Gstreamer application using Qt
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Hi,
Can anyone help me to know how to create gstreamer pipeline using Qt? Regards, Pushpa |
Re: Gstreamer application using Qt
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Hi Pushpa,
Which Gstreamer bindings did you opt for? regular (C) GStreamer APIs, QtGstreamer, .QtMultimedia/QtMobility... A sample player using QtGstreamer can be found at: http://cgit.freedesktop.org/gstreamer/qt-gstreamer/tree/examples/player/player.cpp Regards, Cedric On Sep 4, 2012, at 7:03 AM, pushpa <[hidden email]> wrote: Hi, _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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Hi Cedric,
Thanks for your response. I am new to Qt, so i dont know much about it. I dont know what is the difference between QtGstreamer, .QtMultimedia/QtMobility... If i want to execute using regular 'C' Gstreamer API's how do i have to ? Regards, Pushpa |
Re: Gstreamer application using Qt
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QtMultimedia/QtMobility is a high level multimedia framework part of the Qt toolkit. It provides a (very) high level API and (AFAIK) does not allow tweaking of the pipeline(s) Direct use of regular GStreamer APIs is also possible. In your .pro file, you would add something like: unix {
CONFIG += link_pkgconfig
PKGCONFIG += gstreamer-0.10
}You can then add the following to your C++ files: #include <gst/gst.h> and I suggest something like below as your first experiment:
Print (or check in your debugger) major, minor, micro values. They should match your GStreamer installation. Hope this helps! Cedric On Sep 4, 2012, at 7:43 AM, pushpa <[hidden email]> wrote: Hi Cedric, _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Gstreamer application using Qt
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If you only need a music/video player or camera capture and
eventually plans to use QML, QtMultimediaKit is your way. you can
implement a player with a single line of QML code...
Video { source: "myvideo.avi" } But if you need more power (custom pipelines, capture from v4l2 generic devices etc.) this is definitively not the way to go: you need to link directly to gstreamer (as per Cedric example). The only side effect is you'll need some "major" tweaks to use it in QML (of course, only if you need it). On 04/09/2012 08:07, Cedric Hombourger
wrote:
_______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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Hi,
Thanks for your comments Luca. @Cedric : I was able to execute gstreamer pipeline. Thanks Cedric. I have one more question... Can we stream a video using qt phonon. Does it support the receive of a rtsp stream and decode and display or do we have to go according to Cedric's way of directly implementing Gstreamer pipeline through Qt Regards, Pushpa |
Re: Gstreamer application using Qt
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Have you tried something like:
MediaObject mediaObject;
mediaObject.setCurrentSource (QUrl ("<a href="rtsp://rtsp-channel/">rtsp://rtsp-channel/.."));On Sep 4, 2012, at 10:29 AM, pushpa <[hidden email]> wrote: Hi, _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
Re: Gstreamer application using Qt
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In reply to this post by Luca Santini
On Tue, 2012-09-04 at 09:01 +0200, Luca Santini wrote:
> The only side effect is you'll need some "major" tweaks to use it in > QML (of course, only if you need it). If you like to look at an example in using gstreamer and QML check out my rtsp radio player, sources are here http://git.tal.org/cgi-bin/gitweb.cgi?p=m3x-oidar.git I can't say if it's the prettiest or best way to do it, but it works for me. -- Kaj-Michael Lang <[hidden email]> _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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I will sure have look at your code Lang
Thanks |
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I tried to execute gstreamer pipeline using Qt and display gstreamer window on Qtwidget. This worked fine on host pc, however did not succeed on my target platform(omap35x).
On target platform, gstreamer window is not showed on Qtwidget, video is displayed on separate window with following messages (gst:1743): GStreamer-CRITICAL **: gst_implements_interface_cast: assertion `gst_element_implements_interface (GST_ELEMENT (from), iface_type)' failed ** (gst:1743): CRITICAL **: gst_x_overlay_set_xwindow_id: assertion `overlay != NULL' failed Here is the code which i am using int main(int argc, char *argv[]) { gst_init (&argc, &argv); QApplication app(argc, argv); app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit ())); GstElement *pipeline = gst_pipeline_new ("xvoverlay"); GstElement *src = gst_element_factory_make ("videotestsrc", NULL); GstElement *sink = gst_element_factory_make ("autovideosink", NULL); gst_bin_add_many (GST_BIN (pipeline), src, sink, NULL); gst_element_link (src, sink); QWidget window; window.resize(320, 240); window.setWindowTitle("Video"); window.show(); gst_element_set_state (sink, GST_STATE_READY); WId xwinid = window.winId(); QApplication::syncX(); gst_x_overlay_set_xwindow_id (GST_X_OVERLAY (sink), xwinid); GstStateChangeReturn sret = gst_element_set_state (pipeline, GST_STATE_PLAYING); if (sret == GST_STATE_CHANGE_FAILURE) { gst_element_set_state (pipeline, GST_STATE_NULL); gst_object_unref (pipeline); QTimer::singleShot(0, QApplication::activeWindow(), SLOT(quit())); } int ret = app.exec(); window.hide(); gst_element_set_state (pipeline, GST_STATE_NULL); gst_object_unref (pipeline); return ret; } |
Re: Gstreamer application using Qt
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On Fri, 2012-09-07 at 00:00 -0700, pushpa wrote:
> On target platform, gstreamer window is not showed on Qtwidget, video is > displayed on separate window with following messages > > (gst:1743): GStreamer-CRITICAL **: gst_implements_interface_cast: assertion > `gst_element_implements_interface (GST_ELEMENT > (from), iface_type)' failed > > ** (gst:1743): CRITICAL **: gst_x_overlay_set_xwindow_id: assertion `overlay > != NULL' failed > > Here is the code which i am using > ... > GstElement *sink = gst_element_factory_make ("autovideosink", NULL); > ... > gst_x_overlay_set_xwindow_id (GST_X_OVERLAY (sink), xwinid); autovideosink does not itself implement/proxy the GstXOverlay interface (see gst-inspect-0.10 autovideosink). If you use autovideosink you will have to handle the prepare-xwindow-id element message on the bus (synchronously!) and set the window ID from there. You could do something like the bus_sync_handler() code in the Gtk+ example in http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstxoverlay.html You don't need to do the realize_cb() thing if you can get the window ID as you do now, just make sure to obtain it in the main thread and safe it somewhere, so that in the sync bus handler, which is called from a streaming thread, you just need to pass the saved number and not need to do any X/Qt calls (which won't work well). Note that with recent versions of playbin2 you can just set the window handle/ID on playbin2 directly using the GstXOverlay interface, and it will proxy it to the video sink. Cheers -Tim _______________________________________________ gstreamer-devel mailing list [hidden email] http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel |
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