Acetoneiso fails to convert flv to avi (missing mencoder)

[SB]

Acetoneiso fails to convert flv to avi, reports that mencoder is missing.

"Unable to find mencoder in /usr/bin.

Please install it and be sure it's linked to /usr/bin folder."

Steps to reproduce:

1-Open Acetoneiso
2-Select Video-Convert FLV 2 AVI

You will get the error about missing mencoder.

Attempting to install mencoder reports the following:

"Package mencoder is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'mencoder' has no installation candidate"

Ubuntu 15.04 64-bit fully updated.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: acetoneiso 2.4-2
ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
Uname: Linux 3.19.0-16-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Tue May 12 10:32:33 2015
InstallationDate: Installed on 2015-03-16 (56 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150306)
SourcePackage: acetoneiso
UpgradeStatus: No upgrade log present (probably fresh install)