Is this expected?

[franchan]

Hello,

I was writing/running some simple unit tests for a gstreamer application.
Suddenly I could not instantiate the playbin pipeline.

init gstreamer
deinit gstreamer

init gstreamer
try to make playbin -> fails

I made a basic application to show what goes wrong.
Setting GST_DEBUG enough high shows a silly warning:
the second init of gstreamer emits: "already inited"
Yes but after the first init I deinit ...

You might wonder why the heck do so many init/deinits:
It is due to a fixture of each test case/suite ...

#include <gst/gst.h>
#include <iostream>

int
main(int argc, char* argv[])
{
    if ( FALSE == g_thread_supported() )
    {
        g_thread_init(NULL); // threads were not initialized yet
    }

    GstElement*   mPipeline;

    GError* vGErr = NULL;
    gboolean vGST_InitResult;
    vGST_InitResult = gst_init_check(&argc, &argv, &vGErr);
    std::cout << "vGST_InitResult:" << vGST_InitResult << std::endl;
    gst_deinit();

    vGST_InitResult = gst_init_check(&argc, &argv, &vGErr);
    std::cout << "vGST_InitResult:" << vGST_InitResult << std::endl;
    gst_deinit();

    vGST_InitResult = gst_init_check(&argc, &argv, &vGErr);
    std::cout << "vGST_InitResult:" << vGST_InitResult << std::endl;
    //gst_deinit();

    mPipeline = gst_element_factory_make("playbin", "player");
    std::cout << "mPipeline:" << mPipeline << std::endl;

    return 0;
}

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[Wim Taymans]

On Tue, 2008-08-05 at 17:23 +0200, franchan wrote:

> Hello,
>
> I was writing/running some simple unit tests for a gstreamer application.
> Suddenly I could not instantiate the playbin pipeline.
>
> init gstreamer
> deinit gstreamer
>
> init gstreamer
> try to make playbin -> fails
>
> I made a basic application to show what goes wrong.
> Setting GST_DEBUG enough high shows a silly warning:
> the second init of gstreamer emits: "already inited"
> Yes but after the first init I deinit ...

You can't use GStreamer anymore after calling gst_deinit(). From the
docs:

 * gst_deinit:
 *
 * Clean up any resources created by GStreamer in gst_init().
 *
 * It is normally not needed to call this function in a normal
application
 * as the resources will automatically be freed when the program
terminates.
 * This function is therefore mostly used by testsuites and other memory
 * profiling tools.
 *
 * After this call GStreamer (including this method) should not be used
anymore.


Wim

>
> You might wonder why the heck do so many init/deinits:
> It is due to a fixture of each test case/suite ...
>
> #include <gst/gst.h>
> #include <iostream>
>
> int
> main(int argc, char* argv[])
> {
>     if ( FALSE == g_thread_supported() )
>     {
>         g_thread_init(NULL); // threads were not initialized yet
>     }
>
>     GstElement*   mPipeline;
>
>     GError* vGErr = NULL;
>     gboolean vGST_InitResult;
>     vGST_InitResult = gst_init_check(&argc, &argv, &vGErr);
>     std::cout << "vGST_InitResult:" << vGST_InitResult << std::endl;
>     gst_deinit();
>
>     vGST_InitResult = gst_init_check(&argc, &argv, &vGErr);
>     std::cout << "vGST_InitResult:" << vGST_InitResult << std::endl;
>     gst_deinit();
>
>     vGST_InitResult = gst_init_check(&argc, &argv, &vGErr);
>     std::cout << "vGST_InitResult:" << vGST_InitResult << std::endl;
>     //gst_deinit();
>
>     mPipeline = gst_element_factory_make("playbin", "player");
>     std::cout << "mPipeline:" << mPipeline << std::endl;
>
>     return 0;
> }
>
> -------------------------------------------------------------------------
> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
> Build the coolest Linux based applications with Moblin SDK & win great prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
> http://moblin-contest.org/redirect.php?banner_id=100&url=/
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

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