Library Refresh issues 1.5.2 Pro

Please excuse me if this has been solved elsewhere in these forums. I've looked but not found an answer that works for me.
I have Serviio Pro 1.5.2 which has been running perfectly on Linux Mint 16.
I have copied my Serviio installation over to a fresh install of Mint 17.2 (with exactly the same media directories) and now the library does not refresh.
It showed and played existing media, but anything added after the fresh install would not show up.
I deleted and recreated all local shares in the Library tab and now nothing except empty folders will show.

Here is an excerpt from my debug log - it just seems to be a repeat of this over several pages of log files.

Any ideas?

2015-08-17 17:12:41,797 ERROR [ProcessExecutor] Fatal error in process starting: Cannot run program "ffmpeg": error=2, No such file or directory
java.io.IOException: Cannot run program "ffmpeg": error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
at org.serviio.external.ProcessExecutor.run(ProcessExecutor.java:135)
Caused by: java.io.IOException: error=2, No such file or directory
at java.lang.UNIXProcess.forkAndExec(Native Method)
at java.lang.UNIXProcess.<init>(UNIXProcess.java:248)
at java.lang.ProcessImpl.start(ProcessImpl.java:134)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
... 1 more
2015-08-17 17:12:41,797 WARN [ProcessExecutor] Cannot retrieve results, output reader is null
2015-08-17 17:12:41,798 WARN [MetadataExtractionCoordinator] Skipping processing metadata for an unsupported file (/media/disk-1/Sports-Vids/MOTOGP2014/MotoGP.2014x10.Indianapolis.Race/moto3.qualifying.mkv). Message: Unknown video file type.
2015-08-17 17:12:41,800 ERROR [ProcessExecutor] Fatal error in process starting: Cannot run program "ffmpeg": error=2, No such file or directory
java.io.IOException: Cannot run program "ffmpeg": error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
at org.serviio.external.ProcessExecutor.run(ProcessExecutor.java:135)
Caused by: java.io.IOException: error=2, No such file or directory
at java.lang.UNIXProcess.forkAndExec(Native Method)
at java.lang.UNIXProcess.<init>(UNIXProcess.java:248)
at java.lang.ProcessImpl.start(ProcessImpl.java:134)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
... 1 more

FFMPEG (or the lack of it) seems to have been the issue.
Mint 17 has all sorts of things in synaptic the 'use' ffmpeg but it doesn't actually have it installed - nor is it available in the standard repositories.

This is where I found my answer http://forums.linuxmint.com/viewtopic.p ... 1#p1047527