Building with Gstreamer on Windows

erikherz

I created a very simple project with one source file (main.cpp) to render video from a Gstreamer pipeline into a QWidget. It builds and runs properly on OSX but not Windows. I tried with Gstreamer MinGW 64 and 32 as well as with MSVC 64. My error is:

Project ERROR: gstreamer-1.0 development package not found

I saw this post: https://forum.qt.io/topic/74652/building-qt-gstreamer ... but before stepping through its recommendations I was hoping to get a more recent update on the correct steps.

Here is my .pro file:

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

DEFINES += QT_DEPRECATED_WARNINGS

SOURCES += \
    main.cpp

HEADERS +=

CONFIG += link_pkgconfig

PKGCONFIG += gstreamer-1.0 \
        glib-2.0 \
        gobject-2.0 \
        gio-2.0

linux {
    PKGCONFIG += gstvideo-1.0
    LIBS += -L/usr/lib/i386-linux-gnu/ -lgstvideo-1.0
}

mac {
    PKG_CONFIG = /usr/local/bin/pkg-config
    PKGCONFIG += gstreamer-video-1.0
}

win32 {
    INCLUDEPATH += c:/gstreamer/1.0/x86_64/include \
                   c:/gstreamer/1.0/x86_64/lib/gstreamer-1.0/include \
                   c:/gstreamer/1.0/x86_64/include/gstreamer-1.0 \
                   c:/gstreamer/1.0/x86_64/include/glib-2.0 \
                   c:/gstreamer/1.0/x86_64/include/glib-2.0/glib \
                   c:/gstreamer/1.0/x86_64/include/glib-2.0/include


    DEPENDPATH += c:/gstreamer/1.0/x86_64/lib/

    LIBS += -Lc:/gstreamer/1.0/x86_64/lib
    LIBS += c:/gstreamer/1.0/x86_64/lib/glib-2.0.lib
    LIBS += -lglib-2.0 -lwinpthread -lgstreamer-1.0 -lgobject-2.0 -lgmodule-2.0 -lgthread-2.0

    CONFIG += c:/gstreamer/1.0/x86_64/lib/pkgconfig
}

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

Here is main.cpp

#include <QApplication>
#include <QFrame>
#include <QTimer>
#include <QDebug>
#include <QLabel>
#include <QWidget>
#include <QVBoxLayout>
#include <gst/gst.h>

#include <gst/video/videooverlay.h>

/* added to work on OSX */
#ifdef __APPLE__
#ifdef TARGET_OS_MAC
#include <glib/deprecated/gthread.h>
#endif
#endif

void gst(int argc, char *argv[]) {
if (!g_thread_supported ())
     g_thread_init (NULL);

   gst_init (&argc, &argv);
   QApplication app(argc, argv);
   app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit ()));

   GstElement *pipeline =
           gst_parse_launch
           (
               "videotestsrc is-live=true ! glimagesink",
           NULL);
    GstElement *sink  =  gst_bin_get_by_name(GST_BIN(pipeline), "sink");

   // prepare the ui

    QWidget window;

    QLabel *label = new QLabel("Hi");
    QWidget *widget = new QWidget();
    WId xwinid = widget->winId();
    gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (sink), xwinid);

    QVBoxLayout qboxLayout;
    qboxLayout.addWidget(label);
    qboxLayout.addWidget(widget);
    window.setLayout(&qboxLayout);

    window.resize(320, 240);
    window.show();

   //WId xwinid = label2->winId();
   //gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (sink), xwinid);

   // run the pipeline

   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);
     // Exit application
     QTimer::singleShot(0, QApplication::activeWindow(), SLOT(quit()));
   }

   int ret = app.exec();

}

int main(int argc, char *argv[])
{
    gst(argc, argv);
}

SGaist

Hi and welcome to devnet,

Might be a silly question but do you have the pkg-config files for GStreamer on Windows ?

erikherz

Great to meet you!

