I wrote a post a little while back explaining how to use the built-in screencast tool on Fedora 20.
I’ve just noticed that the latest Fedora release (21) limits the screencast length to 30 seconds.
It’s okay. If you want to record for longer than 30 seconds, you can change the time using gsettings.
View the existing time with:
gsettings get org.gnome.settings-daemon.plugins.media-keys max-screencast-length
And set a new time (0 for unlimited) with:
gsettings set org.gnome.settings-daemon.plugins.media-keys max-screencast-lenth
Nice and easy 🙂