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Install the RPM Fusion repositories both free and non-free for your Fedora 25 distribution:

sudo dnf install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm https://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm

Then update and install your packages:

sudo dnf update
sudo dnf install ffmpeg mkv

ffmpeg and mkv are non-free packages and they are not present in the default Fedora repo.