Can't install ffmpeg in Fedora 19 via yum
Solution 1:
even 20 days ago 19 is well past EoL so the repos you are attempting to pull off of are dead.
Update: (2017-12-18) On 25 thru 27 the method you are using WILL work as those repos are still active. But you can also just use normal repos and rpmfusion repos for the extra stuff with licensing issues. https://rpmfusion.org/Configuration . Once youbhave rpmfusion installed you can do most anything you'll need with ffmpeg and similar.