Hi all, I followed the guide ​http://docs.mediagoblin.org/siteadmin/media-types.html#video to play videos, but when I try to load an mp4 video celeryd gives me this traceback

2013-06-21 08:35:06,303 INFO    [celery] Got task from broker: mediagoblin.processing.task.ProcessMedia[79d48707-aeee-46d7-85be-f26fc5f35ae7]
2013-06-21 08:35:13,030 WARNING [celery] Traceback (most recent call last):
2013-06-21 08:35:13,032 WARNING [celery] File "/media/LaCie/home/mediagoblin/thompson-mediagoblin-2.6/mediagoblin/media_types/video/transcoders.py", line 458, in __on_discovered
2013-06-21 08:35:13,063 WARNING [celery] raise Exception('Could not discover {0}'.format(self.source_path))
2013-06-21 08:35:13,065 WARNING [celery] Exception
2013-06-21 08:35:13,066 WARNING [celery] :
2013-06-21 08:35:13,068 WARNING [celery] Could not discover /home/mediagoblin/thompson-mediagoblin-2.6/user_dev/media/queue/media_entries/79d48707-aeee-46d7-85be-f26fc5f35ae7/Lolo__Show__Sulla_neve.mp4
2013-06-21 08:35:13,721 ERROR   [celery] Task mediagoblin.processing.task.ProcessMedia[79d48707-aeee-46d7-85be-f26fc5f35ae7] raised exception: TypeError("argument of type 'NoneType' is not iterable",)
Traceback (most recent call last):
  File "/media/LaCie/home/mediagoblin/thompson-mediagoblin-2.6/lib/python2.6/site-packages/celery-2.5.3-py2.6.egg/celery/execute/trace.py", line 181, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/media/LaCie/home/mediagoblin/thompson-mediagoblin-2.6/mediagoblin/processing/task.py", line 92, in run
    entry.media_manager.processor(proc_state)
  File "/media/LaCie/home/mediagoblin/thompson-mediagoblin-2.6/mediagoblin/media_types/video/processing.py", line 91, in process_video
    store_metadata(entry, metadata)
  File "/media/LaCie/home/mediagoblin/thompson-mediagoblin-2.6/mediagoblin/media_types/video/processing.py", line 170, in store_metadata
    if key in metadata])
TypeError: argument of type 'NoneType' is not iterable

I'm currently using mediagoblin 0.4.1.dev in the thompson 421-mysql branch.

Hi

It is possible to upload successfully a 3GP file, I get a confirmation message when it is done. However, the transformation fails, it appears in the subsection for failed additions but with no value in the fields "Reason for failure" and "Failure metadata". If you don't plan to support this format, please fill these fields.

The player doesn't start playing the video under Mageia Linux 2 in the web browser Mozilla Firefox 17 ESR whereas I can watch this video with VLC. I use the desktop manager KDE and then Dragon Player is used inside the web browser to play the video by default.