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

sudo dnf install$(rpm -E %fedora).noarch.rpm$(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.