
765-215-0511
[email protected]
_______________________________________________
Interest mailing list
[email protected]
http://lists.qt-project.org/mailman/listinfo/interest
_______________________________________________
Interest mailing list
[email protected]
http://lists.qt-project.org/mailman/listinfo/interest
