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[solved] media_player_gst changing defualt file location

edited October 2014 in OpenSesame


I recently installed the plugin media_player_gst into OpenSesame (v. 2.8.3) and needed to change the default file location for GStreamer. The plugin documentation states:

If you needed to install [GStreamer] to a different folder, you will need to edit the variable GSTREAMER_PATH somewhere at the top section of and make it point to the location at which you have installed GStreamer.

However, I am not adept enough with code to find where I need to replace the default path with the real path for GStreamer. I can see, however, that in there is no variable called "GSTREAMER_PATH." Any help resolving this issue would be greatly appreciated.



  • edited 9:32PM


    Judging by media_player_gst's lines 52 to 76, a very decent attempt is made to automatically locate the GST folder wherever it is (assuming you are on Windows). Are you actually experiencing any trouble when using the plug-in?

    If so, could you paste the contents of your Debug Window after a crash?


  • edited 9:32PM


    The issue is that on my work's servers we are only allowed to save software to a certain network drive, which the script would have no reason to look in.

    When I launch OpenSesame and try to add media_player_gst to a new experiment I simply get OpenSesame could not find the GStreamer framework!.

    Any ideas on how to remedy the issue would be appreciated!


  • edited October 2014

    Ah, I see, thanks for the information.

    What I think is going on, is that the environment variable for GStreamer is not set. You can do so manually, by adding in a wee bit of code to the start of the script:

    os.environ["GSTREAMER_SDK_ROOT_X86"] = "C:/example/path/to/GStreamer/dir"

    Obviously, you will have to change the example path to the actual path in your setup.

    Good luck!

    PS: alternatively, you could manually set the path in your Windows setup as well. Follow the instructions on this page, and make sure that the name you use for the environment variable is GSTREAMER_SDK_ROOT_X86, and the value the absolute path to the directory (using backward slashes).

  • edited October 2014

    Thanks for the help! Unfortunately, it appears to be giving me a different error now.

    Failed to load plug-in 'media_player_gst'
    line: 2
    exception message: name 'os' is not defined
    exception type: NameError
    Traceback (also in debug window):
      File "dist\libqtopensesame\", line 1356, in add_item
      File "dist\libopensesame\", line 293, in load_plugin
      File "dist\libopensesame\", line 267, in import_plugin
      File "R:[path]\OpenSesame\plugins\media_player_g\", line 2, in <module>
    NameError: name 'os' is not defined

    Sorry to keep bothering you, but I feel like this is so close to being resolved!


  • edited 9:32PM

    Sorry to keep bothering you, but I feel like this is so close to being resolved!

    It is! os is a Python module that you need to import before you can use it with the following line:

    import os
  • edited 9:32PM

    Thank you both! After adding that one line of code it appears to be up and running!


  • edited 9:32PM

    Oh, sorry, I should have specified to place the line of code after os is imported. Glad you got things up and running!

  • edited November 2014

    Hello OpeSesameTeam,

    I followed the instructions as written here above and still when I run an experiment with xpyriment-gst back-end I get the following:

    Starting experiment as ExperimentProcess-1
    Expyriment 0.7.0 (Revision 7a6b73d; Python 2.7.6)
    File: opensesame.exe (6a8b7f)
    Warning: OpenGL does not support window mode. OpenGL will be deactivated!
    An Exception occurred during exp.end():
    OpenSesame could not find the GStreamer framework!
    OpenSesame could not find the GStreamer framework!

    gstreamer path is: C:/gstreamer-sdk
    in I have added:
    import os (in line 32)
    os.environ["GSTREAMER_SDK_ROOT_X86"] = "C:/gstreamer-sdk" (in line 49) path is: C:\Program Files\OpenSesame\plugins\media_player_gst-master

    Thank you for your time!

  • edited November 2014

    You should not need to manually add the

    os.environ["GSTREAMER_SDK_ROOT_X86"] = "C:/gstreamer-sdk"

    line if the gstreamer framework is installed correctly. The installation process should automatically add this entry to your environment variables. You can check if it is present by going to your system properties windows (or press win key + pause/break) > Advanced System settings > Environment variables. If it isn't there, your installation did probably not complete succesfully. The line should also read something like


    Another thing that I can think of is that the python modules were not selected during installation and thus they are not present to be found by this plugin.
    Let me know if this worked for you somehow.

    Buy Me A Coffee

  • edited 9:32PM

    Hello dschreij,

    thank you very much for your response!
    I checked everything you suggested but nothing could resolve the problem.
    In our experiment we are using sound and that's why I wanted to use xpyriment-gst back-end.
    So, we shall use only "legacy Pygame".
    Thank you again for your time and your suggestions.

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