I just noticed that with ogmrip you can only rip DVD's but not rip single videofiles. So this program probably doesn't fit your needs.
to install ffmpeg, ffmpeg2theora you first have to install the rpmfusion repos
rpm -Uvh http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm
Then install these packages via yum.
yum install ffmpeg ffmpeg2theora
If you want to try out handbrake you can download it here
. To install it use "rpm -ivh HandBrake*.rpm" from the place where you saved this rpm package.
The Arista website is here
, but if you don't have experience with compiling of programs you maybe better try the alternatives first.
a short example how you could use ffmpeg2theora:
ffmpeg2theora -x 768 -y 432 -v 7 -a 0 --optimize 'inputfile.mp4' -o 'outputfile.ogv'
But in this example you have first to cd to the path where the videofile inputfile.mp4 is stored, e.g. if it's in /home/user/Videos then "cd /home/user/Videos". To see the different options of ffmpeg2theora use "ffmpeg2theora --help"