I messed with this a bit last night . Unfortunately , none of the sources I threw at it were very well parsed . For example , I converted a 20 minute long football coach ' s press conference video to a wav file . cut . py chunked this into 3200 files , but watson . py only managed to filter this into 310 usable snippets . Those snippets were not one word snips like I would have expected . The vast majority of them were long phrases . Stuff like that ' s one thing you ' re pregnant doesn ' t that which when listened to was actually that ' s one thing we were breaking new guys in in that pos . Only 40 snips were one word clips . I listened to each of the 40 . By my count , 13 of them were accurately recorded speechtotext . Admittedly , a press conference is a pretty noisy environment which I ' m sure contributed greatly to the poor showing .