FFMPEG Not Found

Hello, I am having problems with Serviio 1.6. In the log file there is an error, Serviio cannot find FFMPEG even though it is installed and can be run from the command prompt.

I am using Synology DS1512+.

Log file:
2016-03-30 23:47:54,782 ERROR [MediaServer] FFMPEG not found. Serviio will not work properly.

Does anyone know how to fix this?

[~] # find -name ffmpeg
./usr/bin/ffmpeg
./volume1/@appstore/MediaServer/bin/ffmpeg
./volume1/@appstore/MediaServer/lib/ffmpeg
./volume1/@appstore/SurveillanceStation/bin/ffmpeg
./volume1/@appstore/SurveillanceStation/lib/ffmpeg
./volume1/@appstore/VideoStation/apparmor/abstractions.pkg/VideoStation/ffmpeg
./volume1/@appstore/VideoStation/bin/ffmpeg
./volume1/@appstore/VideoStation/lib/ffmpeg
./volume1/@appstore/Serviio/bin/ffmpeg


[~] # echo $PATH
/opt/bin:/opt/sbin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/syno/sbin:/usr/syno/bin:/usr/local/sbin:/usr/local/bin:/volume1/@appstore/java8/ejdk1.8.0_77/linux_i586/jre/bin:/volume1/@appstore/java8/ejdk1.8.0_77/linux_i586/jre/bin

Thank you for your help.