YouTube has a lot of interesting videos that can be used for entertainment or learning. If I were an English teacher, I would think that some of these videos could be used as materials for listening or spoken language classes. However, YouTube itself does not provide a video download service; it uses the FLV format, which requires FLV Player for playback (apparently, the latest version of Fengstorm Player can also play it). Below, we will explore the downloading of YouTube videos, local playback, and format conversion.