When running the tests, the TestSubmission.test_audio test fails, here is the traceback:

Traceback (most recent call last):
  File "/home/tsyesika/mediagoblin/mediagoblin/tests/test_submission.py", line 393, in test_audio
    self.check_normal_upload('Audio', path)
  File "/home/tsyesika/mediagoblin/mediagoblin/tests/test_submission.py", line 127, in check_normal_upload
    **self.upload_data(filename))
  File "/home/tsyesika/mediagoblin/mediagoblin/tests/test_submission.py", line 90, in do_post
    response = self.test_app.post(url, data, **kwargs)
  File "/home/tsyesika/mediagoblin/local/lib/python2.7/site-packages/WebTest-1.4.3-py2.7.egg/webtest/app.py", line 838, in post
    content_type=content_type)
  File "/home/tsyesika/mediagoblin/local/lib/python2.7/site-packages/WebTest-1.4.3-py2.7.egg/webtest/app.py", line 810, in _gen_request
    expect_errors=expect_errors)
  File "/home/tsyesika/mediagoblin/local/lib/python2.7/site-packages/WebTest-1.4.3-py2.7.egg/webtest/app.py", line 1102, in do_request
    res = req.get_response(app, catch_exc_info=True)
  File "build/bdist.linux-x86_64/egg/webob/request.py", line 1313, in send
    application, catch_exc_info=True)
  File "build/bdist.linux-x86_64/egg/webob/request.py", line 1281, in call_application
    app_iter = application(self.environ, start_response)
  File "/home/tsyesika/mediagoblin/local/lib/python2.7/site-packages/WebTest-1.4.3-py2.7.egg/webtest/lint.py", line 179, in lint_app
    iterator = application(environ, start_response_wrapper)
  File "/home/tsyesika/mediagoblin/mediagoblin/app.py", line 342, in __call__
    return self.call_backend(environ, start_response)
  File "/home/tsyesika/mediagoblin/local/lib/python2.7/site-packages/Werkzeug-0.10.4-py2.7.egg/werkzeug/wsgi.py", line 591, in __call__
    return self.app(environ, start_response)
  File "/home/tsyesika/mediagoblin/mediagoblin/app.py", line 276, in call_backend
    return self._finish_call_backend(request, environ, start_response)
  File "/home/tsyesika/mediagoblin/mediagoblin/app.py", line 318, in _finish_call_backend
    response = controller(request)
  File "/home/tsyesika/mediagoblin/mediagoblin/decorators.py", line 47, in wrapper
    return controller(request, *args, **kwargs)
  File "/home/tsyesika/mediagoblin/mediagoblin/decorators.py", line 74, in new_controller_func
    return controller(request, *args, **kwargs)
  File "/home/tsyesika/mediagoblin/mediagoblin/decorators.py", line 47, in wrapper
    return controller(request, *args, **kwargs)
  File "/home/tsyesika/mediagoblin/mediagoblin/decorators.py", line 74, in new_controller_func
    return controller(request, *args, **kwargs)
  File "/home/tsyesika/mediagoblin/mediagoblin/decorators.py", line 103, in wrapper
    return controller(request, *args, **kwargs)
  File "/home/tsyesika/mediagoblin/mediagoblin/submit/views.py", line 73, in submit_start
    user=request.user.username)
  File "build/bdist.linux-x86_64/egg/sqlalchemy/orm/attributes.py", line 316, in __get__
    return self.impl.get(instance_state(instance), dict_)
  File "build/bdist.linux-x86_64/egg/sqlalchemy/orm/attributes.py", line 611, in get
    value = callable_(state, passive)
  File "build/bdist.linux-x86_64/egg/sqlalchemy/orm/state.py", line 442, in __call__
    self.manager.deferred_scalar_loader(self, toload)
  File "build/bdist.linux-x86_64/egg/sqlalchemy/orm/loading.py", line 555, in load_scalar_attributes
    (state_str(state)))
DetachedInstanceError: Instance <LocalUser at 0x7fe7368aa8d0> is not bound to a Session; attribute refresh operation cannot proceed

When attempting to add an audio file, the immediate response is that the submission was successful, but after a minute or two, the Media Processing Panel reports that the upload failed to process. I have attempted this with Ogg/Vorbis, FLAC, and WAV files, with the exact same results. Images do work though; I have not tried other media types.

A screenshot walkthrough is here: ​https://gobblin.se/u/thewayyouwere/collection/mediagobblin-audio-upload-error/

As you can see from the comments of the third image, at least one other user is experiencing this problem as well.

Joar Wandborg has been working on an audio support / content sniffing and negotiation branch for mediagoblin, so this bug's purpose is to track it!