RTSP seek issue with custom client

[suspension]

Hi

I have set-up a generic gstreamer client using the below code. It accepts a
pipeline in the gst-launch format and runts the pipeline in a separate
thread. I have removed some code that are related to setting a custom window
handle because I thought it has nothing to do with the issue I am facing
now.

Basically, the run method spawns a separate thread which starts in the
function playback. This function uses the passed pipeline to create gst
pipeline and set its state to GST_STATE_READY. The thread that calls run
(which is the program's main thread) sets the pipeline status to playing
after pipeline is started. The same thread at a later time calls
gst_element_seek_simple with a valid time to seek the position. This call
almost always result in a hang in both the client and the server. However if
I use gst-play-1.0 as the client seek works. What am I doing wrong here?

void playback(int argc, char* argv[])
{
    std::cerr << "starting loop thread" << std::endl;
    GError* error = NULL;

    /* init */

    gst_init(&argc, &argv);

    std::cerr << "gst init done" << std::endl;
    loop = g_main_loop_new(NULL, FALSE);
    if (loop == NULL) {
        std::cerr << "Failed to create the main loop" << std::endl;
        loop_error = true;
        return;
    }

    std::cerr << "gst creating loop done" << std::endl;
    pipeline = gst_parse_launch(argv[1], &error);
    std::cerr << "gst pipeline parsed" << std::endl;

    if (pipeline == NULL || error != NULL) {
        std::cerr << "Failed to create the pipeline" << std::endl;
        loop_error = true;
        return;
    }

    gst_element_set_state(pipeline, GST_STATE_READY);

    std::cerr << "gst pipeline created" << std::endl;
    done = true;
    std::cerr << "gst starting the pipeline loop" << std::endl;
    g_main_loop_run(loop);
    std::cerr << "gst pipeline loop exited" << std::endl;
}


int run(int argc, char* argv[])
{ 
    std::thread playback_thread(playback, argc, argv);

    std::cerr << "Waiting for the loop to be ready" << std::endl;
    // wait until loop
    while (!done) {
        std::this_thread::sleep_for(std::chrono::microseconds(1000000));
    }

   // after sometime set the status to playing 
   gst_element_set_state(pipeline, GST_STATE_PLAYING);


    // wait for a user command to seek
   GstSeekFlags flags = GST_SEEK_FLAG_FLUSH;            
   gst_element_seek_simple(pipeline, GST_FORMAT_TIME, flags, GST_SECOND *
seek_pos);
}



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