Transcoding speed depends on the file and your CPU (mostly). What kind of CPU do you have?

It's also possible that transcoding fails with the file that you got the "corrupt" message for. Please turn on logging (see this thread: http://forum.conceiva.com/showthread...nostic-logging) then try to play that file again and once you receive the error, stop the server and send the logs to support (at) conceiva (dot) com

A future version of Mezzmo will show you which files are being transcoded and which are done, so you'll know exactly what's happening.