When surfing the web with my smartphone I noticed that when asking for a flash video file (flv) my mobile-browser would crash or just load forever while HTML5 movies worked fine. Flash isn't really perfect on mobile devices so I decided to create a script that could easily convert a flv file to an HTML5 video format like webm. The code atm won't work because I am trying to get rid of the bottleneck youtube-dl and to speed up ffmpeg.