When uploading a video, no thumbnail is created.

Celery output (debug mode):

2013-06-11 16:54:11,706 INFO    [celery] Got task from broker: mediagoblin.processing.task.ProcessMedia[c78040c7-7c09-4ab8-a4e0-01e4088dfaf7]
2013-06-11 16:55:05,639 WARNING [celery] /var/www/mediagoblin/VIRTUAL/local/lib/python2.7/site-packages/SQLAlchemy-0.8.1-py2.7-linux-x86_64.egg/sqlalchemy/engine/default.py:471: SAWarning: Unicode type received non-unicode bind param value.
  processors[key](compiled_params[key])
2013-06-11 16:55:05,826 WARNING [celery] /var/www/mediagoblin/mediagoblin/media_types/video/transcoders.py:237: DeprecationWarning: integer argument expected, got float
  0)
2013-06-11 16:55:06,157 INFO    [celery] Task mediagoblin.processing.task.ProcessMedia[c78040c7-7c09-4ab8-a4e0-01e4088dfaf7] succeeded in 54.4011001587s: None

I'm using current master (25aad338d4921ec76484c6d2af5e40c97904917d).

I have made the Simplified Chinese translation for MediaGoblin. I will attach the .po here.

I have not gotten my .po file reviewed. If anyone can help, please check whether there is any syntax errors or other mistakes.

By default in the mediagoblin.ini file is written also the media type video. But it is not specified that you have to go here ​http://docs.mediagoblin.org/siteadmin/media-types.html#video

to install the additional dependencies for the video processing.