Install ffmpeg on Amazon AMI

ffmpeg

As Amazon AMI is a subset of Redhat so most of the tutorials will turn you to `yum` by adding or configuring some repo config file which those repo is old and tutorials are no longer valid.

To make it super easy, I would recommend you to use a static build of `ffmpeg` which you can find it at:
http://johnvansickle.com/ffmpeg/

Get a latest stable release version (the 3rd or 4th line e.g. 2.5 at the moment of writing) not the 1st - 2nd line which is considerable as a unreleased build and maybe unstable.  You can go ahead and copy a download link which correct to your machine CPU architecture e.g. 64bits

After that `ssh` to your Amazon EC2 and do:

```
cd ~/
wget <package link>
tar xf <package name>.xz
cd <package name + version>
(You should see ffmpeg in here along with other builds)
sudo cp ffmpeg /usr/local/bin
```

Now try run `ffmpeg` and you should be able to convert any VDO!  Without build it or having a hard time to figure out how to install it with `yum`

Please note that, this is an easiest way not the best way (e.g. build it by yourself on host machine)