All of the above codecs/plug-ins are very useful to install. Handbrake is a open source transcoder that converts stuff for you. Some of the films are heavily compressed and fast to download, and some are bigger in size with higher quality. If you experience "stuttering", just stop the movie and wait for a few seconds/minutes so the download is ahead of the playhead. Good internet connection is preferred.

If you prefer movies that play in Quicktime, just click to start the movie of your choice, copy the address in the internet address field, open quicktime, go to the archive menu and choose open URL. Paste the address. In Quicktime you can scale and export movie to your preferred destination to watch offline.
If you prefer to watch movies on your smartphone, please click the iPhone on the left or the movies for handheld section.