aptget "myfile" isn't gonna work

My file is nearly a shellscript wich makes use of other programs.
You need mplayer and the mjpegtoolspackage, so aptget mplayer would be more apropiate, but most likely mplayer is already installed, you only need the mjpegtoolspackage.
Download the mkxvcd-version.tar.gz into your homedir, open a shell and do
tar -xvzf mkxvcd-version.tar.gz and you end up with a directory with that name containing the script (and some other files to read). So do
cd mkxvcd-version, make yourself superuser with
su and copy the script to a logical place like /usr/bin or /usr/local/bin with
cp mkxvcd.sh /usr/bin
Then you can go back to normal user with
exit and
cd back to your homedir.
Now start the script with
mkxvcd.sh path/to/youfile.avi and with a bit of luck you end up with a kvcd mpeg.