After an update to VIMP 3.2.0 it´s possible that you don´t see Backend -> configuration -> Transcoding settings completely.
Also transcoding fails with this message in the transcoding Logfile log/framework.conviert.log:
+ specified transcoder undefined
In that case please execute the following command on your VIMP database:
DELETE FROM DBNAME.config WHERE config.setting = 'transcoding_transcoder';