MH-8100 WaveFormOperationHandler more verbose if fail


git-svn-id: https://opencast.jira.com/svn/MH/branches/MH-8100@14786 e6edf6fb-f266-4316-afb4-e53d95876a76
MH-8100 Corrected initial segmentation

git-svn-id: https://opencast.jira.com/svn/MH/branches/MH-8100@14787 e6edf6fb-f266-4316-afb4-e53d95876a76