ffmpeg: error while loading shared libraries: libass.so.4 after upgrading system

Case

Ubuntu 14.04 running compiled ffmpeg using the directions specified on their website. Upgraded the system to 14.10. This brought a number of updates and also upgraded older libraries to newer versions. After the upgrade, running `ffmpeg` on the terminal gave the following error.

Investigation:

The solution:

Found on #ffmpeg @ freenode IRC :

abi changed. recompile