FFMpeg is a popular program for converting and manipulating audio/video files.

We will need to spin up a CentOS 6.4 x64 cloud server:

Step 1 - Install ATRPMS Repository

rpm --import http://packages.atrpms.net/RPM-GPG-KEY.atrpms
rpm -ivh http://dl.atrpms.net/el6-x86_64/atrpms/stable/atrpms-repo-6-7.el6.x86_64.rpm

Step 2 - Install FFMpeg from ATRPMS Repository

yum -y --enablerepo=atrpms install ffmpeg

Verify that you have FFMpeg installed:

ffmpeg -version

To get a list of supported formats:

ffmpeg -formats

Step 3 - Convert your Videos

Once you have uploaded your video you can begin converting it to various formats.

For our example, we will download "Big Buck Bunny 720p MP4" video and convert it.

wget "http://mirrorblender.top-ix.org/peach/bigbuckbunny_movies/big_buck_bunny_720p_surround.avi"

In 720p MP4 format this video is 317MB:

[root@FFMpeg ~]# ls -lah big_buck_bunny_720p_surround.avi 
-rw-r--r-- 1 root root 317M May  6  2008 big_buck_bunny_720p_surround.avi

Convert from MP4 to H264

ffmpeg -i big_buck_bunny_720p_surround.avi -vcodec libx264 big_buck_bunny_720p_surround-H264.avi

Once converted from MP4 to H264 this video is 118MB:

[root@FFMpeg ~]# ls -lah big_buck_bunny_720p_surround-H264.avi 
-rw-r--r-- 1 root root 118M May 30 23:40 big_buck_bunny_720p_surround-H264.avi

Convert from H264 to FLV

ffmpeg -i libx264 big_buck_bunny_720p_surround-H264.avi -vcodec libx264 -ar 44100 -f flv libx264 big_buck_bunny_720p_surround.flv

The FLV version is 102MB:

[root@FFMpeg ~]# ls -lah big_buck_bunny_720p_surround.flv 
-rw-r--r-- 1 root root 102M May 31 00:06 big_buck_bunny_720p_surround.flv

You can stream these files with JWPlayer as described in our next article.