How to debug Gstreamer on Windows

[David Ing]

It can't find the gstreamer plugins plugins.

On the build machine, you can probably run `gst-inspect-1.0 videotestsrc`
and it shows you where the plugins can be found.

I am willing to bet you did not package the plugin binaries with your
deployable.  You need to package the binaries and then tell gstreamer where
to look for them.

I have a bit of initialization code that I run when my program starts.

if (!_initialized)
{
    boost::filesystem::path pluginFolder = assemblyFolder / "plugins";

    // WARNING: setting an environment variable is only safe at the
beginning of the program (before any
    // other threads have been spun up).  We do this to maintain strict
control over the plugins that we
    // are using.
    const char* priorGstPluginPath = g_getenv("GST_PLUGIN_PATH");
    std::string gstPluginPath = string::unwiden(pluginFolder.string());
    if (priorGstPluginPath)
    {
        char c = priorGstPluginPath[0];
        if (c != 0)
        {
            gstPluginPath = gstPluginPath + PATHS_SEP_STR +
priorGstPluginPath;
        }
    }

    g_unsetenv("GST_PLUGIN_SYSTEM_PATH_1_0");
    g_unsetenv("GST_PLUGIN_SYSTEM_PATH");
    g_unsetenv("GST_PLUGIN_PATH_1_0");
    g_unsetenv("GSTREAMER_ROOT_X86_64");
    g_setenv("GST_PLUGIN_PATH", gstPluginPath.c_str(), true);
    g_setenv("GSTREAMER_1_0_ROOT_X86_64",
string::unwiden(assemblyFolder.string()).c_str(), true);

    //  Initialize gstreamer
    gst_init(pnargs, pargs);

    //  Guard against initializing more than once.
    _initialized = true;
}


On Mon, Mar 30, 2020 at 8:19 AM erikherz <erik at vivoh.com> wrote:

> Looking at the debug output, I see:
>
> GST_ELEMENT_FACTORY gstelementfactory.c:444:gst_element_factory_make:
> gstelementfactory: make "videotestsrc" "(NULL)"
> GST_ELEMENT_FACTORY gstelementfactory.c:142:gst_element_factory_find: no
> such element factory "videotestsrc"
>
> GST_ELEMENT_FACTORY gstelementfactory.c:444:gst_element_factory_make:
> gstelementfactory: make "d3dvideosink" "(NULL)"
> GST_ELEMENT_FACTORY gstelementfactory.c:142:gst_element_factory_find: no
> such element factory "d3dvideosink"
>
> The app runs on the same machine and shows the video test pattern when I
> launch it from QT Creator but not when I deploy it as a stand-alone
> application (using windeployqt.exe and copying over all of the Gstreamer
> libraries).
>
> Here is the full output file (GST_DEBUG=*:7):
> https://customers.vivoh.com/all/mini_app_out_mar_30_2020.txt
>
> I posted the source code to a very small QT sample application that
> reproduces the problem here:
> https://forum.qt.io/topic/112384/building-with-gstreamer-on-windows/28
>
>
>
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
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