Here are my pkg-config files for "gstreamer":

C:\Users\vivoh>C:\gstreamer\1.0\x86_64\bin\pkg-config.exe --list-all | findstr gstreamer
gstreamer-gl-1.0           GStreamer OpenGL Plugins Libraries - Streaming media framework, OpenGL plugins libraries
gstreamer-tag-1.0          GStreamer Tag Library - Tag base classes and helper functions
gstreamer-net-1.0          GStreamer networking library - Network-enabled GStreamer plug-ins and clocking
gstreamer-sdp-1.0          GStreamer SDP Library - SDP helper functions
gstreamer-1.0              GStreamer - Streaming media framework
gstreamer-bad-audio-1.0    GStreamer bad audio library, uninstalled - Bad audio library for GStreamer elements, Not Installed
gstreamer-allocators-1.0   GStreamer Allocators Library - Allocators implementation
gstreamer-player-1.0       GStreamer Player - GStreamer Player convenience library
gstreamer-insertbin-1.0    GStreamer Insert Bin - Bin to automatically and insertally link elements
gstreamer-plugins-base-1.0 GStreamer Base Plugins Libraries - Streaming media framework, base plugins libraries
gstreamer-codecparsers-1.0 GStreamer codec parsers - Bitstream parsers for GStreamer elements
gstreamer-base-1.0         GStreamer base classes - Base classes for GStreamer elements
gstreamer-app-1.0          GStreamer Application Library - Helper functions and base classes for application integration
gstreamer-webrtc-1.0       GStreamer WebRTC - GStreamer WebRTC support
gstreamer-check-1.0        GStreamer check unit testing - Unit testing helper library for GStreamer modules
gstreamer-controller-1.0   GStreamer controller - Dynamic parameter control for GStreamer elements
gstreamer-video-1.0        GStreamer Video Library - Video base classes and helper functions
gstreamer-sctp-1.0         GStreamer SCTP Library - SCTP helper functions
gstreamer-fft-1.0          GStreamer FFT Library - FFT implementation
gstreamer-mpegts-1.0       GStreamer MPEG-TS - GStreamer MPEG-TS support
gstreamer-pbutils-1.0      GStreamer Base Utils Library - General utility functions
gstreamer-rtp-1.0          GStreamer RTP Library - RTP base classes and helper functions
gstreamer-rtsp-1.0         GStreamer RTSP Library - RTSP base classes and helper functions
gstreamer-riff-1.0         GStreamer RIFF Library - RIFF helper functions
gstreamer-audio-1.0        GStreamer Audio library - Audio helper functions and base classes
gstreamer-plugins-bad-1.0  GStreamer Bad Plugin libraries - Streaming media framework, bad plugins libraries
gstreamer-rtsp-server-1.0  gst-rtsp-server - GStreamer based RTSP server

and glib:

C:\Users\vivoh>C:\gstreamer\1.0\x86_64\bin\pkg-config.exe --list-all | findstr glib
gio-2.0                    GIO - glib I/O library
glib-2.0                   GLib - C Utility Library
json-glib-1.0              JSON-GLib - JSON Parser for GLib.
libsoup-2.4                libsoup - a glib-based HTTP library
taglib                     TagLib - Audio meta-data library
gio-windows-2.0            GIO Windows specific APIs - Windows specific headers for glib I/O library

SGaist

Since you are using the full path to the executable, did you modify the PATH environment variable in the Build part of the Project panel so that it can be found by qmake ?

Did you also try it set the PKG_CONFIG_PATH environment variable ?

erikherz

This is what I now have. Please suggest the value for the PKG_CONFIG_PATH variable. Also please confirm that I should be doing with this with Gstreamer MinGW-64. Finally, please help me understand why Windows is asking for this: "Project ERROR: gstreamer-1.0 development package not found" while it builds fine on MacOS. It looks like they have the same pkg-config gstreamer libs.

Thank you!

SGaist

@erikherz said in Building with Gstreamer on Windows:

PKG_CONFIG_PATH

should contain paths to folder containing .pc files.

Just an educated guess but pkg-config was likely not developed with Windows in mind when it was released.

erikherz

OK. I found it here:
C:>dir "C:" /s /b /d | find ".pc"
...
C:\gstreamer\1.0\x86_64\lib\pkgconfig\x264.pc
C:\gstreamer\1.0\x86_64\lib\pkgconfig\zlib.pc
... etc
and set it here but got the same error:
..

