What application did you open it with?
Edit: Ok I probably know what the problem is... Add the Motumedia repository
Code:
sudo add-apt-repository ppa:motumedia/mplayer-daily
And install -
Code:
sudo apt-get install x264
Or you can do this...
Code:
git clone --depth 1
git://git.videolan.org/x264.git
cd x264
./configure --enable-static
make
sudo checkinstall --pkgname=x264 --pkgversion="3:$(./version.sh | \
awk -F'[" ]' '/POINT/{print $4"+git"$5}')" --backup=no --deldoc=yes \
--fstrans=no --default
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