[osg-users] osgmovie - ffmpeg or Gstreamer

Andrea Martini martini.andrea at gmail.com
Mon Jun 25 05:18:10 PDT 2018

some further details about GSTREAMER Plugin. My goals is to play video using osgmovie and gstreamer as plugin.

I downloaded following gstreamer installers:


(in order to get both runtime and compile time files).

After settings CMAKE (see picture attached), and set the environment variables: 

SET GST_PLUGIN_PATH=C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0
SET GSTREAMER_DEP=C:\gstreamer\1.0\x86_64\bin;C:\gstreamer\1.0\x86_64\lib\gstreamer-1.0;%GST_PLUGIN_PATH%

I compiled OSG solution with gstreamer plugin. All works fine. I get osgdb_gstreamerd.dll and osgdb_gstreamer.dll

To test gstreamer plugin with osgmovie, i used a test movie with ogg extension (i used VLC for converting test video file). First of all, i copied and renamed osgdb_gstreamer(d).dll  to osgdb_ogg(d).dll

To be sure gstreamer was installed correctly, i tested gstreamer with this test video file (ogg) with the following pipeline:

gst-launch-1.0.exe filesrc location=C:/SVILUPPO/CommonData/Movie/surf360converted.ogg ! oggdemux ! theoradec ! videoconvert ! autovideosink

and all works fine.

Now the problem. 

When i use osgmovie, i get the following message:

Error reading file C:\SVILUPPO\CommonData\Movie\surf360converted.ogg: file not handled
Unable to read file C:\SVILUPPO\CommonData\Movie\surf360converted.ogg

In debug, i noticed that in GStreamerImagestream.cpp, 
(GStreamerImageStream::open method )  the _width and _height attribute are equal to 0, and the method returns false.

 // sink

    GstElement *sink = gst_bin_get_by_name(GST_BIN(_pipeline), "sink");

    g_signal_connect(sink, "new-sample", G_CALLBACK(on_new_sample), this);
    g_signal_connect(sink, "new-preroll", G_CALLBACK(on_new_preroll), this);


    gst_element_set_state(_pipeline, GST_STATE_PAUSED);
    gst_element_get_state(_pipeline, NULL, NULL, GST_CLOCK_TIME_NONE); // wait until the state changed

	//gchar* message = gst_error_get_message(error->domain, error->code);

    if (_width==0 || _height==0)
        // no valid image has been setup by a on_new_preroll() call.
        return false;

  // setLoopingMode(osg::ImageStream::NO_LOOPING);
  // start the thread to run gstreamer main loop


It seems that these two attributes are modified by callback on_new_preroll, but i can't access to this function during debug.

Is this approach correct to play video with gstreamer? Does it exist a simpler way?

Thank you!


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