SGaist

Did you also modify the PATH environment variable so that pkg-config can be found by Qt Creator ?

erikherz

Done. Same error.

erikherz

I did not build qt-gstreamer on any platform. It compiled as-is on Linux and MacOS with the Gstreamer installs but perhaps I need to build an install this as per this article?

https://forum.qt.io/topic/74652/building-qt-gstreamer

SGaist

Path contains a folder list, not full executable path.

There's no need to build QtGstreamer which is deprecated by the way.

erikherz

Path updated. Still no luck.

SGaist

Did you force a re-run of qmake after these modifications ?

erikherz

According to this article, yes:
https://forum.qt.io/topic/34055/how-does-qtcreator-know-when-to-re-run-qmake/5

I re-started QT Creator and made a point of changing the .pro file. It re-parse and reset.

... same error.

erikherz

I did a clean install of QT Creator with the MSVC Gstreamer installers and got past that initial error. Now my error is in the Gstreamer integration code. I consider this progress!
Screen Shot 2020-03-13 at 9.40.18 AM.png

erikherz

Making some progress. Now it is compiling after I added:

LIBS += -lgstvideo-1.0

Now we are trying to get gstreamer to find its own plugins:

14:31:17: Starting C:\GIT\build-slim-Desktop_Qt_5_14_1_MinGW_64_bit-Debug\slim.exe ...

(slim.exe:4476): GStreamer-WARNING **: 14:31:24.371: Failed to load plugin 'C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0\gstopenh264.dll': 'C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0\gstopenh264.dll': The specified procedure could not be found.

(slim.exe:4476): GStreamer-WARNING **: 14:31:25.826: Failed to load plugin 'C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0\gstsrt.dll': 'C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0\gstsrt.dll': The specified procedure could not be found.
WARNING: no real random source present!
14:31:30: C:\GIT\build-slim-Desktop_Qt_5_14_1_MinGW_64_bit-Debug\slim.exe exited with code 1

erikherz

This does the trick for making sure that Gstreamer finds its own plugins:

erikherz

Also here is my win32 block in my .pro file for reference:

win32 {
    INCLUDEPATH += \
                   c:\gstreamer\1.0\x86_64\include \
                   c:\gstreamer\1.0\x86_64\lib\gstreamer-1.0\include \
                   c:\gstreamer\1.0\x86_64\include\gstreamer-1.0 \
                   c:\gstreamer\1.0\x86_64\include\glib-2.0 \
                   c:\gstreamer\1.0\x86_64\include\glib-2.0\glib \
                   c:\gstreamer\1.0\x86_64\include\glib-2.0\include


    DEPENDPATH += c:\gstreamer\1.0\x86_64\lib

    LIBS += -Lc:\gstreamer\1.0\x86_64\lib
    LIBS += c:\gstreamer\1.0\x86_64\lib\glib-2.0.lib
    LIBS += -lglib-2.0 -lwinpthread -lgstreamer-1.0 -lgobject-2.0 -lgmodule-2.0 -lgthread-2.0
    LIBS += -lgstvideo-1.0

    CONFIG += c:\gstreamer\1.0\x86_64\lib\pkgconfig
}

SGaist

Looks like pkg-config did not work correctly but still... the manual way did work !

Glad you found a way and thanks for sharing !

erikherz

Also for Windows, I needed to use d3dvideosink or autovideosink rather than glimagesink

It builds and renders the Gstreamer sample video.

Now my issue is getting it to stay within the application window rather than popping out into its own new window.

I got this error:

** (slim_qt.exe:5908): CRITICAL **: 16:15:15.218: gst_video_overlay_set_window_handle: assertion 'overlay != NULL' failed

So I added:

    qDebug() << "slim_qt:gst() xwinid = " + QVariant(xwinid).toString();

and got this:

"slim_qt:gst() xwinid = 1770362"

So I am wondering why gst_video_overlay_set_window_handle failed.