MH-8100 fixed: player only played 2s after pressing shortcut n

git-svn-id: http://opencast.jira.com/svn/MH/branches/MH-8100@13730 e6edf6fb-f266-4316-afb4-e53d95876a76
MH-8100 refactoring #2

git-svn-id: http://opencast.jira.com/svn/MH/branches/MH-8100@13731 e6edf6fb-f266-4316-afb4-e53d95876a76