With clean installation (master branch @24.09.2012) file uploading halts on "setting up thumbnailing pipeline" (after transcoding) for any video file type.

Last messages from console log: 2012-09-25 21:11:03,182 DEBUG [mediagoblin.media_types.video.processing] Saving medium... 2012-09-25 21:11:03,185 DEBUG [mediagoblin.media_types.video.processing] Saved medium /opt/mediagoblin/local/lib/python2.7/site-packages/SQLAlchemy-0.7.8-py2.7-linux-x86_64.egg/sqlalchemy/engine/default.py:463: SAWarning: Unicode type received non-unicode bind param value.

param.append(processors[key](compiled_params[key]))

2012-09-25 21:11:03,295 INFO [mediagoblin.media_types.video.transcoders] Video length: 37.431 2012-09-25 21:11:03,295 INFO [mediagoblin.media_types.video.transcoders] Setting up thumbnailing pipeline

The skip_transcode code in mediagoblin/media_types/video/util.py fails with an error if a file does not have metadata tags.

/path/to/mediagoblin/mediagoblin/media_types/video/transcoders.py:34: PyGIWarning: GstPbutils was imported without specifying a version first. Use gi.require_version('GstPbutils', '1.0') before import to ensure that the right version gets loaded.
  from gi.repository import GObject, Gst, GstPbutils
DEBUG:mediagoblin.processing.task:Processing <MediaEntry 7016: Cartel para adopción>
ERROR:mediagoblin.processing.task:An unhandled exception was raised while processing <MediaEntry 7016: Cartel para adopción>
WARNING:mediagoblin.processing:No idea what happened here, but it failed: AttributeError("'NoneType' object has no attribute 'get_string'",)
WARNING:mediagoblin.processing:No idea what happened here, but it failed: AttributeError("'NoneType' object has no attribute 'get_string'",)
Traceback (most recent call last):
  File "bin/gmg", line 9, in <module>
    load_entry_point('mediagoblin', 'console_scripts', 'gmg')()
  File "/path/to/mediagoblin/mediagoblin/gmg_commands/__init__.py", line 142, in main_cli
    args.func(args)
  File "/path/to/mediagoblin/mediagoblin/gmg_commands/reprocess.py", line 293, in reprocess
    run(args)
  File "/path/to/mediagoblin/mediagoblin/gmg_commands/reprocess.py", line 205, in run
    reprocess_info=reprocess_request)
  File "/path/to/mediagoblin/mediagoblin/submit/lib.py", line 261, in run_process_media
    task_id=entry.queued_task_id)
  File "/path/to/mediagoblin/lib/python2.7/site-packages/celery-3.1.17-py2.7.egg/celery/app/task.py", line 547, in apply_async
    link=link, link_error=link_error, **options)
  File "/path/to/mediagoblin/lib/python2.7/site-packages/celery-3.1.17-py2.7.egg/celery/app/task.py", line 739, in apply
    request=request, propagate=throw)
  File "/path/to/mediagoblin/lib/python2.7/site-packages/celery-3.1.17-py2.7.egg/celery/app/trace.py", line 355, in eager_trace_task
    uuid, args, kwargs, request)
  File "/path/to/mediagoblin/lib/python2.7/site-packages/celery-3.1.17-py2.7.egg/celery/app/trace.py", line 253, in trace_task
    I, R, state, retval = on_error(task_request, exc, uuid)
  File "/path/to/mediagoblin/lib/python2.7/site-packages/celery-3.1.17-py2.7.egg/celery/app/trace.py", line 240, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/path/to/mediagoblin/mediagoblin/processing/task.py", line 101, in run
    processor.process(**reprocess_info)
  File "/path/to/mediagoblin/mediagoblin/media_types/video/processing.py", line 396, in process
    vp8_threads=vp8_threads, vorbis_quality=vorbis_quality)
  File "/path/to/mediagoblin/mediagoblin/media_types/video/processing.py", line 265, in transcode
    if skip_transcode(metadata, medium_size):
  File "/path/to/mediagoblin/mediagoblin/media_types/video/util.py", line 37, in skip_transcode
    if config['mime_types'] and tags.get_string('mimetype')[0]:
AttributeError: 'NoneType' object has no attribute 'get_string'

Here's a proposed fix. But I guess the question is, is it valid to have video with tag metadata? If not, then something else may be wrong (bad video file, or perhaps the wrong media type is trying to process the file).

diff --git a/mediagoblin/media_types/video/util.py b/mediagoblin/media_types/video/util.py
index d3d2927..e35b021 100644
--- a/mediagoblin/media_types/video/util.py
+++ b/mediagoblin/media_types/video/util.py
@@ -34,6 +34,9 @@ def skip_transcode(metadata, size):

     _log.debug('skip_transcode config: {0}'.format(config))
     tags = metadata.get_tags()
+    if not tags:
+        return False
+
     if config['mime_types'] and tags.get_string('mimetype')[0]:
         if not tags.get_string('mimetype')[1] in config['mime_types']:
             return False