Sothink Free Sothink FLV Player - Version 2.3.1 As an excellent Flash video player, Sothink FLV Player is totally free and small sized. It can easily play all video files with an FLV extension (*.flv), including those Flash videos encoded by Screen Video, Sorenson H. 263 and H.264, on2 vp6, etc. This flv player is so easy that users just need to double click flv files or drag and drop the flv files to the player¡¯s window, and then it instantly starts playing.