There is no ffmpeg package in Ubuntu 14.04 LTS Trusty Tahr.
You're trying to install ffmpeg 4:0.5.9-0ubuntu0.10.04.3 from Ubuntu
10.04 LTS Lucid Lynx in trusty, so you should expect problems.
This problem does not exist in the ffmpeg package in Ubuntu 15.04 Vivid
Vervet.
Thus this bug is
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1458359
Title:
package ffmpeg (not installed) failed to install/upgrade: trying to
overwrite
