Steps to reproduce:
Install the workflow "Extract to downloadable media" as optional MH component, following the instruction on http://opencast.jira.com/wiki/display/MHTRUNK/Export+Videos
Also check that Gstreamer (ver 0.10) is installed correctly.
To repeat the problem, use Upload media and select the "Extract to ..." workflow.
The processing will work correctly up to the Configure Export part, after which it will hang during the gstreamer processing pipeline without any error message.
Workaround (if any):