man trenger ikke skript og man bruker avconv (som erstatter ffmpeg):

Packaging

The Debian/Ubuntu packager is on Libav side (see by the way the distribution status on their site), and obviously they distribute Libav packages. But they are also using this to spread a very destructive lie:

ffmpeg version 0.8.3-6:0.8.3-4, Copyright (c) 2000-2012 the Libav developers
built on Jun 26 2012 09:26:41 with gcc 4.7.1
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
[...]
This is obviously false, and even more wrong in the sense that they are still using the "ffmpeg" name for the package. It looks like it's been "fixed" on Ubuntu but it's still present on Debian here.

This propaganda certainly hurts the FFmpeg project a lot.

Note: FFmpeg is providing ff* tools, fully compatible with the av* tools from Libav (avconv, avplay, ...), with additional features, bug fixes, but also backward compatibility for some options Libav decided to remove.

For a while both Libav and FFmpeg separately developed their own versions of ffmpeg.
Libav then renamed their bizarro ffmpeg to avconv to distance themselves from the FFmpeg project.
During the transition period the message you see was displayed to tell users to start using avconv instead their version of ffmpeg.
This confuses some users into thinking that FFmpeg (the project) is dead, which is not true.
Unfortunate wording, but I can't imagine Libav not expecting such a response by general users.